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Mototaka Arakawa

Section

Graduate School of Biomedical Engineering

Job title

Associate Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/read0055279

J-GLOBAL ID

200901066448005894

Committee Memberships 19

日本超音波医学会　理事

2024/06 - Present
超音波エレクトロニクスの基礎と応用に関するシンポジウム論文委員会　委員

2024/04 - Present
IEEE Ultrasonics Symposium, Technical Program Committe　Member

2024/04 - Present
日本音響学会　東北支部幹事

2024/04 - Present
電子情報通信学会和文論文誌C編集委員会　和文論文誌編集委員

2023/06 - Present
日本音響学会編集委員会論文部会　委員

2023/06 - Present
電子情報通信学会超音波研究専門委員会　専門委員

2022/06 - Present
日本超音波医学会東北地方会　幹事（基礎）

2022/04 - Present
日本音響学会　代議員

2021/05 - Present
日本超音波医学会　代議員

2020/06 - Present
日本超音波医学会東北地方会　運営委員

2018/04 - Present
超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会　運営委員

2010/04 - Present
日本音響学会東北支部　顧問

2023/04 - 2024/03
電子情報通信学会超音波研究専門委員会　幹事

2020/06 - 2022/06
日本音響学会東北支部　幹事

2018/04 - 2022/03
電子情報通信学会超音波研究専門委員会　幹事補佐

2019/06 - 2020/06
超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会　現地実行委員

2017/04 - 2018/03
超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会　実行委員

2009/04 - 2010/03
日本音響学会　東北支部幹事

2004/04 - 2010/03

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Professional Memberships 4

Institute of Electronics, Information and Communication Engineers

2020/11 - Present
The Japan Society of Ultrasonics in Medicine
The Institute of Electrical an Electronics Engineers, Inc.
Acoustical Society of Japan

Research Interests 7

blood property
動脈硬化症
医用超音波工学
Viscoelasticity
Acoustic Property
Ultrasonic Micro-Spectroscopy
Ultra-Precise Ultrasonic Measurement

Research Areas 2

Life sciences / Biomedical engineering /
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Measurement engineering / Measurements and Instrumentation

Awards 9

Best Paper Award of USE2022

2023/11　超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会
貢献賞（研究専門委員会運営）

2022/09　電子情報通信学会基礎・境界ソサイエティ
36th Kikuchi Award (The japan Society of Ultrasonics in Medicine)

2022/05　The japan Society of Ultrasonics in Medicine　Low-complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming
第9回（2021年度）学会活動貢献賞

2022/03　日本音響学会
35th Kikuchi Award (The japan Society of Ultrasonics in Medicine)

2021/05　The japan Society of Ultrasonics in Medicine　Discrimination of thoracic spine from muscle based on their difference in ultrasound reflection and scattering characteristics
石田（實）記念財団研究奨励賞

2009/10/30　石田（實）記念財団　次世代超低膨張ガラスのゼロCTE温度評価法に関する研究
第29回JJAP論文賞

2007/09/04　応用物理学会
超音波シンポジウム論文賞

2005/11/17　超音波シンポジウム運営委員会
第21回粟屋潔学術奨励賞

2004/03/18　社団法人日本音響学会　2003年春季研究発表会講演

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Papers 164

Estimation of red blood cell aggregation size using power spectrum considering density of red blood cells in focal region

Rina Takeyama, Shohei Mori, Nobuo Masauzi, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi KANAI

Japanese Journal of Applied Physics　2024/05/07
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/ad47fe 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract We have studied a noninvasive and quantitative method for measuring the aggregate size of red blood cells (RBCs). In our previous study, the scattering power spectrum obtained from the vascular lumen was fitted to the reference scattering spectra calculated from the scattering spectrum of a single-sphere scatterer. In this paper, we propose a method for calculating the reference scattering spectra by summing the scattering spectra for numerous scatterers in the ultrasound focal region. By applying this method to the size estimation of microparticles simulating RBC aggregates, the estimated sizes are found to be close to the true values. In in vivo measurements, the estimated sizes at rest are equivalent to the size of a single sphere with the same volume as an RBC, and those during avascularization are larger than those at rest, which is reasonable. The proposed method has the potential to accurately estimate the size of RBC aggregates.
Influence of Power-Weighted Center of Echo Signal Within Window Function on Local Strain Rate Distribution in Left Ventricular Wall

Yu Obara, Shohei Mori, Masumi Iwai-Takano, Mototaka Arakawa, Hiroshi Kanai

Ultrasound in Medicine & Biology　50　(5)　768-774　2024/05
Publisher: Elsevier BV
DOI： 10.1016/j.ultrasmedbio.2024.01.014 　

ISSN： 0301-5629
Appropriate indicator of modeling error for threshold-based model selection in statistics-based ultrasound tissue characterization

Shohei Mori, Mototaka Arakawa, Tadashi Yamaguchi, Hiroshi Kanai, Hiroyuki Hachiya

Japanese Journal of Applied Physics　63　(5)　05SP03-05SP03　2024/05/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/ad3653 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract Analysis of the envelope statistics of ultrasound echo signals contributes to quantitative tissue characterization in medical ultrasound. Many probability distribution model functions have been studied, and the model function that should be used for tissue characterization depends on the type of disease, even in the same organ. Thus, an appropriate model selection is important for an accurate diagnosis. In this study, we aimed to select a model using threshold processing for modeling errors instead of a simple selection by minimizing the modeling error. For this purpose, we compared several indicators of modeling errors using random number simulations, ultrasonic simulation, and phantom experiment. The results validated that the Mahalanobis distance of moments is an appropriate indicator because it enables the use of a constant threshold value, regardless of the type of model function and data length.
Method for measuring time waveforms of minute sinusoidal displacements using continuous waves with a network analyzer

Yuya Komatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　63　(4)　048003-048003　2024/04/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/ad3655 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract This study proposes a method for precise measurement of time waveforms of minute sinusoidal displacements using continuous waves. The technique involves measuring the S-parameter of ultrasonic waves reflected from an object undergoing sinusoidal vibration with a network analyzer. When the sinusoidal displacement is not sufficiently small, second-order side peaks emerge in its inverse Fourier transform, alongside the main and first-order side peaks. This method, which incorporates second-order side peaks previously overlooked, enhances the accuracy of measurements. It facilitates precise measurement of sinusoidal displacements ranging from 0.3 to 50 μm at frequencies between 10 and 300 Hz.
A novel ultrasonic method for measuring minute sinusoidal displacement by network analyzer

Yuya Komatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Review of Scientific Instruments　95　(2)　2024/02/01
Publisher: AIP Publishing
DOI： 10.1063/5.0177846 　

ISSN： 0034-6748

eISSN： 1089-7623

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We developed a method for generating continuous sinusoidal displacements of an object to estimate viscoelastic parameters. However, the amplitude of the displacement caused by the ultrasonic excitation force under safe guidelines was small (a few micrometers), and it was difficult to stably measure the displacement. Therefore, to stably measure the amplitude of sinusoidal displacement as small as the order of micrometers, we proposed a novel method using a network analyzer. Ultrasonic waves were irradiated using an ultrasonic transducer to an object vibrating sinusoidally. The S parameter of the first reflected wave received from the surface of the object was measured using a network analyzer. The S parameter and the inverse Fourier transform were formulated theoretically, and the amplitude of the sinusoidal displacement of the object was estimated from the amplitude characteristics of the inverse Fourier-transformed signal. The proposed method was applied to measure sinusoidal displacements on the order of micrometers from 10 to 300 Hz on an object using a water tank experiment. The obtained sinusoidal displacement agreed well with the reference values measured using a laser displacement meter. The proposed method can accurately measure minute sinusoidal displacements that occur on an object.
Automated mode chart generation for finite element analysis of piezoelectric resonators using principal component analysis based on clustering

Kenji Inoue, Yuji Ohashi, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　2024/01/01

DOI： 10.35848/1347-4065/ad12f0 　
Optimizing irradiation conditions for low-intensity pulsed ultrasound to upregulate endothelial nitric oxide synthase.

Daiki Ouchi, Shohei Mori, Mototaka Arakawa, Tomohiko Shindo, Hiroaki Shimokawa, Satoshi Yasuda, Hiroshi Kanai

Journal of medical ultrasonics (2001)　2023/12/05

DOI： 10.1007/s10396-023-01382-z 　

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PURPOSE: Here we aimed to develop a minimally invasive treatment for ischemic heart disease and demonstrate that low-intensity pulsed ultrasound (LIPUS) therapy improves myocardial ischemia by promoting myocardial angiogenesis in a porcine model of chronic myocardial ischemia. Studies to date determined the optimal treatment conditions within the range of settings available with existing ultrasound equipment and did not investigate a wider range of conditions. METHODS: We investigated a broad range of five parameters associated with ultrasound irradiation conditions that promote expression of endothelial nitric oxide synthase (eNOS), a key molecule that promotes angiogenesis in human coronary artery endothelial cells (HCAEC). RESULTS: Suboptimal irradiation conditions included 1-MHz ultrasound frequency, 500-kPa sound pressure, 20-min total irradiation time, 32-48-[Formula: see text] pulse duration, and 320-[Formula: see text] pulse repetition time. Furthermore, a proposed index, [Formula: see text], calculated as the product of power and the total number of irradiation cycles applied to cells using LIPUS, uniformly revealed the experimental eNOS expression associated with the various values of five parameters under different irradiation conditions. CONCLUSION: We determined the suboptimal ultrasound irradiation conditions for promoting eNOS expression in HCAEC.
Estimation error in speed of sound caused by rotation of measured cross-section from short-axis plane of blood vessels: a preliminary study.

Shohei Mori, Keiji Onoda, Mototaka Arakawa, Hiroshi Kanai

Journal of medical ultrasonics (2001)　2023/11/30

DOI： 10.1007/s10396-023-01383-y 　

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PURPOSE: Estimating the speed of sound (SoS) in ultrasound propagation media is important for improving the quality of B-mode images and for quantitative tissue characterization. We have been studying a method for estimating the SoS by measuring the reception time distribution of waves scattered from a scatterer at the elements in a probe. Previously, the measurement cross section was assumed to be perpendicular to the long axis of the blood vessel. In this study, we experimentally investigated the relationship between rotation angle [Formula: see text] of the probe relative to the short-axis plane of the blood vessel and the estimated SoS, [Formula: see text]. METHODS: Water tank and phantom experiments were conducted to investigate the characteristics of [Formula: see text] and element signals when the probe was rotated. RESULTS: The received signal powers at the elements around both edges greatly decreased as [Formula: see text] increased. We introduced a parameter representing the decrease in power, [Formula: see text], in the received signal at the elements at both edges relative to the center element. [Formula: see text] was estimated to be larger as [Formula: see text] increased, especially for [Formula: see text]. [Formula: see text] also increased as [Formula: see text] increased. An approximately proportional relationship existed between the errors in [Formula: see text] and [Formula: see text]. CONCLUSION: Based on these results, we can distinguish between the presence and the absence of SoS misestimations using the difference in power among the elements in the received signal. In the absence of misestimation, we can obtain the true SoS, even if the target has a non-negligible size, by applying our previously proposed methods.
Quantification of limitations in statistical analysis of ultrasound echo envelope amplitudes

Shohei Mori, Mototaka Arakawa, Hiroshi Kanai, Hiroyuki Hachiya

Japanese Journal of Applied Physics　62　(SJ)　SJ1045-SJ1045　2023/04/12
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acc33e 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract Ultrasound echo envelope statistics have been widely studied for quantitative tissue characterization. In ultrasound measurements, the size of the region-of-interest (ROI) is limited by several factors, such as the locality of the tissue characteristics and the depth dependence of the acoustic field of the ultrasound beam. In this case, the evaluated echo envelope statistics vary even when the envelope amplitudes follow the same population without any noise. In this study, the statistical variance of the moments caused by this finite number of samples was quantified based on the central limit theorem and the law of error propagation. The proposed principles were validated by random number simulation and used to quantify the statistical variance of Nakagami parameter estimation. Finally, the effective number of independent samples in an ultrasonic measurement was quantified based on the relationship between the ROI size and the ultrasound spatial resolution.
Ultrasonic measurement of carotid luminal surface roughness with removal of axial displacement caused by blood pulsation

Ryota Yamane, Shohei Mori, Mototaka Arakawa, Jens E. Wilhjelm, Hiroshi Kanai

Japanese Journal of Applied Physics　62　(SJ)　SJ1042-SJ1042　2023/04/03
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acc07a 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract For early diagnosis of atherosclerosis, we have developed a method to measure the initial minute surface roughness utilizing the natural longitudinal displacement of the intima-media-complex (IMC) on the carotid artery caused by pulsation. However, the IMC displaces not only in the longitudinal direction but also in the axial direction due to the pulsation. In the present paper, we proposed a novel method to remove the pulsation component by spatially convolving a high-pass filter with the measured depths of IMC in the longitudinal direction. The proposed method was validated by a phantom experiment, and the surface roughness with ten saw teeth was correctly measured. Next, the surface roughness of the carotid artery wall was measured for two healthy volunteers. The proposed method reduced the variation of measured surface roughness among beams compared to the previous method.
High-speed measurement of two-dimensional displacement of myocardium using element RF data of ultrasonic probe

Kaisei Hara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　62　(SJ)　SJ1040-SJ1040　2023/03/27
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acc112 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract Improving the accuracy of heart wall motion measurement is essential to realise better cardiac function evaluation. This paper proposed a two-dimensional (2D) displacement estimation method with a high temporal resolution using the 2D complex cross-correlation of element RF signals of an ultrasonic probe between frames returned from the target scatterers. The application of the proposed method to the phantom displacement confirmed its principle. The estimated 2D displacement of the phantom was consistent with the set displacement. Subsequently, the method was applied to two healthy subjects to measure the 2D displacement of the interventricular septum during one cardiac cycle. Consequently, during systole and diastole, the movement of the myocardium was measured, and the results were validated.
Internal pressure dependence on viscoelasticity of arterial wall by ultrasonic measurement

Saki Suzuki, Shohei Mori, Masumi Iwai-Takano, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　62　(SJ)　SJ1041-SJ1041　2023/03/27
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acbf5d 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract Previously, we proposed an ultrasonic measurement method of arterial wall elasticity for the early detection of arteriosclerosis. Since vascular wall elasticity depends on blood pressure, in this study, the elasticity and viscosity were estimated using the hysteresis loop determined between the incremental strain in the wall and internal pressure by altering the internal pressure in the phantom and in vivo experiments. Consequently, both the estimated elasticity and viscosity increased with the internal pressure. Moreover, the slope of each hysteresis loop was larger than that of the approximated curve for the lowest blood pressures of the hysteresis loops with different internal pressures, as the blood pressure changed in the order of several hertz within a single heartbeat. Hence, we conclude that measuring both the blood pressure and the elastic and viscous moduli would be beneficial in comprehensively investigating more vessel wall properties that change with the progression of arteriosclerosis.
Ultrasonic measurement of thickness of carotid arterial wall using its natural longitudinal displacement

Yoshifumi Nagai, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　62　(SJ)　SJ1039-SJ1039　2023/03/21
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acba26 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract The thickness of the carotid arterial wall obtained from B-mode imaging using ultrasonic diagnostic devices is widely used for the diagnosis of atherosclerosis. However, the measurement interval in the lateral direction of the B-mode image depended on the beam interval (>100 μm). Therefore, the B-mode image is discrete in the lateral direction and cannot reflect changes in local and minute thicknesses. A method for measuring the roughness of the luminal surface of the wall was proposed using the displacement of the carotid arterial wall in the lateral direction during one heartbeat. In this method, the lateral measurement interval is much shorter than the beam interval, enabling a smooth measurement of the luminal surface. By simultaneously applying the method to the lumen-intima and medial-adventitia boundaries of the wall, we propose a novel method to measure the local and minute thicknesses of the carotid arterial wall.
Speed-of-sound estimation in ultrasound propagation medium by considering size of target scatterer

Shohei Mori, Hiroshi Kanai, Mototaka Arakawa

Journal of Medical Ultrasonics　2023/03/11
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10396-023-01282-2 　

ISSN： 1346-4523

eISSN： 1613-2254
Lateral M-Mode: Ultrasound Visualization of Displacement Along Longitudinal Direction at Intima-Media Complex. International-journal

Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Ultrasound in medicine & biology　49　(3)　875-888　2023/03

DOI： 10.1016/j.ultrasmedbio.2022.11.014 　

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Quantification of the dynamics of the carotid artery wall is useful in evaluating arteriosclerosis and atherosclerosis. As the carotid artery wall moves not only in the radial direction but also in the longitudinal direction, longitudinal movement should be considered in the analysis of the dynamic properties of the carotid artery wall. In this study, we propose a "lateral M-mode" method for visualizing the longitudinal movement of the intima-media complex (IMC). For the lateral M-mode, we set the target line in the longitudinal direction along the IMC and visualize the signals on the target line frame-by-frame by correcting the position of the target line along the radial displacement estimated by the phased tracking method. Differentiating the envelope signals between consecutive ultrasound beams was effective in visualizing the lateral movement of the IMC. The precision of the longitudinal displacement of the IMC estimated using the conventional block-matching method was validated by comparing it with the lateral M-mode. Because the conventional M-mode sequence plays an important role in evaluation of the dynamics of various tissues, the proposed "lateral M-mode" contributes to a detailed understanding of vascular dynamics and the development of diagnostic methods for vascular diseases.
In vivo measurement of attenuation coefficient of blood in a dorsal hand vein in a frequency range of 10–45 MHz: A preliminary study

Mototaka Arakawa, Kyohei Higashiyama, Shohei Mori, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

Frontiers in Physics　11　2023/02/07
Publisher: Frontiers Media SA
DOI： 10.3389/fphy.2023.1077696 　

eISSN： 2296-424X

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In this study, the attenuation coefficient of blood was measured in vivo in the frequency range of 10–45 MHz. A procedure to correct the distribution of sound pressure in the measurements was discussed. Further, in vivo measurements were applied on the dorsal hand vein of four healthy subjects at rest and during avascularization. As a preliminary result, less variation of the measured attenuation coefficients was achieved by the proposed method. The comparable results of the inclination of the attenuation coefficients were obtained at rest and during avascularization. Furthermore, the attenuation coefficients during avascularization were markedly higher than those at rest, reflecting the degree of red blood cell aggregation promoted by avascularization. This method may aid in the non-invasive evaluation of blood properties reflecting the degree of red blood cell aggregation.
Application of low-complexity generalized coherence factor to in vivo data

Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Journal of Medical Ultrasonics　2022/08/30
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10396-022-01243-1 　

ISSN： 1346-4523

eISSN： 1613-2254
Evaluation of local changes in radio-frequency signal waveform and brightness caused by vessel dilatation for ascertaining reliability of elasticity estimation inside heterogeneous plaque: a preliminary study

Yuta Haji, Shohei Mori, Mototaka Arakawa, Toshio Yamagishi, Hiroshi Kanai

Journal of Medical Ultrasonics　2022/07/16
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10396-022-01229-z 　

ISSN： 1346-4523

eISSN： 1613-2254
Accurate measurement of elasticity of the radial artery wall considering changes in cross-sectional shape of artery caused by pushing pressure applied by ultrasound probe

Yuto Shoji, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

Japanese Journal of Applied Physics　61　(SG)　2022/07/01

DOI： 10.35848/1347-4065/ac4e4a 　

ISSN： 0021-4922

eISSN： 1347-4065
Transmission conditions for clear depiction of thoracic spine based on difference between reflection and scattering characteristics of medical ultrasound

Taiga Bando, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

Japanese Journal of Applied Physics　61　(SG)　2022/07/01

DOI： 10.35848/1347-4065/ac51c0 　

ISSN： 0021-4922

eISSN： 1347-4065
Improving axial resolution of medical ultrasound images by using noise-robust broadband filter based on singular value decomposition

Kenta Kawamata, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　61　(SG)　2022/07/01

DOI： 10.35848/1347-4065/ac5a2c 　

ISSN： 0021-4922

eISSN： 1347-4065
Estimation of aggregate size of red blood cell by introducing reference power spectrum measured for hemispherical ultrafine wire

Kyohei Higashiyama, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

Japanese Journal of Applied Physics　61　(SG)　2022/07/01

DOI： 10.35848/1347-4065/ac4683 　

ISSN： 0021-4922

eISSN： 1347-4065
光音響・高周波超音波東北大学における光音響/高周波超音波イメージング

西條芳文, 新楯諒, 鈴木陸, 石井琢郎, 荒川元孝, 梅村晋一郎, 吉澤晋, 長岡亮, 小林和人, 根本隆治

超音波医学　49　(Suppl.)　S522-S522　2022/04
Publisher: (公社)日本超音波医学会
ISSN： 1346-1176

eISSN： 1881-9311
Appropriate Window Function and Window Length in Multifrequency Velocity Estimator for Rapid Motion and Locality of Layered Myocardium. International-journal

Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

IEEE transactions on ultrasonics, ferroelectrics, and frequency control　69　(4)　1353-1369　2022/04

DOI： 10.1109/TUFFC.2022.3153048 　

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The heart wall has a multilayered structure and moves rapidly during ejection and rapid filling periods. Local strain rate (SR) measurements of each myocardial layer can contribute to accurate and sensitive evaluations of myocardial function. However, ultrasound-based velocity estimators using a single-frequency phase difference cannot realize these measurements owing to insufficient maximum detectable velocity, which is limited by a quadrature frequency. We previously proposed a velocity estimator using multifrequency phase differences to improve the maximum detectable velocity. However, the improvement is affected by a spatial discrete Fourier transform (DFT) window length that represents the locality of the velocity estimation. In this article, we theoretically describe that shortening the window increases the interference between different frequency components and decreases the maximum detectable velocity. The tradeoff between the maximum detectable velocity and the window length was confirmed through simulations and a water-tank experiment. Under the tradeoff, the Hanning window, which was used in previous studies, is not always appropriate for the local measurement of the velocity, which sometimes exceeds 100 mm [Formula: see text] depending on the subject, direction of the ultrasound beam to the heart wall, and cardiac periods. In the in vivo measurement with the short window, the Tukey window with a large flat part that has a high-frequency resolution and ameliorates the discontinuity at both edges of the windowed signal was appropriate to measure the maximum velocity. This study offers the potential for local measurements of each myocardial layer using the multifrequency velocity estimator with the appropriate window function and window length.
骨と筋組織の超音波の反射特性と散乱特性の差異に基づく胸椎の描出

横山智大, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

超音波医学　49　(2)　141-149　2022/03
Publisher: (公社)日本超音波医学会
ISSN： 1346-1176

eISSN： 1881-9311
Low-complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming

Masanori HISATSU, Shohei MORI, Mototaka ARAKAWA, Hiroshi KANAI

Choonpa Igaku　49　(6)　503-516　2022
Publisher: Japan Society of Ultrasonics in Medicine
DOI： 10.3179/jjmu.jjmu.k.27 　

ISSN： 1346-1176

eISSN： 1881-9311
A Novel Method for Depicting Thoracic Spine Using Difference Between Scattering of Muscle Tissues and Reflection at Bone Surface

Mototaka Arakawa, Takumi Hashimoto, Taiga Bando, Shohei Mori, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

2021 IEEE International Ultrasonics Symposium (IUS)　2021/09/11
Publisher: IEEE
DOI： 10.1109/ius52206.2021.9593754 　
Preliminary Study on Estimation of Speed of Sound in Propagation Medium Considering Target Scatterer Size

Shohei Mori, Aoi Nakayama, Keiji Onoda, Mototaka Arakawa, Hiroshi Kanai

2021 IEEE International Ultrasonics Symposium (IUS)　2021/09/11
Publisher: IEEE
DOI： 10.1109/ius52206.2021.9593638 　
Strain Rate Distribution in Layered Myocardium Measured Using Local Velocity Estimator with Multifrequency Phase Differences

Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Ultrasound in Medicine and Biology　47　(9)　2768-2773　2021/09
Publisher: Elsevier BV
DOI： 10.1016/j.ultrasmedbio.2021.05.021 　

ISSN： 0301-5629

eISSN： 1879-291X
Estimation error in sound velocity depending on size of target scatterer Peer-reviewed

Aoi Nakayama, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDE17-1-SDDE17-6　2021/07/01

DOI： 10.35848/1347-4065/abf39e 　

ISSN： 0021-4922

eISSN： 1347-4065
A study on differentiation of depiction between scatterer and reflector to assist epidural anesthesia by ultrasound Peer-reviewed

Takumi Hashimoto, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDE15-SDDE15　2021/07/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/abf4a3 　

ISSN： 0021-4922

eISSN： 1347-4065
Low-complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming Peer-reviewed

Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Journal of Medical Ultrasonics　48　(3)　259-272　2021/07
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10396-021-01089-z 　

ISSN： 1346-4523

eISSN： 1613-2254
Stabilization of red blood cell aggregation evaluation using short-axis view of vein of ultrasound Peer-reviewed

Akiyo Fukase, Kyohei Higashiyama, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDE08-SDDE08　2021/07/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/abf3d5 　

ISSN： 0021-4922

eISSN： 1347-4065
Accuracy verification in ultrasonic elasticity measurement within intima-media complex visible range using phantom experimental system Peer-reviewed

Seira Akiyama, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDA07-SDDA07　2021/07/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/abef0d 　

ISSN： 0021-4922

eISSN： 1347-4065
Evaluation of error factors depending on ultrasonic transmitted beamwidth in measurement of myocardial minute velocity Peer-reviewed

Kana Sugahara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDE05-SDDE05　2021/07/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/abef0e 　

ISSN： 0021-4922

eISSN： 1347-4065
Estimation of viscoelasticity of radial artery during flow-mediated dilatation using a single ultrasound probe based on blood pressure measurement via pulse transit time method Peer-reviewed

Yuto Shoji, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

Japanese Journal of Applied Physics　60　(SD)　SDDE03-SDDE03　2021/07/01
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/abef0b 　

ISSN： 0021-4922

eISSN： 1347-4065
Measurement of propagation of local and minute contractile response in layered myocardium Peer-reviewed

Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

DOI： 10.35848/1347-4065/abeabf 　

ISSN： 0021-4922

eISSN： 1347-4065
硬膜外麻酔補助を目指した超音波の反射・散乱特性の差異による胸椎間隙の鮮鋭な描出

橋本拓実, 阪東泰河, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

超音波医学　48　(Suppl.)　S639-S639　2021/04
Publisher: (公社)日本超音波医学会
ISSN： 1346-1176

eISSN： 1881-9311
Multifrequency Phased Tracking Method for Estimating Velocity in Heart Wall Peer-reviewed

Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Ultrasound in Medicine and Biology　47　(4)　1077-1088　2021/04

DOI： 10.1016/j.ultrasmedbio.2020.12.011 　

ISSN： 0301-5629

eISSN： 1879-291X
Evaluation method of the degree of red blood cell aggregation considering ultrasonic propagation attenuation by analyzing ultrasonic backscattering properties Peer-reviewed

Kanta Nagasawa, Akiyo Fukase, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

Journal of Medical Ultrasonics　48　(1)　3-12　2021/01

DOI： 10.1007/s10396-020-01065-z 　

ISSN： 1346-4523

eISSN： 1613-2254
Basic study for size estimation of red blood cell aggregates by analyzing ultrasonic backscattering properties considering ultrasonic propagation attenuation

Mototaka Arakawa, Kanta Nagasawa, Akiyo Fukase, Kyohei Higashiyama, Shohei Mori, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

IEEE International Ultrasonics Symposium, IUS　2020-September　2020/09/07

DOI： 10.1109/IUS46767.2020.9251333 　

ISSN： 1948-5719

eISSN： 1948-5727
Measurement of change in viscoelasticity of radial artery during flow-mediated dilatation using a single ultrasonic probe

Yuto Shoji, Takumi Saito, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

IEEE International Ultrasonics Symposium, IUS　2020-September　2020/09/07

DOI： 10.1109/IUS46767.2020.9251414 　

ISSN： 1948-5719

eISSN： 1948-5727
Ultrasonic Measurement of Luminal Surface Roughness of Carotid Artery Wall with Removal of Local Displacement Induced by Blood Vessel Pulsation

Shohei Mori, Takahisa Abe, Mototaka Arakawa, Jens E. Wilhjelm, Hiroshi Kanai

IEEE International Ultrasonics Symposium, IUS　2020-September　2020/09/07

DOI： 10.1109/IUS46767.2020.9251812 　

ISSN： 1948-5719

eISSN： 1948-5727
超音波の反射特性と散乱特性の差異を用いた胸椎表面の描出に関する基礎検討

橋本拓実, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

電子情報通信学会技術研究報告(超音波)　120　(174)　7-12　2020/09
Publisher: (一社)電子情報通信学会
ISSN： 0913-5685

eISSN： 2432-6380
Estimation of viscoelasticity of radial artery via simultaneous measurement of changes in pressure and diameter using a single ultrasound probe Peer-reviewed

Takumi Saito, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

Japanese Journal of Applied Physics　59　SKKE04-01-SKKE04-07　2020/07/01

DOI： 10.35848/1347-4065/ab7f1c 　

ISSN： 0021-4922

eISSN： 1347-4065
Measurement of viscoelasticity of anisotropic viscoelastic phantom by dual ultrasound excitation Invited

Hibiki Kawamura, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Japanese Journal of Applied Physics　59　(SK)　2020/07/01

DOI： 10.35848/1347-4065/ab8bc0 　

ISSN： 0021-4922

eISSN： 1347-4065
Generalized coherence factor estimated from real signals in ultrasound beamforming Peer-reviewed

Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

Journal of Medical Ultrasonics　47　(2)　179-192　2020/04

DOI： 10.1007/s10396-019-01004-7 　

ISSN： 1346-4523

eISSN： 1613-2254
Shaped Crystal Growth of Fe–Al Alloy Plates by Micro Pulling down Method

K. Kamada, R. Murakami, M. Arakawa, T. Minamitani, T. Ueno, Y. Shoji, A. Yamaji, M. Yoshino, S. Kurosawa, Y. Yokota, Y. Ohashi, V. V. Kochurikhin, A. Yoshikawa

Acta Physica Polonica A　137　(5)　1009-1012　2020

DOI： 10.12693/APhysPolA.137.1009 　

ISSN： 0587-4246

eISSN： 1898-794X
Discrimination of thoracic spine from muscle based on their difference in ultrasound reflection and scattering characteristics. Peer-reviewed

Tomohiro Yokoyama, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

Journal of medical ultrasonics (2001)　47　(1)　3-11　2020/01

DOI： 10.1007/s10396-019-00964-0 　

More details Close

PURPOSE: Medical ultrasound is often used to specify the puncture position during epidural anesthesia. However, visualization of the thoracic spine is difficult because of the complex structure, i.e., it is difficult to determine whether the thoracic spine or muscle is depicted. Therefore, this study aims to distinguish bone from muscle tissue using the differences in reflection and scattering characteristics of ultrasound. METHODS: We experimentally investigated the difference in signals received from bone and muscle. We proposed a new parameter utilizing the ratio of the amplitude of the received signals averaged in a wide range around the ideal delay line and that only along the ideal delay line, to emphasize the bone. RESULTS: First, we confirmed the difference in signals received from bone and muscle tissue by basic experiments. We also investigated the difference by in vitro experiments using chicken thigh and in vivo experiments in humans. In both experiments, the proposed method succeeded to clearly depict bone, suppressing the depiction of muscle, compared with conventional B-mode imaging. CONCLUSION: Using the difference in the characteristics of reflection from bone and scattering from muscle tissue, we could distinguish bone from muscle tissue with the proposed method.
Speeds of Contraction Responses Propagating along Septum at Pre-ejection Period are Different Between Radial and Longitudinal Directions

Hiroshi Kanai, Shohei Mori, Mototaka Arakawa

2019 IEEE International Ultrasonics Symposium (IUS)　2019-October　1418-1420　2019/10
Publisher: IEEE
DOI： 10.1109/ultsym.2019.8925990 　

ISSN： 1948-5719

eISSN： 1948-5727
Accurate Estimation Method of Arterial Wall Movement in Longitudinal Direction

Koji Iwamori, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

2019 IEEE International Ultrasonics Symposium (IUS)　2019-October　460-462　2019/10
Publisher: IEEE
DOI： 10.1109/ultsym.2019.8925634 　

ISSN： 1948-5719

eISSN： 1948-5727
Correlation between Red Blood Cell Aggregation and Blood Glucose Level

Akiyo Fukase, Kanta Nagasawa, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

2019 IEEE International Ultrasonics Symposium (IUS)　2019-October　45-47　2019/10
Publisher: IEEE
DOI： 10.1109/ultsym.2019.8926267 　

ISSN： 1948-5719

eISSN： 1948-5727
Biomechanics of C2C12 Cells Observed with Cellular Resolution Scanning Acoustic Microscope Combined with Optical Microscope Peer-reviewed

Ryo Hirano, Makoto Kanzaki, Mototaka Arakawa, Norma Hermawan, Kazuto Kobayashi, Yoshifumi Saijo

Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS　4828-4831　2019/07

DOI： 10.1109/EMBC.2019.8857008 　

ISSN： 1557-170X
Local two-dimensional distribution of propagation speed of myocardial contraction for ultrasonic visualization of contraction propagation Peer-reviewed

A. Hayashi, S. Mori, M. Arakawa, H. Kanai

Japanese Journal of Applied Physics　58　(SG)　SGGE05-1-SGGE05-7　2019/07

DOI： 10.7567/1347-4065/ab0d0b 　

ISSN： 0021-4922

eISSN： 1347-4065
Evaluation of SiO2 thin films on piezoelectric substrates using line-focus-beam ultrasonic material characterization system Peer-reviewed

R. Suenaga, M. Suzuki, S. Kakio, Y. Ohashi, M. Arakawa, J. Kushibiki

Japanese Journal of Applied Physics　58　(SG)　SGGA05-1-SGGA05-6　2019/07

DOI： 10.7567/1347-4065/ab14d4 　
A new evaluation method for dependence of width of transmitted waves on accuracy in multipoint simultaneous ultrasonic measurements of cardiac wall vibration waveform Peer-reviewed

N. Furusawa, S. Mori, M. Arakawa, H. Kanai

Japanese Journal of Applied Physics　58　(SG)　SGGA08-1-SGGA08-6　2019/07

DOI： 10.7567/1347-4065/ab1a30 　

ISSN： 0021-4922

eISSN： 1347-4065
Blood pressure measurement using piezoelectric effect by an ultrasonic probe Peer-reviewed

M. Arakawa, K. Kudo, K. Kobayashi, H. Kanai

Sensors and Actuators A: Physical　286　146-151　2019/02

DOI： 10.1016/j.sna.2018.12.019 　

ISSN： 0924-4247
Correction of phase rotation in pulse spectrum method for scanning acoustic microscopy and its application to measurements of cells Peer-reviewed

Nagaoka R, Kobayashi K, Arakawa M, Hasegawa H, Saijo Y

Ultrasonics　99　2019

DOI： 10.1016/j.ultras.2019.105949 　
Development of an ultrasonic probe to measure both radial arterial pressure and diameter change at the same position for early diagnosis of vascular endothelial function: Preliminary study Peer-reviewed

Arakawa M, Saito T, Mori S, Ohba S, Kobayashi K, Kanai H

Sensors and Actuators, A: Physical　297　111487-111487　2019
Publisher: Elsevier BV
DOI： 10.1016/j.sna.2019.07.011 　

ISSN： 0924-4247
Ultrasound scattering by aggregated red blood cells in patients with diabetes Peer-reviewed

H. Sakaki, M. Arakawa, S. Yashiro, Y. Todate, Y. Ishigaki, H. Kanai

J. Med. Ultrasonics　46　(1)　3-14　2019/01

DOI： 10.1007/s10396-018-0892-z 　

ISSN： 1346-4523

eISSN： 1613-2254
Estimation method for sound velocity distribution for high-resolution ultrasonic tomographic imaging Peer-reviewed

K. Abe, M. Arakawa, H. Kanai

J. Med. Ultrasonics　46　(1)　27-33　2019/01

DOI： 10.1007/s10396-018-0915-9 　

ISSN： 1346-4523

eISSN： 1613-2254
Ultrasonic detection of decrease in propagation velocity of contraction response due to myocardial ischemia in swine heart wall Peer-reviewed

A. Hayashi, M. Arakawa, H. Yamamoto, S. Morosawa, H. Shimokawa, H. Kanai

Jpn. J. Med. Ultrasonics　45　(6)　595-603　2018/11

DOI： 10.3179/jjmu. 　
Robust analysis method for acoustic properties of biological specimens measured by acoustic microscopy Peer-reviewed

M. Arakawa, S. Mori, H. Kanai, R. Nagaoka, M. Horie, K. Kobayashi, Y. Saijo

Japanese Journal of Applied Physics　57　(7S1)　07LB07-1-07LB07-7　2018/07

DOI： 10.7567/JJAP.57.07LB07 　

ISSN： 0021-4922

eISSN： 1347-4065
Accuracy improvement in measurement of arterial wall elasticity by applying pulse inversion to phased-tracking method Peer-reviewed

Y. Miyachi, M. Arakawa, H. Kanai

Japanese Journal of Applied Physics　57　(7S1)　07LF08-1-07LF08-10　2018/07

DOI： 10.7567/JJAP.57.07LF08 　

ISSN： 0021-4922

eISSN： 1347-4065
Frequency characteristics of vibration generated by dual acoustic radiation force for estimating viscoelastic properties of biological tissues Peer-reviewed

R. Watanabe, M. Arakawa, H. Kanai

Japanese Journal of Applied Physics　57　(7S1)　07LF09-1-07LF09-7　2018/07

DOI： 10.7567/JJAP.57.07LF09 　

ISSN： 0021-4922

eISSN： 1347-4065
Local pulse wave velocity estimated from small vibrations measured ultrasonically at multiple points on the arterial wall Peer-reviewed

M. Ito, M. Arakawa, H. Kanai

Japanese Journal of Applied Physics　57　(7S1)　07LF14-1-07LF14-8　2018/07

DOI： 10.7567/JJAP.57.07LF14 　

ISSN： 0021-4922

eISSN： 1347-4065
Propagation properties of leaky surface acoustic wave on water-loaded piezoelectric substrate Peer-reviewed

R. Suenaga, M. Suzuki, S. Kakio, Y. Ohashi, M. Arakawa, J. Kushibiki

Japanese Journal of Applied Physics　57　(7S1)　07LC10-1-07LC10-5　2018/07

DOI： 10.7567/JJAP.57.07LC10 　
A method for the design of ultrasonic devices for scanning acoustic microscopy using impulsive signals Peer-reviewed

Mototaka Arakawa, Hiroshi Kanai, Kazuo Ishikawa, Ryo Nagaoka, Kazuto Kobayashi, Yoshifumi Saijo

Ultrasonics　84　172-179　2018/03/01
Publisher: Elsevier B.V.
DOI： 10.1016/j.ultras.2017.10.023 　

ISSN： 0041-624X
Ultrasonic measurement of propagation of leading edge contraction from interventricular septum to left ventricular posterior wall for the human heart Peer-reviewed

A. Hayashi, M. Arakawa, H. Kanai

Jpn. J. Med. Ultrasonics　45　(2)　191-198　2018/03

DOI： 10.3179/jjmu.JJMU.A.102 　
Evaluation of piezoeletric Ta2O5 thin films using line-focus-beam ultrasonic material characterization system

R. Suenaga, M. Suzuki, S. Kakio, Y. Ohashi, M. Arakawa, J. Kushibiki

2018 IEEE International Ultrason. Symp. Proc.　2018

DOI： 10.1109/ULTSYM.2018.8579754 　
Ultrasonically measured propagation speed of myocardial contraction rapidly decreased in swine heart just after avascularisation of coronary artery

A. Hayashi, S. Mori, M. Arakawa, H. Yamamoto, S. Morosawa, H. Shimokawa, H. Kanai

2018 IEEE International Ultrason. Symp. Proc.　2018
Publisher: IEEE
DOI： 10.1109/ULTSYM.2018.8579780 　
An ultrasonic probe to measure both radial arterial pressure and diameter at identical position for early diagnosis of arteriosclerosis

M. Arakawa, T. Saito, S. Mori, S. Ohba, K. Kobayashi, H. Kanai

2018 IEEE International Ultrason. Symp. Proc.　2018
Publisher: IEEE
DOI： 10.1109/ULTSYM.2018.8579854 　
Spiral complex movements of the heart wall at the beginning of myocardial contraction detected by high frame speckle tracking

I. Kobayashi, S. Mori, M. Arakawa, H. Kanai

2018 IEEE International Ultrason. Symp. Proc.　2018
Publisher: IEEE
DOI： 10.1109/ULTSYM.2018.8579988 　
Red blood cell aggregation measurement with 40-MHz ultrasound has a possibility for noninvasive evaluation of blood glucose level in patients with diabetes

M. Arakawa, H. Sakaki, K. Nagasawa, A. Fukase, S. Mori, S. Yashiro, Y. Ishigaki, H. Kanai

2018 IEEE International Ultrason. Symp. Proc.　2018
Publisher: IEEE
DOI： 10.1109/ULTSYM.2018.8580086 　
Development and melt growth of novel scintillating halide crystals Peer-reviewed

Akira Yoshikawa, Yuui Yokota, Yasuhiro Shoji, Robert Kral, Kei Kamada, Shunsuke Kurosawa, Yuji Ohashi, Mototaka Arakawa, Valery I. Chani, Vladimir V. Kochurikhin, Akihiro Yamaji, Medvedev Andrey, Martin Nikl

Optical Materials　74　109-119　2017/12

DOI： 10.1016/j.optmat.2017.03.043 　

ISSN： 0925-3467
Temperature dependence of acoustic property of Ca3Ta( Ga, Al)3Si2O14 single crystals Peer-reviewed

Yuji Ohashi, Mototaka Arakawa, Yuui Yokota, Yasuhiro Shoji, Akihiro Yamaji, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa

JAPANESE JOURNAL OF APPLIED PHYSICS　56　(7)　07JB03-1-07JB03-5　2017/07

DOI： 10.7567/JJAP.56.07JB03 　

ISSN： 0021-4922

eISSN： 1347-4065
Relationships among chemical composition, lattice constants, and acoustic properties for Ca3Ta(Ga1-xAlx)3Si2O14 single crystals Peer-reviewed

Yuji Ohashi, Masanori Kitahara, Tetsuo Kudo, Mototaka Arakawa, Yuui Yokota, Yasuhiro Shoji, Akihiro Yamaji, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa

JOURNAL OF CRYSTAL GROWTH　468　376-381　2017/06

DOI： 10.1016/j.jcrysgro.2016.10.040 　

ISSN： 0022-0248

eISSN： 1873-5002
Growth of platinum fibers using the micro-pulling-down method Peer-reviewed

Takayuki Nihei, Yuui Yokota, Mototaka Arakawa, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada, Valery Chani, Akira Yoshikawa

JOURNAL OF CRYSTAL GROWTH　468　403-406　2017/06

DOI： 10.1016/j.jcrysgro.2016.10.088 　

ISSN： 0022-0248

eISSN： 1873-5002
The divalent ion codoping effect on Ce-doped (Gd, La)(2)Si2O7 single crystals Peer-reviewed

Takahiko Horiai, Rikito Murakami, Shunsuke Kurosawa, Yasuhiro Shoji, Akihiro Yamaji, Jan Pejchal, Yuji Ohashi, Mototaka Arakawa, Kei Kamada, Yuui Yokota, Akira Yoshikawa

OPTICAL MATERIALS　68　42-46　2017/06

DOI： 10.1016/j.optmat.2017.02.062 　

ISSN： 0925-3467

eISSN： 1873-1252
超音波による心臓の高時間分解能計測を目指した平面波幅の測定

古澤直也, 荒川元孝, 金井浩

電気関係学会東北支部連合大会講演論文集　2017　219-219　2017
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2017.0_219 　
超音波による高精度なヒト脊椎表面描出に関する研究

横山智大, 荒川元孝, 大西詠子, 山内正憲, 金井浩

電気関係学会東北支部連合大会講演論文集　2017　223-223　2017
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2017.0_223 　
動脈硬化症における動脈壁の局所的弾性特性の計測

岩森光司, 荒川元孝, 長谷川英之, 金井浩

電気関係学会東北支部連合大会講演論文集　2017　222-222　2017
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2017.0_222 　
超音波による血管領域描出の高分解能化を目指した音速分布推定に関する基礎検討

阿部啓一郎, 荒川元孝, 金井浩

電気関係学会東北支部連合大会講演論文集　2017　220-220　2017
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2017.0_220 　
心筋虚血部同定を目的とした心筋収縮伝播の超音波計測に関する検討

林あかね, 荒川元孝, 山本裕明, 平野道基, 諸沢薦, 下川宏明, 金井浩

電気関係学会東北支部連合大会講演論文集　2017　218-218　2017
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2017.0_218 　
Ultrasonic microspectroscopy characterization of chemically tempered glass Peer-reviewed

Mototaka Arakawa, Jun-Ichi Kushibiki, Yuji Ohashi

Japanese Journal of Applied Physics　56　(1)　016601-1-016601-6　2017/01/01
Publisher: Japan Society of Applied Physics
DOI： 10.7567/JJAP.56.016601 　

ISSN： 1347-4065 0021-4922
Crystal growth and piezoelectric properties of Ca3Ta(Ga1-x Sc-x)(3)Si2O14 single crystals Peer-reviewed

Yu Igarashi, Yuji Ohashi, Yuui Yokota, Mototaka Arakawa, Kenji Inoue, Akihiro Yamaji, Yasuhiro Shoji, Kei Kamada, Shunsuke Kurosawa, Akira Yoshikawa

CERAMICS INTERNATIONAL　43　(Suppl. 1)　S136-S139　2017

DOI： 10.1016/j.ceramint.2017.05.272 　

ISSN： 0272-8842

eISSN： 1873-3956
Depth analysis of a compression layer in chemically strengthened glass using depth-resolved micro-Raman spectroscopy Peer-reviewed

Nobuaki Terakado, Shohei Uchida, Yoshihiro Takahashi, Takumi Fujiwara, Mototaka Arakawa

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　124　(10)　1164-1166　2016/10

DOI： 10.2109/jcersj2.16138 　

ISSN： 1882-0743

eISSN： 1348-6535
Al content dependence of acoustic properties for Ca3Nb(Ga1−xAlx)3Si2O14 single crystals

Yuji Ohashi, Mototaka Arakawa, Yuui Yokota, Kenji Inoue, Akihiro Yamaji, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa

2016 IEEE International Ultrasonics Symposium (IUS)　2016/09
Publisher: IEEE
DOI： 10.1109/ultsym.2016.7728806 　
Dependence of acoustic property on Al substitution for Ca3Ta(Ga1-xAlx)(3)Si2O14 single crystals Peer-reviewed

Yuji Ohashi, Mototaka Arakawa, Tetsuo Kudo, Yuui Yokota, Yasuhiro Shoji, Shunsuke Kurosawa, Kei Kamada, Jun-ichi Kushibiki, Akira Yoshikawa

JAPANESE JOURNAL OF APPLIED PHYSICS　55　(7)　07KB06-1-07KB06-5　2016/07

DOI： 10.7567/JJAP.55.07KB06 　

ISSN： 0021-4922

eISSN： 1347-4065
Control of zero-crossing temperature of coefficient of thermal expansion and reduction of mechanical residual stress for TiO2-SiO2 glass optical cavity Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki, Yuji Ohashi, Yuko Maruyama, Naofumi Yamada, Shigeo Nagano, Ying Li, Mizuhiko Hosokawa, Yuko Hanado, Masahiko Watanabe, Koji Watanabe, Kenji Abe, Kazuyuki Etoh, Kazuhiko Ito

JAPANESE JOURNAL OF APPLIED PHYSICS　54　(9)　096702-1-096702-6　2015/09

DOI： 10.7567/JJAP.54.096702 　

ISSN： 0021-4922

eISSN： 1347-4065
Development of an Ultrasound Microscope Combined With Optical Microscope for Multiparametric Characterization of a Single Cell Peer-reviewed

Mototaka Arakawa, Joe Shikama, Koki Yoshida, Ryo Nagaoka, Kazuto Kobayashi, Yoshifumi Saijo

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　62　(9)　1615-1622　2015/09

DOI： 10.1109/TUFFC.2014.006865 　

ISSN： 0885-3010

eISSN： 1525-8955
Basic study of intrinsic elastography: Relationship between tissue stiffness and propagation velocity of deformation induced by pulsatile flow Peer-reviewed

Ryo Nagaoka, Ryosuke Iwasaki, Mototaka Arakawa, Kazuto Kobayashi, Shin Yoshizawa, Shin-ichiro Umemura, Yoshifumi Saijo

JAPANESE JOURNAL OF APPLIED PHYSICS　54　(7)　07HF08-1-07HF08-8　2015/07

DOI： 10.7567/JJAP.54.07HF08 　

ISSN： 0021-4922

eISSN： 1347-4065
Measurement of acoustic properties of cells using high frequency acoustic microscopy

T. Igo, M. Arakawa, K. Kobayashi, R. Nagaoka, Y. Saijo

Proc. 13th International Symp. Advanced Biomedical Ultrasound　20-20　2015
Designs of ultrasonic devices for ultrasonic microscopy using pulse signals

M. Arakawa, K. Ishikawa, R. Nagaoka, K. Kobayashi, Y. Saijo

Proc. 13th International Symp. Advanced Biomedical Ultrasound　1-1　2015
Development of acoustic microscope for biological tissue and its application Peer-reviewed

Mototaka Arakawa, Joe Shikama, Koki Yoshida, Ryo Nagaoka, Kazuto Kobayashi, Yoshifumi Saijo

Transactions of Japanese Society for Medical and Biological Engineering　52　5-SY-6　2014/08/17
Publisher: Japan Soc. of Med. Electronics and Biol. Engineering
DOI： 10.11239/jsmbe.52.SY-5 　

ISSN： 1347-443X 1881-4379
Measurement of acoustic parameters of single cell by ultrasound microscope

Yoshida Koki, Abuhabsah Rami, Pawlicki D. Alexander, Shikama Joe, Nagaoka Ryo, Arakawa Mototaka, Kobayashi Kazuto, Saijo Yoshifumi, O'brien Jr D. William

BME　52　O-341-O-342　2014
Publisher: Japanese Society for Medical and Biological Engineering
DOI： 10.11239/jsmbe.52.O-341 　

ISSN： 1347-443X

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Recently, the biomechanics of cell has received attention because the study on the biomechanics will lead to development of diagnosis and treatment of cancer and arteriosclerosis. Most methods on the measurement of biomechanics require direct contact to the cell. Because the square of sound speed is proportional to the cell elasticity, non-contact measurement of sound speed with ultrasound microscopy can obtain the mechanical properties. In the present study, quantitative measurement of cell parameters such as thickness, sound speed, acoustic impedance, density, bulk modulus, attenuation and images of each parameter are successfully obtained. The transducer had 150 MHz center frequency and f-number of 0.88 and focal length of 3.8 mm. Pulse spectrum analysis was applied to calculate thickness and sound speed of the cells because the signal from a cell surface was not distinguished from the echo from the petri dish. This study may contribute measurement of cellular biomechanics.
Two-dimensional Blood Flow Vectors Obtained with Bidirectional Doppler Ultrasound Peer-reviewed

Genta Masuno, Ryo Nagaoka, Aiko Omori, Yasuo Ishikawa, Osamu Akagawa, Mototaka Arakawa, Yoshifumi Saijo

2014 36TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)　5093-5096　2014

DOI： 10.1109/EMBC.2014.6944770 　

ISSN： 1557-170X
A Novel Method of Evaluating Surface Properties of Tempered Glasses by the Ultrasonic Microspectroscopy Technology

Mototaka Arakawa, Jun-ichi Kushibiki, Kuniko Kawaguchi, Nobuo Takeda

2014 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　1392-1395　2014

DOI： 10.1109/ULTSYM.2014.0344 　

ISSN： 1948-5719
Multiparametric Characterization of a Single Cell by an Ultrasound and Optical Combined Microscope

Yoshifumi Saijo, Joe Shikama, Koki Yoshida, Ryo Nagaoka, Mototaka Arakawa, Kazuto Kobayashi

2014 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　727-730　2014

DOI： 10.1109/ULTSYM.2014.0179 　

ISSN： 1948-5719
Homogeneity improvement of TiO2-SiO2 glass synthesized by the soot method and its evaluation using the ultrasonic measurement system Peer-reviewed

Masahiro Kawagishi, Junko Konishi, Masaaki Takata, Mototaka Arakawa, Yuji Ohashi, Jun-ichi Kushibiki

EXTREME ULTRAVIOLET (EUV) LITHOGRAPHY IV　8679　86791N-1-86791N -7　2013

DOI： 10.1117/12.2011655 　

ISSN： 0277-786X
Measurements of Acoustical Physical Constants of La3Ta0.5Ga5.3Al0.2O14 Single Crystals at High Temperatures Peer-reviewed

Tomoaki Karaki, Tao Lv, Masatoshi Adachi, Yuji Ohashi, Mototaka Arakawa, Jun-ichi Kushibiki

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(9)　09LD09-1-09LD09-4　2012/09

DOI： 10.1143/JJAP.51.09LD09 　

ISSN： 0021-4922
Surface Acoustic Wave Properties of Amorphous Ta2O5 and Nb2O5 Thin Films Prepared by Radio Frequency Sputtering Peer-reviewed

Shoji Kakio, Keiko Hosaka, Mototaka Arakawa, Yuji Ohashi, Jun-ichi Kushibiki

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(7)　07GA01-1-07GA01-5　2012/07

DOI： 10.1143/JJAP.51.07GA01 　

ISSN： 0021-4922
Application of the ultrasonic micro-spectroscopy technology to next generation functional glasses

Proc. the 5th Int. Symp. and 4th Student Organizing Int. Mini-Conf. on Information Electronics Systems - Center of Education and Research for Information Electronics Systems - (CERIES-GCOE/SOIM)　126-131　2012/02
Study on evaluation of F-doped silica glass by the Ultrasonic Microspectroscopy Technology

Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2012　24-24　2012
Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan
DOI： 10.11528/tsjc.2012.0_24 　
Determination Method of Acoustical Physical Constants and Their Temperature Coefficients of La3Ta0.5Ga5.3Al0.2O14 Single Crystal

Yuji Ohashi, Hitoshi Yoshida, Mototaka Arakawa, Jun-ichi Kushibiki, Tomoaki Karakai, Tao Lv, Masatoshi Adachi

2012 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　2738-2741　2012

DOI： 10.1109/ULTSYM.2012.0686 　
Ultrasonic Microspectroscopy Measurement of Fictive Temperature for Synthetic Silica Glass Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Yuji Ohashi, Yuko Maruyama

APPLIED PHYSICS EXPRESS　4　(5)　056601-1-056601-3　2011/05

DOI： 10.1143/APEX.4.056601 　

ISSN： 1882-0778
Measurements of acoustical physical constants of La3Ta0.5Ga5.3Al0.2O14 single crystal for pressure sensors

Y. Ohashi, T. Karaki, T. Lv, M. Arakawa, M. Adachi, J. Kushibiki

The 3rd International Symposium on Innovations in Advanced Materials for Optics & Electronics　110　(213(US2010 48-69))　87-88　2010/10

ISSN： 0913-5685
Ultrasonic micro-spectroscopy characterization of ZnO

J. Kushibiki, Y. Ohashi, M. Arakawa

Fourth International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems　159-164　2010/03
Development of an Ultrasonic System for Super-Precise Measurement of Zero-CTE Temperature of EUVL-Grade TiO(2)-SiO(2) Ultra-Low-Expansion Glasses Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Yuji Ohashi, Toshio Sannomiya, Yuko Maruyama

EXTREME ULTRAVIOLET (EUV) LITHOGRAPHY　7636　76362M -1-76362M -8　2010

DOI： 10.1117/12.846570 　

ISSN： 0277-786X
Ultrasonic Microspectroscopy of ZnO Single Crystals Grown by the Hydrothermal Method Peer-reviewed

Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka, Sho Yoshida, Yuusuke Kourai, Noboru Sakagami

JAPANESE JOURNAL OF APPLIED PHYSICS　49　(2)　026602-1-026602-8　2010

DOI： 10.1143/JJAP.49.026602 　

ISSN： 0021-4922
Measurements of Acoustic Properties of ZnO Single Crystals by the LFB/PW Ultrasonic Material Characterization System

Y. Kourai, S. Yoshida, Y. Ohashi, M. Arakawa, J. Kushibiki, N. Sakagami

Proc. 2009 IEEE International Ultrasonics Symp.　1169-1172　2009/09

DOI： 10.1109/ULTSYM.2009.5441664 　
Development of a Micro Line-Focus-Beam Ultrasonic Device Peer-reviewed

Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka, Sho Yoshida, Kouji Asano

APPLIED PHYSICS EXPRESS　2　(8)　086501-1-086501-3　2009/08

DOI： 10.1143/APEX.2.086501 　

ISSN： 1882-0778
Ultrasonic micro-spectroscopy characterization of ZnO and AlN crystals

J. Kushibiki, Y. Ohashi, M. Arakawa

Proc. the 3rd Int. Symp. Information Electronics Systems - Center of Education and Research for Information Electronics Systems - (CERIES-GCOE09)　114-117　2009/07
Procedures for determining acoustical physical constants of class 6mm single crystals by ultrasonic microspectroscopy technology Peer-reviewed

Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka

JOURNAL OF APPLIED PHYSICS　105　(11)　114913-1-114913-9　2009/06

DOI： 10.1063/1.3141784 　

ISSN： 0021-8979
A Promising Method of Evaluating ZnO Single Crystals Using the Line-Focus-Beam Ultrasonic Material-Characterization System Peer-reviewed

Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka

APPLIED PHYSICS EXPRESS　2　(2)　026501-1-026501-3　2009/02

DOI： 10.1143/APEX.2.026501 　

ISSN： 1882-0778
Precise Evaluation of Zero-CTE Temperature of EUVL-grade TiO(2)-SiO(2) Ultra-Low-Expansion Glass Using the Line-Focus-Beam Ultrasonic Material Characterization System Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa

ALTERNATIVE LITHOGRAPHIC TECHNOLOGIES　7271　72713D -1-72713D -6　2009

DOI： 10.1117/12.814179 　

ISSN： 0277-786X
Characterization of ZnO polycrystalline films on silica glass by the LFB ultrasonic material characterization system

Jun-Ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Sho Yoshida, Yuusuke Kourai, Takanori Kondo, Satoshi Fujii

Proceedings - IEEE Ultrasonics Symposium　1575-1578　2009

DOI： 10.1109/ULTSYM.2009.5441455 　

ISSN： 1051-0117
Evaluation of elastic inhomogeneity in ZnO crystal by means of the micro-LFB ultrasonic material characterization system

Jun-Ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Sho Yoshida, Noboru Sakagami

Proceedings - IEEE Ultrasonics Symposium　799-802　2009

DOI： 10.1109/ULTSYM.2009.5441424 　

ISSN： 1051-0117
Evaluation of synthetic silica glasses by the ultrasonic microspectroscopy technology

Mototaka Arakawa, Hideki Shimamura, Jun-Ichi Kushibiki

Proceedings - IEEE Ultrasonics Symposium　1559-1562　2009

DOI： 10.1109/ULTSYM.2009.5441923 　

ISSN： 1051-0117
Ultrasonic micro-spectroscopy characterization of ZnO and AlN single crystals Invited

Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka

Proc. of Third Japn-Taiwan Workshop on Future Frequency Control Devices　9-15　2008/12
easurement of lattice constants for diamond single crystal by repetition growth using the MPCVD process by x-ray diffractometer using the Bond method

T. Shishitani, M. Arakawa, Y. Ohashi, J. Kushibiki, Y. Mokuno, A. Chayahara, S. Shikata

Proc. the 1st Student Organizing Int. Mini-Conference on Information Electronics Systems (SOIM-GCOE08)　119-120　2008/10
Homogenous TiO2-SiO2 ultra-low-expansion glass for the extreme ultra-violet lithography system evaluated by the line-focus-beam ultrasonic material characterization system

J. Kushibiki, M. Arakawa

Proc. 2nd Int. Symp. Information Electronics Systems - Center of Education and Research for Information Electronics Systems - (CERIES-GCOE08)　34-37　2008/08
Homogeneous TiO2-SiO2 ultralow-expansion glass for extreme ultraviolet lithography evaluated by the line-focus-beam ultrasonic material characterization system Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Tetsuji Ueda, Akira Fujinoki

APPLIED PHYSICS EXPRESS　1　(8)　087002-1-087002-3　2008/08

DOI： 10.1143/APEX.1.087002 　

ISSN： 1882-0778
Ultrasonic microspectroscopy characterization of AlN single crystals Peer-reviewed

Yuji Ohashi, Mototaka Arakawa, Jun-ichi Kushibiki, Boris M. Epelbaum, Albrecht Winnacker

APPLIED PHYSICS EXPRESS　1　(7)　077004-1-077004-3　2008/07

DOI： 10.1143/APEX/1.077004 　

ISSN： 1882-0778
Super-precise evaluation of EUVL-grade ultra-low-expansion glasses using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Yuji Ohashi

精密工学会誌　74　(7)　673-678　2008/07
Publisher: The Japan Society for Precision Engineering
DOI： 10.2493/jjspe.74.673 　

ISSN： 0912-0289
Ultrasonic micro-spectroscopy of synthetic sapphire crystals Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki, Yasuo Madani

JAPANESE JOURNAL OF APPLIED PHYSICS　47　(4)　2285-2287　2008/04

DOI： 10.1143/JJAP.47.22851 　

ISSN： 0021-4922
Evaluation of TiO2-SiO2 ultra-low-expansion glass fabricated by the soot method using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Tetsuji Ueda, Akira Fujinoki

EMERGING LITHOGRAPHIC TECHNOLOGIES XII, PTS 1 AND 2　6921　69213P-1-69213P-8　2008

DOI： 10.1117/12.772259 　

ISSN： 0277-786X

eISSN： 1996-756X
Study on Acoustical Physical Constants of ZnO Single Crystal Using the Ultrasonic Microspectroscopy Technology

Tomoya Tanaka, Yuji Ohashi, Mototaka Arakawa, Jun-ichi Kushibiki, Noboru Sakagami

2008 IEEE ULTRASONICS SYMPOSIUM　737-740　2008

DOI： 10.1109/ULTSYM.2008.0176 　

ISSN： 1051-0117
Measurement Model for Attenuation of Leaky Surface Acoustic Waves by the Line-Focus-Beam Ultrasonic Material Characterization System

Jun-ichi Kushibiki, Mototaka Arakawa, Sho Yoshida, Kenji Otsu

2008 IEEE ULTRASONICS SYMPOSIUM　611-614　2008

DOI： 10.1109/ULTSYM.2008.0146 　

ISSN： 1051-0117
Evaluation and selection of EUVL-grade TiO2-SiO2 ultra-low expansion glasses using the line-focus-beam ultrasonic material characterization system

M. Arakawa, Y. Ohashi, J. Kushibiki

Proc. JCA 2007　P-1-26　2007/06
Measurements of acoustic properties of two sapphire single crystals

Mototaka Arakawa, Yasuo Madani, Jun-ichi Kushibiki

Proc. JCA2007　P-1-28　2007/06
A super-precise method of evaluating and selecting EUVL-grade TiO₂-SiO₂ ultra-low-expansion glasses using the line-focus-beam ultrasonic material characterization system Invited

Jun-ichi Kushibiki, Mototaka Arakawa, Yuji Ohashi

Proc. of Japn-Taiwan Workshop on Future Frequency Control Devices　69-75　2007/03
Application of the ultrasonic microspectroscopy system to wide bandgap semiconductor materials

J. Kushibiki, Y. Ohashi, M. Arakawa

Proc. the joint international conference of 4th international symposium on system construction of global-network-oriented information electronics and student-organizing international mini-conference on information electronics system, IGNOIE-COE06 and SOIM-COE06　56-61　2007/01
Theoretical consideration of determining accurate acoustical physical constants of AlN single crystals

Y. Ohashi, M. Arakawa, H. Odagawa, J. Kushibiki

Proc. the joint international conference of 4th international symposium on system construction of global-network-oriented information electronics and student-organizing international mini-conference on information electronics system, IGNOIE-COE06 and SOIM-COE06　268-269　2007/01
Evaluation and selection of EUVL-grade TiO2-SiO2 ultra-low-expansion glasses using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Mototaka Arakawa, Yuji Ohashi, Jun-ichi Kushibiki

EMERGING LITHOGRAPHIC TECHNOLOGIES XI, PTS 1 AND 2　6517　P-1-26-651725-8　2007

DOI： 10.1117/12.712203 　

ISSN： 0277-786X

eISSN： 1996-756X
UHF-range longitudinal acoustic property measurement of liquid specimens using multiple interference in a thin specimen layer

H. Odagawa, K. Miura, M. Arakawa, N. Akashi, J. Kushibiki, F. Dunn

Proc. of 9th Sendai Symposium on Ultrasonic Tissue Characterization　2006/11
Accurate velocity measurement of periodic striae of TiO2-SiO2 glasses by the line-focus-beam ultrasonic material-characterization system Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki, Yuji Ohashi, Kouji Suzuki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　45　(11)　8925-8927　2006/11

DOI： 10.1143/JJAP.45.8925 　

ISSN： 0021-4922
Evaluation method of TiO2-SiO2 ultra-low-expansion glasses with periodic striae using the LFB ultrasonic material characterization system Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Yuji Ohashi, Kouji Suzuki

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　53　(9)　1627-1636　2006/09

DOI： 10.1109/TUFFC.2006.1678191 　

ISSN： 0885-3010
Experimental study for evaluating striae structure of TiO2-SiO2 glasses using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Yuji Ohashi, Jun-ichi Kushibiki, Mototaka Arakawa, Kouji Suzuki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　45　(8A)　6445-6451　2006/08

DOI： 10.1143/JJAP.45.6445 　

ISSN： 0021-4922
Improvement of velocity measurement accuracy of leaky surface acoustic waves for materials with highly attenuated waveform of the V(z) curve by the line-focus-beam ultrasonic material characterization system Peer-reviewed

Y Ohashi, M Arakawa, J Kushibiki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　45　(5B)　4505-4510　2006/05

DOI： 10.1143/JJAP.45.4505 　

ISSN： 0021-4922
Accurate calibration line for super-precise coefficient of thermal expansion evaluation technology of TiO2-doped SiO2 ultra-low-expansion glass using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki, Yuji Ohashi, Kouji Suzuki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　45　(5B)　4511-4515　2006/05

DOI： 10.1143/JJAP.45.4511 　

ISSN： 0021-4922
Application of the line-focus-beam ultrasonic material characterization system to evaluation of TiO2-SiO2 ultra-low-expansion glasses

J. Kushibiki, M. Arakawa, Y.Ohashi

Proc. the 3rd international symposium on system construction of global-network-oriented information electronics, (IGNOIE-COE05)　123-128　2006/01
Striae evaluation of TiO2-SiO2 ultra-low expansion glasses using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki, Yuji Ohashi

EMERGING LITHOGRAPHIC TECHNOLOGIES X, PTS 1 AND 2　6151　U1080-U1087　2006

DOI： 10.1117/12.656396 　

ISSN： 0277-786X
VHF/UHF range bioultrasonic spectroscopy system and method Peer-reviewed

N. Akashi, M. Arakawa, H. Odagawa, T. Sannomiya, J. Kushibiki, N. Chubachi, F. Dunn

J. Acoust. Soc. Am. (Program: 4th Joint Meeting: ASA and ASJ)　120　(5)　3193-3193　2006
Evaluation of glass materials by using the line-focus-beam ultrasonic-material-characterization system Peer-reviewed

J Kushibiki, M Arakawa, Y Ohashi, R Okabe

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　52　(7)　1152-1160　2005/07

DOI： 10.1109/TUFFC.2005.1504001 　

ISSN： 0885-3010
A super-precise CTE evaluation method for ultra-low-expansion glasses using the LFB ultrasonic material characterization system Peer-reviewed

J Kushibiki, M Arakawa, Y Ohashi, K Suzuki, T Maruyama

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　44　(6B)　4374-4380　2005/06

DOI： 10.1143/JJAP.44.4374 　

ISSN： 0021-4922
Application of the line-focus-beam ultrasonic material characterization system to evaluation of ultra-low-expansion glasses for the extreme ultra-violet lithography system

J. Kushibiki, M. Arakawa, Y. Ohashi, K. Suzuki, T. Maruyama

Proc. the 2nd international symposium on system construction of global-network-oriented information electronics (IGNOIE-COE04)　63-67　2005/01
A super-precision evaluation method of ultra-low expansion glasses using the line-focus-beam ultrasonic material characterization system Peer-reviewed

J Kushibiki, M Arakawa, Y Ohashi, K Suzuki, T Maruyama

Metrology, Inspection, and Process Control for Microlithography XIX, Pts 1-3　5752　961-965　2005

DOI： 10.1117/12.599160 　

ISSN： 0277-786X
Super-accurate velocity measurement for evaluating TiO2-SiO2 ultra-low-expansion glass using the line-focus-beam ultrasonic material characterization system Peer-reviewed

Y Ohashi, M Arakawa, JI Kushibiki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　44　(42-45)　L1313-L1315　2005

DOI： 10.1143/JJAP.44.L1313 　

ISSN： 0021-4922
A promising evaluation method of ultra-low-expansion glasses for the extreme ultra-violet lithography system by the line-focus-beam ultrasonic material characterization system Peer-reviewed

J Kushibiki, M Arakawa, Y Ohashi, K Suzuki, T Maruyama

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　43　(11A)　L1455-L1457　2004/11

DOI： 10.1143/JJAP.43.L1455 　

ISSN： 0021-4922
Piezoelectric properties of Ca3NbGa3Si2O14 single crystal Peer-reviewed

T Karaki, R Sato, M Adachi, J Kushibiki, M Arakawa

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　43　(9B)　6721-6724　2004/09

DOI： 10.1143/JJAP.43.6721 　

ISSN： 0021-4922
An evaluation of effective radiuses of bulk-wave ultrasonic transducers as circular piston sources for accurate velocity measurements Peer-reviewed

M Arakawa, J Kushibiki, N Aoki

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　51　(5)　496-501　2004/05

DOI： 10.1109/TUFFC.2004.1320822 　

ISSN： 0885-3010
Development of the LFB ultrasonic material characterization system and its application to LiNbO3 and LiTaO3 single crystals

J. Kushibiki, Y. Ono, I. Takanaga, M. Arakawa, Y. Ohashi

Proc. of The 1st International Symp. on System Construction of Global-Net work-Oriented Information Electronics (IGNOIE-COE03)　43-50　2004/01
Evaluation of pyrex glasses by the line-focus-beam ultrasonic material characterization system Peer-reviewed

Jun-ichi Kushibiki, Mototaka Arakawa, Y. Ohashi

Proc. the 18th International Congress on Acoustics　2　1141-1144　2004
Precise measurements of bulk-wave ultrasonic velocity dispersion and attenuation in solid materials in the VHF range Peer-reviewed

J Kushibiki, R Okabe, M Arakawa

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA　113　(6)　3171-3178　2003/06

DOI： 10.1121/1.1568756 　

ISSN： 0001-4966
High-accuracy standard specimens for the line-focus-beam ultrasonic material characterization system Peer-reviewed

J Kushibiki, M Arakawa, R Okabe

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　49　(6)　827-835　2002/06

DOI： 10.1109/TUFFC.2002.1009343 　

ISSN： 0885-3010
Development of the LFB ultrasonic material characterization system and its applications to LiNbO₃ and LiTaO₃ single crystals

J. Kushibiki, Y.Ono, I .Takanaga, M. Arakawa, Y. Ohashi

Proc.International Conference on New Piezoelectric Materials and High Performance Acoustic Wave Device (January 28-29,2002;JSPS 150th Committee on Acoustic Wave Device Technology ,76th Technical Meeting　131-140　2002/01
Development of the line-focus-beam ultrasonic material characterization system Peer-reviewed

J Kushibiki, Y Ono, Y Ohashi, M Arakawa

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　49　(1)　99-113　2002/01

DOI： 10.1109/58.981388 　

ISSN： 0885-3010
Diffraction effects on bulk-wave ultrasonic velocity and attenuation measurements Peer-reviewed

J Kushibiki, M Arakawa

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA　108　(2)　564-573　2000/08

DOI： 10.1121/1.429587 　

ISSN： 0001-4966
Influence of reflected waves from the back surface of thin solid-plate specimen on velocity measurements by line-focus-beam acoustic microscopy Peer-reviewed

J Kushibiki, Y Ohashi, M Arakawa

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　47　(1)　274-284　2000/01

DOI： 10.1109/58.818771 　

ISSN： 0885-3010
Accurate measurements of the acoustical physical constants of LiNbO3 and LiTaO3 single crystals Peer-reviewed

J Kushibiki, Takanaga, I, M Arakawa, T Sannomiya

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　46　(5)　1315-1323　1999/09

DOI： 10.1109/58.796136 　

ISSN： 0885-3010
Precise velocity measurements for thin specimens by line-focus-beam acoustic microscopy Peer-reviewed

J Kushibiki, Y Ohashi, M Arakawa

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　38　(1AB)　L89-L91　1999/01

DOI： 10.1143/jjap.38.L89 　

ISSN： 0021-4922
A method for calibrating the line-focus-beam acoustic microscopy system Peer-reviewed

J Kushibiki, M Arakawa

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　45　(2)　421-430　1998/03

DOI： 10.1109/58.660152 　

ISSN： 0885-3010
Acoustic properties of standard specimen for calibration of the line-focus-beam acoustic microscopy system Peer-reviewed

Mototaka Arakawa, Jun-ichi Kushibiki

World Congress on Ultrasonics 1997 Proc.　104-105　1997/08

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Misc. 292

超音波を用いた生体内音速推定における血管の径と走行角度の影響

森翔平, 荒川元孝, 金井浩

超音波Techno　36　(1)　2024

ISSN： 0916-2410
Ultrasound measurement of propagation velocity of myocardial contractile response to electrical excitation with high locality in transmural direction

小原優, 森翔平, 政氏伸夫, 高野真澄, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Ultrasonic measurement system of luminal surface roughness on carotid artery for early detection of atherosclerosis

山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Estimation of viscoelastic properties by dual ultrasound excitation and displacement measurement method using network analyzer

小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Examination of envelope statistics analysis of M-mode signals for pneumothorax detection

森翔平, TRAN Khoa, 荒川元孝, 荒川元孝, 金井浩, 金井浩, 小野雄

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Estimation of red blood cell aggregation size using backscattering property from numerous scatterers in focal region

武山莉奈, 森翔平, 政氏伸夫, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Phantom experiment to investigate relationship among internal pressure, pushing pressure by probe, and tube cross-sectional shape for ultrasound blood pressure measurement

石川諒, 森翔平, 荒川元孝, 大庭茂男, 小林和人, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2024　2024

ISSN： 1880-7658
Examination of quantitative evaluation method of lung ultrasound for pneumothorax detection

森翔平, TRAN Khoa, 荒川元孝, 金井浩, 小野雄

日本音響学会研究発表会講演論文集(CD-ROM)　2024　2024

ISSN： 1880-7658
Diagnosis of myocardium properties of cardiac wall

金井浩, 金井浩, 森翔平, 森翔平, 高野真澄, 高野真澄, 高野真澄, 高野真澄, 政氏伸夫, 荒川元孝, 荒川元孝

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Quantitative evaluation method for liver fibrosis by multi-Rayleigh model-based statistical analysis of echo envelope

森翔平, 平田慎之介, 荒川元孝, 荒川元孝, 山口匡, 金井浩, 金井浩, 蜂屋弘之

超音波医学 Supplement　51　2024

ISSN： 1881-9311
Spatial frequency analysis of surface roughness on carotid artery measured by ultrasound

山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

ISSN： 1880-7658
Stabilization in measurement of displacement generated by ultrasonic excitation

小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

ISSN： 1880-7658
濃度共起行列によるテクスチャ解析を用いた細胞質内顆粒の自動・定量評価に用いる判別系の検討

政氏伸夫, 三澤(山本)麻衣, 川崎(菅野)加奈絵, 井田晴日, 中村伊織, 藪田麻結, 黒澤(後藤)美沙紀, 森翔平, 荒川元孝, 荒川元孝, 金井浩

日本検査血液学会雑誌　24　2023

ISSN： 1347-2836
高周波超音波プローブを用いた赤血球集合の評価

政氏伸夫, 武山莉奈, 森翔平, 荒川元孝, 荒川元孝, 高野真澄, 高野真澄, 八代諭, 石垣泰, 金井浩

日本検査血液学会雑誌　24　2023

ISSN： 1347-2836
Variance estimation based on multifrequency phase differences of RF echoes in myocardial strain rate measurement

小原優, 森翔平, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　50　2023

ISSN： 1881-9311
In vivo measurement of internal pressure dependence of radial artery viscoelasticity by ultrasound

鈴木沙綺, 森翔平, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　50　2023

ISSN： 1881-9311
過分葉好中球を含む末梢血好中球の自動分類

政氏伸夫, 井田晴日, 中村伊織, 薮田麻結, 森翔平, 荒川元孝, 金井浩

臨床血液　64　(5)　2023

ISSN： 0485-1439
High-speed measurement of two-dimensional displacement of myocardium using received time distribution on elements in ultrasonic probe

原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　50　2023

ISSN： 1881-9311
Investigation of irradiation conditions for low intensity pulsed ultrasound to induce angiogenesis

大内大輝, 森翔平, 荒川元孝, 荒川元孝, 進藤智彦, 下川宏明, 安田聡, 金井浩, 金井浩

超音波医学 Supplement　50　2023

ISSN： 1881-9311
Examination of effect of rotation angle of measured cross-section from short-axis plane of blood vessels on speed-of-sound estimation in liver

森翔平, 小野田啓司, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

ISSN： 1880-7658
An ultrasonic method for measuring small continuous sinusoidal displacements using a network analyzer

小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電子情報通信学会技術研究報告(Web)　123　(214(US2023 37-42))　2023

ISSN： 2432-6380
A preliminary study on sound speed estimation for in vivo application

小野田啓司, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

ISSN： 1880-7658
Ultrasound measurement of instantaneous displacement using cross-correlation of element signals along ideal delay time

原魁星, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

ISSN： 1880-7658
Construction of phantom experimental system simulating in vivo pulsation conditions of carotid artery and evaluation of accuracy of elasticity ultrasound measurement

鈴木沙綺, 森翔平, 荒川元孝, 高野真澄, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

ISSN： 1880-7658
A study on transmission conditions of focused waves for thoracic-spine imaging using differences in ultrasonic reflection and scattering characteristics for in vivo application

阪東泰河, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

ISSN： 1880-7658
Viscoelasticity measurement of arterial wall using single probe aimed for evaluating vascular endothelial function

荒川元孝, 荒川元孝, 庄司悠人, 森翔平, 大庭茂男, 小林和人, 金井浩, 金井浩

超音波医学 Supplement　49　2022

ISSN： 1881-9311
Accurate elasticity measurement of radial artery wall considering change in cross-sectional shape of vessel caused by pushing pressure from ultrasound probe

庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

超音波医学 Supplement　49　2022

ISSN： 1881-9311
Red blood cell aggregate size estimation by using reference scattering power spectrum

東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

超音波医学 Supplement　49　2022

ISSN： 1881-9311
Observation of brightness change distributions in carotid plaque to evaluate reliability of measured elastic modulus

土師佑太, 森翔平, 荒川元孝, 荒川元孝, 山岸俊夫, 金井浩, 金井浩

超音波医学 Supplement　49　2022

ISSN： 1881-9311
Improving Axial Resolution of Medical Ultrasound Images by Noise-Robust Broadband Filter

川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　49　2022

ISSN： 1881-9311
頸動脈の内腔表面粗さ推定のための移動平均による拍動成分推定に関する検討

山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022
赤血球集合度評価を目指した超音波伝播減衰特性のin vivo計測-生体模擬ファントムの減衰係数計測-

武山莉奈, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022
双方向超音波加振用超音波トランスデューサの加振焦点の特定の検討

小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022
High frequency ultrasound / photoacoustic imaging at Tohoku University

西條芳文, 新楯諒, 鈴木陸, 石井琢郎, 荒川元孝, 梅村晋一郎, 吉澤晋, 長岡亮, 小林和人, 根本隆治

超音波医学 Supplement　49　2022

ISSN： 1881-9311
Viscoelasticity of arterial wall measured by ultra- sound Invited

Mototaka Arakawa, Hiroshi Kanai

77　(7)　447-454　2021/07
Conditions for calculating the power spectrum for estimating size of red blood cell aggregate by analyzing ultrasonic backscattering characteristics

東山京平, 深瀬晶予, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Medical ultrasound can visualize response of myocardium to propagation of electric activation during pre-systole

金井浩, 荒川元孝, 森翔平

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Measurement of changes in viscoelasticiy of radial artery during flow-mediated dilation using a single ultrasonic probe-Introduction of blood pressure correction based on pulse transit time method-

庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Filter design considering depth dependence of transfer function in ultrasound measurement system for high resolution observation of myocardial fibers

川又健太, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Influence of displacement of carotid artery along direction perpendicular to ultrasonic beam and deformation of plaque on ultrasonic elasticity modulus measurement

土師佑太, 森翔平, 荒川元孝, 山岸俊夫, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Myocardial strain rate measured using multifrequency phased-tracking method

小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Dependence of transmitted beamwidth on ultrasonic measurement of myocardial minute velocity

菅原佳奈, 原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Estimation method of sound velocity distribution in vivo using the delay time distribution of each element of the ultrasonic probe

中山碧惟, 小野田啓司, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Observation of brightness distribution of intravenous B-mode image for evaluation of the degree of red blood cell aggregation using ultrasound

深瀬晶予, 武山莉奈, 東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Sharp Depiction of Thoracic Spinal Gap Using Difference between Reflection and Scattering Properties of Ultrasound to Assist Epidural Anesthesia

橋本拓実, 阪東泰河, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Accuracy verification of elasticity measurement within visible range of intima-media complex

秋山星来, 鈴木沙綺, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　48　2021

ISSN： 1881-9311
A method for estimating degree of red blood cell aggregation by measuring ultrasonic backscattering characteristics-Estimation of scatterer size using power spectrum measured from a point scatterer-

東山京平, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Relationship between detectable maximum velocity and locality in multifrequency phased-tracking method

小原優, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
A study on transmission conditions of focused waves for thoracic spine imaging using differences in ultrasonic reflection and scattering characteristics

阪東泰河, 森翔平, 金井浩, 大西詠子, 山内正憲, 荒川元孝

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Design of broadband filter based on singular value decomposition considering depth dependence of transfer function in ultrasound measurement system

川又健太, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
Theoretical study on elasticity measurement of radial arterial wall by considering change in cross-sectional shape of vessel from circular shape caused by pushing pressure of ultrasound probe

庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

ISSN： 1880-7658
ファントム実験系における超音波による血管壁の粘弾性計測

鈴木沙綺, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021
血管新生を誘発する低出力パルス超音波の細胞実験における音場計測

大内大輝, 森翔平, 荒川元孝, 荒川元孝, 進藤智彦, 安田聡, 下川宏明, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021
超音波による心筋速度波形計測のための2次元相関を用いた近傍からの成分抑制の検討

原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021
反射体の振幅角度特性におけるディップの形成原因に関する検討

阪東泰河, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021
超音波の媒質内伝播時間以外の遅延時間を考慮した生体内音速推定法に関する検討

小野田啓司, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021
医用超音波超音波を用いた動脈壁弾性率計測法のファントム実験による精度検証

森翔平, 荒川元孝, 金井浩

超音波Techno　33　(6)　2021

ISSN： 0916-2410
Study About Optimal Condition of Transmitted Ultrasonic Beam for Heart Wall Dynamics Measurement

森翔平, 荒川元孝, 金井浩

村田学術振興財団年報　(35)　2021

ISSN： 0919-3383
Comparison of Ultrasound and Photoacoustic Imaging of Cell

SAIJO Yoshifumi, SHINTATE Ryo, KAWAGUCHI Kota, ARAKAWA Mototaka, ISHII Takuro, KANZAKI Makoto, KOBAYASHI Kazuto

日本生体医工学会大会プログラム・抄録集(Web)　60th　2021
Change in velocity waveform of interventricular septum caused by avascularization of coronary artery

金井浩, 小原優, 森翔平, 荒川元孝, 山本裕朗, 諸沢薦, 下川宏明, 高野真澄, 高野真澄

超音波医学 Supplement　48　2021

ISSN： 1881-9311
Multiple Phased-Tracking for Velocity Estimation of Heart Wall

小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電子情報通信学会技術研究報告　119　(374(US2019 70-98))　2020

ISSN： 0913-5685
Evaluation of stability in measurement of red blood cell aggregation using ultrasound

深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Improvement in measurement of contraction response of heart wall by velocity estimation using ultrasound phase difference

小原優, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
A study on the difference between reflection characteristics of the surface structure and scattering characteristics of the point structure for depiction of surface structure for human thoracic vertebral by ultrasound

橋本拓実, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Basic study in ultrasonic elasticity measurement of arterial wall using a phantom experimental system

秋山星来, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Dependence of ultrasonic transmitted beam condition for measurement of myocardial minute velocity

菅原佳奈, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
双方向超音波加振による音響放射力の音場と対象物表面における変位分布の計測

福澤徳美, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
超音波による計測領域を考慮した頸動脈粥腫部位の弾性率の経時変化解析

土師佑太, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
単一プローブによる橈骨動脈壁粘弾性特性計測のための血圧計測におけるパルス伝播時間法の適用

庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
筋線維の高分解能な超音波観察を目指したWiener filterの設計法の検討

川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
超音波後方散乱特性計測による赤血球集合体サイズ推定時における解析条件の検討

東山京平, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
心筋収縮応答の遅延時間計測の高精度化に関する検討

荻野智司, 小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020
A Basic Study on Depiction of Thoracic Spine Based on Difference between Ultrasound Reflection and Scattering Characteristics

橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

電子情報通信学会技術研究報告(Web)　120　(174(US2020 27-42))　2020

ISSN： 2432-6380
Investigation on measurement of myocardial contraction response using multiple-frequency phased-tracking method

小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電子情報通信学会技術研究報告(Web)　120　(174(US2020 27-42))　2020

ISSN： 2432-6380
A basic study on application of pulse transit time method to measurement of viscoelastic properties of radial artery with a single ultrasound probe

庄司悠人, 森翔平, 荒川元孝, 大庭茂男, 小林和人, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Measurements of acoustic field and displacement distribution to estimate anisotropy in viscoelastic properties for an object using dual ultrasound excitation

福澤徳美, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Study on effect of target scatterer sizes in ultrasonic sound velocity estimation

中山碧惟, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Examination on transfer function in Wiener filter for high resolution observation of muscle fiber

川又健太, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Measurable maximal velocity in multiple-frequency phased-tracking for measurement in the heart wall

小原優, 森翔平, 荒川元孝, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Influence on frequency range in estimation of red blood cell aggregated size by analyzing ultrasonic backscattering characteristics

東山京平, 深瀬晶予, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
Theoretical and experimental investigations on ultrasound reflective properties for depicting bone surface to assist epidural anesthesia

橋本拓実, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

ISSN： 1880-7658
頸動脈に形成された粥腫における同一計測領域での経時的な弾性率変化の超音波計測

土師佑太, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

日本栓子検出と治療学会プログラム・抄録集　23rd　2020
超音波を用いた赤血球集合の観察における静脈内輝度分布の短軸像による評価

深瀬晶予, 東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

日本栓子検出と治療学会プログラム・抄録集　23rd　2020
Multiple Phased-Tracking for Local Velocity Estimation of Heart Wall

小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Measurements of acoustic field and displacement distribution caused by acoustic radiation force generated by dual ultrasound excitation

荒川元孝, 荒川元孝, 川村響, 福澤徳美, 森翔平, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Accuracy verification of ultrasonic measurement method of arterial wall elastic modulus

秋山星来, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Analysis of elasticity change in carotid artery atheroma by ultrasonic measurement

土師佑太, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Temporal changes measurements of viscoelastic properties in radial artery wall using a single ultrasonic probe

庄司悠人, 斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Accurate estimation of longitudinal movement in carotid arterial wall

森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Estimation of anisotropic viscoelasticity by dual ultrasound excitation

福澤徳美, 川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Ultrasonic measurement of luminal surface roughness of carotid artery-Improvement of estimation accuracy of removal pulsation component-

北爪聡一郎, 木村元幸, 阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Evaluation of stability in measurement of red blood cell aggregation using ultrasound

深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
High resolution observation of striated muscle fiber~wider bandwidth based on Wiener filter~

川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Measurement of Attenuation Component by Analyzing Ultrasonic Backscatter for Evaluation of Red Blood Cell Aggregation

東山京平, 永澤幹太, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Measurement of Ultrasonic Reflection and Scattering Characteristics of Ultrasound for Epidural Anesthesia with Medical Ultrasound

橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Ultrasonic measurement detects propagation of electrical excitation and difference in propagation velocity of myocardial response in pre-ejection phase for longitudinal and radial components

金井浩, 金井浩, 森翔平, 荒川元孝, 荒川元孝

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Experimental determination of optimal condition of ultrasonic transmitted beam to measure myocardial minute velocity

菅原佳奈, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Depiction of thoracic spine based on the difference between ultrasound reflection and scattering characteristics on bone and muscle tissue for epidural anesthesia

荒川元孝, 荒川元孝, 橋本拓実, 森翔平, 大西詠子, 山内正憲, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Development of generalized coherence factor with reduced computational complexity

久津将則, 久津将則, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
Estimation method of sound velocity distribution in vivo for quantitative fatty liver diagnosis

中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学 Supplement　47　2020

ISSN： 1881-9311
超音波プローブを用いた血圧と血管径の同時計測法に関する検討

斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

圧電材料・デバイスシンポジウム　2019　2019
超音波計測による頸動脈内腔表面粗さ推定の精度向上に関する検討-拍動成分の除去-

阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

ISSN： 1880-7658
単一超音波プローブを用いた血圧-血管径同時計測の再現性に関する検討

斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

ISSN： 1880-7658
超音波後方散乱特性解析による超音波伝搬減衰を考慮した赤血球集合度の評価方法に関する検討

永澤幹太, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

ISSN： 1880-7658
双方向超音波加振により発生する変位の計測精度に関する検討

川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

ISSN： 1880-7658
Improvement in estimation accuracy of luminal surface roughness of carotid artery by ultrasonic measurement-examination on the elimination method of pulsatile components of blood vessel-

阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電子情報通信学会技術研究報告　119　(211(US2019 46-56))　2019

ISSN： 0913-5685
超音波を用いた音速分布推定における散乱体サイズの影響の理論的考察

中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019
超音波を用いた赤血球集合観察方法の安定化に関する検討

深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019
心臓壁における超音波の位相を用いた微小速度推定

小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019
動脈壁弾性率の超音波計測に関する血管模擬ファントムを用いた検討

秋山星来, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019
超音波によるヒト胸椎描出を目指した面構造からの受信波形の模擬

橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019
超音波計測を用いた動脈壁の同部位における弾性率変化の経時的観察

森翔平, 土師佑太, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

日本栓子検出と治療学会プログラム・抄録集　22nd　2019
超音波による赤血球集合度と血糖値との相関に関する検討

深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

日本栓子検出と治療学会プログラム・抄録集　22nd　2019
ヒト心臓壁を対象にした超音波による心筋収縮の伝播速度ベクトルの空間分布推定

林あかね, 小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
心臓壁振動速度波形の超音波計測精度の送信ビーム幅依存性評価を目指した基礎検討

古澤直也, 菅原佳奈, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
超音波断層像の画質向上と脂肪肝診断を目指した音速分布推定

阿部啓一郎, 中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
心臓壁の動態計測における最適な超音波ビーム送信条件の評価

森翔平, 古澤直也, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
超音波計測による動脈壁弾性率の経時変化における計測部位の影響

岩森光司, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
生体組織の微小速度・変形の超音波による高精度な定量評価

金井浩, 荒川元孝, 森翔平

超音波医学　46　(Supplement (CD-ROM))　2019

ISSN： 1346-1176
鉄-アルミニウム系合金結晶の形状制御作製と磁気特性評価

鎌田圭, 鎌田圭, 村上力輝斗, 荒川元孝, 南谷保, 上野敏幸, 庄子育宏, 庄子育宏, 山路晃広, 吉野将生, 吉野将生, 黒澤俊介, 横田有為, 大橋雄二, 吉川彰, 吉川彰, 吉川彰

応用物理学会春季学術講演会講演予稿集(CD-ROM)　66th　2019
Development of an ultrasonic probe aimed at early diagnosis of arteriosclerosis

荒川元孝, 金井浩

応用物理　88　(11)　2019

ISSN： 0369-8009
超音波顕微鏡による生体試料の音響特性の解析方法の検討 −ロバストな解析方法を目指して−

荒川元孝, 森翔平, 金井浩, 堀江みき, 西條芳文, 長岡亮, 小林和人

超音波テクノ（日本工業出版）　30　(6)　26-32　2018/11
心臓の高時間分解能超音波計測における送信平面波の有効幅の検討

古澤直也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

日本音響学会研究発表会講演論文集(CD-ROM)　2018　2018

ISSN： 1880-7658
双方向超音波加振により生体模擬試料表面に発生する変位分布の計測

川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018
頸動脈表面粗さの超音波計測における超音波プローブに対する頸動脈の傾斜の影響除去に関する検討

阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018
超音波後方散乱特性解析による赤血球集合度評価法の超音波伝播減衰除去に関する検討

永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018
血管壁粘弾性評価のための単一超音波プローブを用いた橈骨動脈の血管径と血圧の同時計測に関する検討

斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018
In vivo estimation of sound velocity distribution for diagnosis of fatty liver disease and high resolution of tomographic imaging using ultrasound

阿部啓一郎, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

電子情報通信学会技術研究報告　118　(229(US2018 49-62))　2018

ISSN： 0913-5685
多数点で超音波計測した頸動脈壁振動解析による局所脈波伝播速度の算出

伊藤未夏, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

超音波医学　45　(Supplement (CD-ROM))　2018

ISSN： 1346-1176
直線集束ビーム超音波材料解析システムによる圧電性Ta₂O₅薄膜の評価

末永凌大, 鈴木雅視, 垣尾省司, 大橋雄二, 荒川元孝, 櫛引淳一

応用物理学会春季学術講演会講演予稿集(CD-ROM)　65th　2018
直線集束ビーム超音波材料解析システムによるSiO₂薄膜装荷36°YカットLiTaO₃の評価

末永凌大, 鈴木雅視, 垣尾省司, 大橋雄二, 荒川元孝, 櫛引淳一

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　79th　2018
Analysis of Ultrasonic Scattering Characteristics for Diabetics Focusing on Red Blood Cell Aggregation

117　(227)　1-4　2017/10/05
Publisher: 電子情報通信学会
ISSN： 0913-5685
Analysis of pulse wave velocity by ultrasonic instantaneous measurement of small vibrations at multiple points on arterial wall

117　(227)　17-20　2017/10/05
Publisher: 電子情報通信学会
ISSN： 0913-5685
Ultrasonic Measurement of Propagation of Myocardial Contraction Response in Interventricular Septum

117　(227)　21-26　2017/10/05
Publisher: 電子情報通信学会
ISSN： 0913-5685
超音波マイクロスペクトロスコピー技術によるCa₃Ta(Ga,Al)₃Si₂O₁₄単結晶の均質性評価

大橋雄二, 荒川元孝, 横田有為, 庄子育宏, 山路晃広, 黒澤俊介, 鎌田圭, 鎌田圭, 吉川彰, 吉川彰, 吉川彰

圧電材料・デバイスシンポジウム　2017　2017
水負荷圧電基板上の漏洩弾性表面波の伝搬特性

末永凌大, 鈴木雅視, 垣尾省司, 大橋雄二, 荒川元孝, 櫛引淳一

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　78th　2017
改良型マイクロ引き下げ法によるCe:Cs₂LiYCl₆単結晶の育成と評価

伊藤友樹, 横田有為, 黒澤俊介, 黒澤俊介, 鎌田圭, 鎌田圭, 大橋雄二, 荒川元孝, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
Ca₃Ta(Ga,R)₃Si₂O₁₄単結晶育成と圧電特性評価

五十嵐悠, 大橋雄二, 大橋雄二, 横田有為, 荒川元孝, 井上憲司, 山路晃広, 庄子育宏, 庄子育宏, 鎌田圭, 鎌田圭, 鎌田圭, 黒澤俊介, 吉川彰, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
マイクロ引き下げ法によるIrおよびPtファイバー育成と組織観察

横田有為, 二瓶貴之, 鎌田圭, 鎌田圭, 大橋雄二, 荒川元孝, 黒澤俊介, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
Na添加Cs₂HfCl₆シンチレータ単結晶の育成と発光特性評価

小玉翔平, 黒澤俊介, 堀合毅彦, 山路晃広, 横田有為, PEJCHAL Jan, 大橋雄二, 荒川元孝, 鎌田圭, 鎌田圭, NIKL Martin, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
Ca₃Nb(Ga,Al)₃Si₂O₁₄単結晶の音響特性に対するAl置換量依存性

大橋雄二, 大橋雄二, 荒川元孝, 横田有為, 井上憲司, 山路晃広, 黒澤俊介, 鎌田圭, 鎌田圭, 鎌田圭, 吉川彰, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
Ce:La-GPS結晶の弾性定数決定に関する検討

荒川元孝, 大橋雄二, 大橋雄二, 村上力輝斗, 村上力輝斗, 井上憲司, 庄子育宏, 庄子育宏, 横田有為, 山路晃広, 黒澤俊介, 鎌田圭, 鎌田圭, 鎌田圭, 吉川彰, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
ハフニウム塩化物系シンチレータの開発とその現状

黒澤俊介, 小玉翔平, 山路晃広, 横田有為, 大橋雄二, 荒川元孝, 鎌田圭, 鎌田圭, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
Ce賦活(Gd,La)₂Si₂O₇シンチレータのY置換効果

堀合毅彦, 黒澤俊介, 村上力輝斗, 庄子育宏, 庄子育宏, 山路晃広, 大橋雄二, 荒川元孝, 鎌田圭, 鎌田圭, 横田有為, 石津智洋, 大石保生, 中谷太亮, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
酸化物シンチレータの放射線耐性実験

黒澤俊介, 山路晃広, 堀合毅彦, 村上力輝斗, 小玉翔平, 庄子育宏, 庄子育宏, 大橋雄二, 荒川元孝, 鎌田圭, 鎌田圭, 横田有為, 吉川彰, 吉川彰, 吉川彰

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　2016
SPS法によるシンチレータ材料の開発 VI

黒澤俊介, 原田晃一, 知場啓志, 山路晃広, 荒川元孝, 大橋雄二, 鎌田圭, 横田有為, 吉川彰

日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)　29th　2016
Crystal growth by μ-PD method and evaluation of Ca₃Ta(Ga,Sc)₃Si₂O₁₄ single crystals

五十嵐悠, 大橋雄二, 庄子育宏, 山路晃広, 吉川彰, 横田有為, 荒川元孝, 鎌田圭, 黒澤俊介

Journal of Flux Growth　11　(2)　2016

ISSN： 1881-5316
Homogeneity Evaluation of Ca₃Ta(Ga,Al)₃Si₂O₁₄ Single Crystals by the Ultrasonic Microspectroscopy Technology

大橋雄二, 庄子育宏, 山路晃広, 吉川彰, 荒川元孝, 横田有為, 鎌田圭, 黒澤俊介

Journal of Flux Growth　11　(2)　2016

ISSN： 1881-5316
金属線材向けマイクロ引き下げ法によるPtファイバーの育成

二瓶貴之, 横田有為, 荒川元孝, 大橋雄二, 黒澤俊介, 鎌田圭, 鎌田圭, 吉川彰, 吉川彰, 吉川彰

日本金属学会講演概要(CD-ROM)　159th　2016

ISSN： 2433-3093
頸動脈壁の粘弾性計測に関する検討

R. Nagaoka, M. Arakawa, S. Yoshizawa, S. Umemura, Y. Saijo, K. Kobayashi

超音波テクノ　28　(3)　10-14　2016
Publisher: 日本工業出版
ISSN： 0916-2410
2P2-9 Characterization of Compressive Stress Layer of Chemically Tempered Glasses by the Ultrasonic Microspectroscopy Technology

Arakawa Mototaka, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　36　"2P2-9-1"-"2P2-9-2"　2015/11/05
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, we clarified that the compressive stress layer of the chemically tempered glass was stiffened structure by measuring the bulk acoustic properties by the UMS technology.
基板付き圧電薄膜のk_t評価法の比較-共振反共振法,共振スペクトル法および変換損失による方法-

小林勇太, 鈴木雅視, 柳谷隆彦, 荒川元孝, 大橋雄二

圧電材料・デバイスシンポジウム　2015　2015
3P5-19 A Basic Study of Intrinsic Elastography Based on Propagation Velocity Distribution Induced by Artery Pulsation(Poster Session)

Nagaoka Ryo, Iwasaki Ryosuke, Arakawa Mototaka, Kobayashi Kazuto, Yoshizawa Shin, Umemura Shin-ichiro, Saijo Yoshifumi

Proceedings of Symposium on Ultrasonic Electronics　35　545-546　2014/12/03
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
A Basic Study of Visualization of Propagation Velocity Distribution Induced by Arterial Pulsation

Nagaoka Ryo, Arakawa Mototaka, Kobayashi Kazuto, Yoshizawa Shin, Umemura Shin-ichiro, Saijo Yoshifumi

The Computational Mechanics Conference　2014　(27)　362-363　2014/11/22
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-026X
超音波マイクロスペクトロスコピー技術による強化ガラスの表面応力評価法の検討

荒川元孝, 櫛引淳一, 大橋雄二, 川口邦子, 竹田宣生

圧電材料・デバイスシンポジウム　2014　2014
パルスエコー法と共振法を併用した三方晶系点群32結晶の音響関連物理定数の温度係数測定法の検討

大橋雄二, 荒川元孝, 櫛引淳一, 安達正利

圧電材料・デバイスシンポジウム　2014　2014
直線集束ビーム超音波材料解析システムによる強化ガラスの表面応力評価法の検討

荒川元孝, 櫛引淳一, 大橋雄二, 川口邦子, 竹田宣生

応用物理学会春季学術講演会講演予稿集(CD-ROM)　61st　2014
三方晶系点群32結晶の音響関連物理定数の温度係数測定法の検討

大橋雄二, 荒川元孝, 櫛引淳一, 安達正利

応用物理学会春季学術講演会講演予稿集(CD-ROM)　61st　2014
ランガサイト型単結晶の音響関連物理定数と温度係数決定法

大橋雄二, 荒川元孝, 櫛引淳一, 安達正利

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　75th　2014
超音波マイクロスペクトロスコピー技術による強化ガラスの表面応力層の評価方法の検討

荒川元孝, 櫛引淳一, 大橋雄二, 川口邦子, 竹田宣生

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　75th　2014
1P2-22 Evaluation of TiO_2-SiO_2 Glass Thin Films by the Line-Focus-Beam Ultrasonic Material Characterization System(Poster Session)

Arakawa Mototaka, Ohashi Yuji, Ishikawa Kazuo, Kobayashi Eriko, Kushibiki Jun-ichi, Kakio Shoji, Hosaka Keiko

Proceedings of Symposium on Ultrasonic Electronics　34　79-80　2013/11/20
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, TiO_2-SiO_2 glass thin films were evaluated by the LFB-UMC system. We demonstrated that the CTE characteristics of TiO_2-SiO_2 glass thin films could be controlled with C(TiO_2) of targets and substrate temperatures.
1J2-7 Ultrasonic Microspectroscopy of Tempered Glasses(Measurement Techniques, Imaging, Nondestructive Evaluation 3)

Kushibiki Jun-ichi, Arakawa Mototaka, Ohashi Yuji, Kawaguchi Kuniko, Takeda Nobuo

Proceedings of Symposium on Ultrasonic Electronics　34　171-172　2013/11/20
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, an evaluation method of tempered glasses using UMS technology is discussed. We demonstrated that the depth of compressive stress layer of tempered glass could be evaluated by the leaky surface acoustic wave velocities measurements. This method could be also applied for physically tempered glasses.
超音波マイクロスペクトロスコピー技術による超低膨張セラミックスの均質性評価

大橋雄二, 櫛引淳一, 荒川元孝, 佐々木俊, 井口真仁

応用物理学会春季学術講演会講演予稿集(CD-ROM)　60th　2013
超音波マイクロスペクトロスコピー技術によるTiO₂-SiO₂超低膨張ガラスのゼロCTE温度評価法

櫛引淳一, 荒川元孝, 大橋雄二, 山田修史

応用物理学会春季学術講演会講演予稿集(CD-ROM)　60th　2013
超音波マイクロスペクトロスコピー技術によるTiO₂-SiO₂超低膨張ガラスの線膨張係数評価法

荒川元孝, 大橋雄二, 櫛引淳一

圧電材料・デバイスシンポジウム　2013　2013
超音波マイクロスペクトロスコピー技術による合成粉溶融石英ガラスの均質性評価-OH濃度と仮想温度の関係-

荒川元孝, 大橋雄二, 小林恵理子, 櫛引淳一, 堀越秀春, 森山賢二

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　74th　2013
Determination Method of Acoustical Physical Constants and Their Temperature Coefficients of La_3Ta_<0.5>Ga_<5.3>Al_<0.2>O_<14> Single Crystal

OHASHI Yuji, KARAKI Tomoaki, YOSHIDA Hitoshi, LV Tao, ARAKAWA Mototaka, ADACHI Masatoshi, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　112　(186)　23-26　2012/08/20
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We proposed a determination method of accurate acoustical physical constants and their temperature coefficients for La_3Ta_<0.5>Ga_<5.3>Al_<0.2>O_<14> (LTGA) single crystal using the ultrasonic microspectroscopy (UMS) technology combined with the resonance method. Acoustic properties were measured at 20, 23, and 26℃ by the UMS system for X-, Y-, Z-, 29.14°Y-, and 150.86°Y-cut specimens prepared from an LTGA ingot. Using the measured results (longitudinal- and shear-wave velocities, dielectric constants, density, and thermal expansion coefficients), we determined acoustical physical constants and their temperature coefficients around room temperatures. To confirm the accuracy of the determined constants, we compared the measured LSAW velocities and calculated ones using the determined constants at 23℃, resulting in good agreement within -3.0 to 1.1 m/s for all propagation directions. Using four X-cut rotated Y-bar (-30°Y, -15°Y, 0°Y, +30°Y) specimens and Y-cut specimen prepared from the same ingot, we also obtained the temperature coefficients in a range from -30 to +80℃ by the resonance method. Combining the temperature coefficients obtained by the resonance method with the absolute values of constants obtained by the UMS technology, we can determine more reliable constants and temperature coefficients.
La₃Ta_0.5Ga_5.3Al_0.2O₁₄単結晶の音響関連物理定数の高温測定

唐木智明, LV T., 安達正利, 大橋雄二, 荒川元孝, 櫛引淳一

圧電材料・デバイスシンポジウム　2012　2012
超音波マイクロスペクトロスコピー技術によるTiO₂-SiO₂超低膨張ガラスの評価-仮想温度依存性-

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 山田修史

圧電材料・デバイスシンポジウム　2012　2012
超音波マイクロスペクトロスコピー技術によるSiO₂ガラスインゴットの光学特性評価

荒川元孝, 大橋雄二, 丸山由子, 貝賀俊介, 櫛引淳一, 森山賢二, 堀越秀春

圧電材料・デバイスシンポジウム　2012　2012
超音波ゼロCTE温度評価システムによるTiO₂-SiO₂超低膨張ガラスの評価-仮想温度依存性-

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 山田修史

応用物理学関係連合講演会講演予稿集(CD-ROM)　59th　2012
超音波マイクロスペクトロスコピー技術による合成石英ガラスの屈折率評価

荒川元孝, 大橋雄二, 丸山由子, 貝賀俊介, 櫛引淳一, 森山賢二, 堀越秀春

応用物理学関係連合講演会講演予稿集(CD-ROM)　59th　2012
超音波マイクロスペクトロスコピー技術によるVAD法SiO₂ガラスインゴットの均質性評価

櫛引淳一, 荒川元孝, 大橋雄二, 貝賀俊介, 堀越秀春, 森山賢二

応用物理学関係連合講演会講演予稿集(CD-ROM)　59th　2012
超音波マイクロスペクトロスコピー技術によるVAD法SiO₂ガラスインゴットの均質性評価

櫛引淳一, 荒川元孝, 大橋雄二, 貝賀俊介, 堀越秀春, 森山賢二

日本音響学会研究発表会講演論文集(CD-ROM)　2012　2012

ISSN： 1880-7658
超音波マイクロスペクトロスコピー技術によるTiO₂-SiO₂超低膨張ガラスの評価-仮想温度依存性-

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 山田修史

日本音響学会研究発表会講演論文集(CD-ROM)　2012　2012

ISSN： 1880-7658
Evaluation of Silica Glasses by the Ultrasonic Microspectroscopy Technology-Effects of OH and Cl on Fictive Temperature Dependences of Acoustic Properties-

荒川元孝, 大橋雄二, 丸山由子, 櫛引淳一, 堀越秀春, 森山賢二

電子情報通信学会技術研究報告　112　(213(US2012 58-62))　2012

ISSN： 0913-5685
超音波マイクロスペクトロスピー技術によるTiO₂-SiO₂超低膨張ガラスのゼロCTE温度評価

荒川元孝, 大橋雄二, 丸山由子, 櫛引淳一, 山田修史

電気学会電子・情報・システム部門大会講演論文集(CD-ROM)　2012　2012
ランガサイト系圧電単結晶の音響関連物理定数と温度係数の測定

大橋雄二, 吉田斉師, 唐木智明, LV Tao, 荒川元孝, 安達正利, 櫛引淳一

電気学会電子・情報・システム部門大会講演論文集(CD-ROM)　2012　2012
Evaluation of Glass Multilayer Films by the Line-Focus-Beam Ultrasonic Material Characterization System

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi, ITOH Kazuhiko, ETOH Kazuyuki

IEICE technical report　111　(215)　53-57　2011/09/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Multilayer films for optical cavity with ultra-high finesse were evaluated by the line-focus-beam ultrasonic material characterization (LFB-UMC) system. Two SiO_2/Ta_2O_5 multilayer films were deposited on SiO_2 substrates by rf ion beam sputtering, and one of them was annealed. Frequency characteristics of leaky surface acoustic wave (LSAW) velocity were measured for specimens by the LFB-UMC system, and LSAW velocity changes due to the annealing were detected. SiO_2 and Ta_2O_5 single layers were also deposited, and LSAW velocities were measured by the LFB-UMC system. It was found that elastic constant, density, and light transmittance changes of multilayer films caused by annealing were mainly affected by their changes of Ta_2O_5 layers.
超音波マイクロスペクトロスコピー技術による合成石英ガラスインゴットの均質性評価

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 堀越秀春, 森山賢二

圧電材料・デバイスシンポジウム　2011　2011
LFB超音波材料解析システムによるマイクロ波プラズマCVD多結晶ダイヤモンド膜の評価

近藤貴則, 大橋雄二, 荒川元孝, 櫛引淳一, JOSEPH P. T., LIN I-Nan

圧電材料・デバイスシンポジウム　2011　2011
ランガサイト系圧電単結晶の現状とその動向

安達正利, 唐木智明, 大橋雄二, 荒川元孝, 櫛引淳一

圧電材料・デバイスシンポジウム　2011　2011
高周波スパッタリング法により作製されたアモルファスTa₂O₅薄膜の音響特性評価

垣尾省司, 保坂桂子, 荒川元孝, 大橋雄二, 櫛引淳一

圧電材料・デバイスシンポジウム　2011　2011
超音波マイクロスペクトロスコピー技術による合成石英ガラスインゴットの均質性評価

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 堀越秀春, 森山賢二

応用物理学関係連合講演会講演予稿集(CD-ROM)　58th　2011
Homogeneity Evaluation of a Synthetic Silica Glass Ingot by the Ultrasonic Microspectroscopy Technology

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 堀越秀春, 森山賢二

電子情報通信学会技術研究報告　110　(366(US2010 92-111))　2011

ISSN： 0913-5685
LFB超音波材料解析システムによるマイクロ波プラズマCVD多結晶ダイヤモンド膜の評価

近藤貴則, 大橋雄二, 荒川元孝, 櫛引淳一, JOSEPH P.T., LIN I-Nan

日本音響学会研究発表会講演論文集(CD-ROM)　2011　2011

ISSN： 1880-7658
超音波マイクロスペクトロスコピー技術による合成石英ガラスインゴットの均質性評価

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 堀越秀春, 森山賢二

日本音響学会研究発表会講演論文集(CD-ROM)　2011　2011

ISSN： 1880-7658
La₃Ta_0.5Ga_5.3Al_0.2O₁₄単結晶の音響関連物理定数

大橋雄二, 唐木智明, LV Tao, 荒川元孝, 安達正利, 櫛引淳一

日本音響学会研究発表会講演論文集(CD-ROM)　2011　2011

ISSN： 1880-7658
LFB超音波材料解析システムよるマイクロ波プラズマCVD多結晶ダイヤモンド膜の評価

近藤貴則, 大橋雄二, 荒川元孝, 櫛引淳一, JOSEPH P. T., LIN I-Nan

応用物理学関係連合講演会講演予稿集(CD-ROM)　58th　2011
高周波スパッタリング法により作製されたアモルファスTa₂O₅薄膜の音響特性評価

垣尾省司, 保坂桂子, 荒川元孝, 大橋雄二, 櫛引淳一

応用物理学関係連合講演会講演予稿集(CD-ROM)　58th　2011
超音波マイクロスペクトロスコピー技術による合成石英ガラスインゴットの仮想温度分布評価

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 貝賀俊介, 堀越秀春, 森山賢二

応用物理学会学術講演会講演予稿集(CD-ROM)　72nd　2011
アモルファスTa₂O₅薄膜の音響関連物理定数の成膜条件依存性

垣尾省司, 保坂桂子, 荒川元孝, 大橋雄二, 櫛引淳一

電子情報通信学会大会講演論文集　2011　2011

ISSN： 1349-1369
Fictive-Temperature Evaluation of Synthetic Silica Glass Ingots by the Ultrasonic Microspectroscopy Technology

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 貝賀俊介, 堀越秀春, 森山賢二

電子情報通信学会技術研究報告　111　(215(US2011 46-57))　2011

ISSN： 0913-5685
Evaluation of Acoustic Properties of Amorphous Ta₂O₅ Thin Film Prepared by RF Sputtering

垣尾省司, 保坂桂子, 荒川元孝, 大橋雄二, 櫛引淳一

電子情報通信学会技術研究報告　111　(215(US2011 46-57))　2011

ISSN： 0913-5685
アモルファスTa₂O₅薄膜の音響関連物理定数の成膜条件依存性

垣尾省司, 保坂桂子, 荒川元孝, 大橋雄二, 櫛引淳一

日本音響学会研究発表会講演論文集(CD-ROM)　2011　2011

ISSN： 1880-7658
TiO₂-SiO₂ Ultra-Low-Expansion Glasses for EUVL System Evaluated by Ultrasonic Zero-CTE Temperature Measurement System

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子

電子情報通信学会技術研究報告　111　(311(US2011 65-76))　2011

ISSN： 0913-5685
2E-7 Measurements of Acoustical Physical Constants and Their Temperature Coefficients of La_3Ta_<0.5>Ga_<5.3>Al_<0.2>O_<14> Single Crystal(Physical Acoustics & Nonlinear & High-power Ultrasound, Sonochemistry)

Ohashi Yuji, Karaki Tomoaki, Lv Tao, Arakawa Mototaka, Adachi Masatoshi, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　31　425-426　2010/12/06
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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We proposed a method for determining accurate acoustical physical constants at wide temperature range by combining the resonance method with the UMS technology taking LTGA single crystal. Obtaining the accurate constants and their temperature coefficients by the UMS technology even for narrow temperature range around room temperature, we demonstrated that we were able to calibrate the resonance method and to conduct more reliable determination of constants.
1Pb-24 Characterization of Polycrystalline Diamond Films by the LFB Ultrasonic Material Characterization System(Poster Session)

Kondo Takanori, Ohashi Yuji, Arakawa Mototaka, Kushibiki Jun-ichi, Fujii Satoshi, Joseph P. T., Lin I-Nan

Proceedings of Symposium on Ultrasonic Electronics　31　189-190　2010/12/06
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, we tried to characterize polycrystalline diamond films fabricated on Si substrates by two methods, through the measurements of the frequency dependences of LSAW velocity and attenuation by the LFB-UMC system. In the results, we observed significant differences in velocity and attenuation caused by the fabrication methods and conditions. In the near future, we will discuss the effects of polycrystalline structure on elastic constants and those of nano-grain size on scattering by preparing UNCD films with denser structure.
Acoustical Physical Constants of La_3Ta_<0.5>Ga_<5.3>Al_<0.2>O_<14> Single Crystal

OHASHI Yuji, KARAKI Tomoaki, LV Tao, ARAKAWA Mototaka, ADACHI Masatoshi, KUSHIBIKI Jun-ichi

IEICE technical report　110　(213)　69-74　2010/09/22
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We measured accurate acoustical physical constants and their temperature coefficients for La_3Ta_<0.5>Ga_<5.3>Al_<0.2>O_<14> (LTGA) single crystal using the ultrasonic microspectroscopy (UMS) technology combined with the resonance method. Acoustic properties were measured at 20, 23, and 26℃ by the UMS system for X-, Y-, Z-, 29.14°Y-, and 150.86°Y-cut specimens prepared from an LTGA ingot. Using the measured results (longitudinal- and shear-wave velocities, dielectric constants, density, and thermal expansion coefficients), we determined acoustical physical constants and their temperature coefficients around room temperatures. To confirm the accuracy of the determined constants, we compared the measured LSAW velocities and calculated ones using the determined constants at 23℃, resulting in good agreement within -3.0 to 1.1m/s for all propagation directions. Using four X-cut rotated Y-bar (-30°Y, -15°Y, 0°Y, +30°Y) specimens and Y-cut specimen prepared from the same ingot, we also obtained the temperature coefficients in a range from -30 to +80℃+ by the resonance method. These temperature coefficients were corrected with the accurate ones obtained by the UMS technology even for a narrow temperature range around room temperature. Through this method proposed, we believe that more reliable constants and temperature coefficients can be obtained in a desired temperature range.
Determination of acoustical physical constants of ZnO single crystals by the ultrasonic microspectroscopy technology

IEICE technical report　109　(388)　123-128　2010/01/25
Publisher: 電子情報通信学会
ISSN： 0913-5685
LFB超音波材料解析システムによる石英ガラス上のZnO多結晶薄膜の評価

近藤貴則, 吉田翔, 高麗友輔, 大橋雄二, 荒川元孝, 櫛引淳一, 藤井知

応用物理学関係連合講演会講演予稿集(CD-ROM)　57th　2010
直線集束ビーム超音波材料解析システムを用いた光周波数標準用均質化TiO₂-SiO₂超低膨張ガラスの評価-ゼロCTE温度の制御-

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 吉田翔, 近藤貴則, 山田修史

応用物理学会学術講演会講演予稿集(CD-ROM)　71st　2010
Measurement of Propagation Characteristics of Leaky Surface Acoustic Waves for Lossy Specimen by the LFB Ultrasonic Material Characterization System

近藤貴則, 大橋雄二, 荒川元孝, 櫛引淳一

電子情報通信学会技術研究報告　110　(213(US2010 48-69))　2010

ISSN： 0913-5685
Evaluation of Fictive Temperature of Synthetic Silica Glasses by the Ultrasonic Microspectroscopy Technology

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 近藤貴則, 吉田哲男

電子情報通信学会技術研究報告　110　(213(US2010 48-69))　2010

ISSN： 0913-5685
EUVL用TiO₂-SiO₂超低膨張ガラスのゼロCTE温度精密測定用超音波計測システムの開発

櫛引淳一, 荒川元孝, 大橋雄二, 三野宮利男, 丸山由子

応用物理学会学術講演会講演予稿集(CD-ROM)　71st　2010
超音波マイクロスペクトロスコピー技術による合成石英ガラスの仮想温度評価法

櫛引淳一, 荒川元孝, 大橋雄二, 丸山由子, 近藤貴則, 吉田哲男

ガラスおよびフォトニクス材料討論会講演要旨集　51st　2010
3J1-3 Evaluation of 4H-SiC single crystals using the ultrasonic microspectroscopy technology(Physical Acoustics, Acousto-Optics)

Kushibiki Jun-ichi, Ohashi Yuji, Arakawa Mototaka, Kourai Yuusuke, Kato Tomohisa, Okumura Hajime

Proceedings of Symposium on Ultrasonic Electronics　30　413-414　2009/11/18
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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The ultrasonic microspectroscopy (UMS) technology was applied to evaluation of 4H-SiC single crystals. We prepared six specimens with two (001)-plane substrates, two (110)-plane substrates, a (114) 7° off plane substrate, and a polyhedron block cut from crystal ingot grown by sublimation method. Significant differences between measured and published velocities of bulk waves and leaky surface acoustic waves were observed for all propagation directions and modes. Using measured bulk wave velocities, we determined elastic constants and density of this crystal exhibiting a few percent differences from the published constants. We suggested that this UMS technology had an ability to detect and evaluate the effects of the typical defects in SiC single crystals such as poly-type inclusions and micropipes.
1J2-4 Evaluation of Elastic Inhomogeneity in ZnO Crystals by Means of the Micro-LFB Ultrasonic Material Characterization System(Measurement techniques, Imaging, Nondestructive evaluation II)

Yoshida Sho, Ohashi Yuji, Arakawa Mototaka, Kushibiki Jun-ichi, Sakagami Noboru

Proceedings of Symposium on Ultrasonic Electronics　30　191-192　2009/11/18
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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We evaluated elastic homogeneities of ZnO single crystals by means of a micro-LFB ultrasonic material characterization system with an improved spatial resolution. We prepared four small ZnO single crystal specimens, with (100), (001), and (101) surfaces, grown by the hydrothermal synthesis method. LSAW velocity distributions were measured at 225MHz for each crystalline plane and cross-sectional surfaces of these specimens, resulting in detailed information associated with the crystal growth processes and conditions. This information could be fed back to improvement of the crystal quality. We also could prepare a standard specimen of YX-ZnO uncoupled with the piezoelectricity for the system calibration.
Evaluation of Elastic Inhomogeneity in ZnO Crystal by Means of the Micro-LFB Ultrasonic Material Characterization System

YOSHIDA Sho, OHASHI Yuji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi, SAKAGAMI Noboru

IEICE technical report　109　(213)　77-82　2009/09/22
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We evaluated ZnO single crystals using a micro-line-focus-beam ultrasonic material characterization (LFB-UMC) system with an improved spatial resolution. We prepared two small ZnO single crystals grown by the hydrothermal synthesis method. Leaky surface acoustic waves (LSAWs) velocity distributions were measured at 225MHz for {001} (c-plane), {100} (m-plane), and {101} (p-plane) of one specimen and cross-sectional surfaces (±c-plane) of the other specimen. For the former specimen, we found the facts that +c- and m-planes are very resistive and p- and -c-planes are very conductive. For the latter specimen, we observed very conductive regions surrounding a very resistive seed crystal and very resistive surface at +c- and m-planes surrounding the conductive regions. The information should reflect changes in growth conditions of ZnO single crystals and will be used for further understanding the crystal growth processes. We also demonstrated that system calibration can easily and stably be made using a standard specimen of YX-ZnO (independent with piezoelectricity).
Measurements of Acoustical Properties of ZnO Single Crystals by the LFB/PW Ultrasonic Material Characterization System

KOURAI Yuusuke, YOSHIDA Sho, OHASHI Yuji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi, SAKAGAMI Noboru

IEICE technical report　109　(213)　83-88　2009/09/22
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We evaluated longitudinal-wave propagation characteristics for a Z-cut ZnO single crystal plate specimen with some resistivity distribution, together with leaky surface acoustic wave (LSAW) velocities measured for evaluation of the resistivities on the specimen surfaces using a line-focus-beam/plane-wave (LFB/PW) ultrasonic material characterization (UMC) system. A slight decrease of LSAW velocities was observed on -Z-plane of the specimen prepared. The corresponding longitudinal-wave propagation characteristics exhibited significant velocity dispersion and attenuation variation associated with distribution of electrical property (resistivity). We removed the -Z face of the specimen by about 0.5mm, in which slightly conductive region should exist, then we measured again LSAW velocities and longitudinal-wave propagation characteristics, resulting in the same LSAW velocities on the -Z-plane surface as those on +Z-plane surface with the high velocity and non-dispersive velocities of longitudinal waves. From the measured longitudinal-wave propagation characteristics, we estimated that the resistivity (1/σ_<33>) of the specimen was about 2×10^4Ωm after removal of the -Z face and those for the removed layer distributed in a range of 2×10^2Ωm to less than 2×10^4Ωm. This demonstration will be useful for establishing our resistivity evaluation method using the LSAW propagation characteristics.
Investigation of Determination Procedures of Acoustical Physical Constants of Class 6mm Single Crystals by the Ultrasonic Microspectroscopy Technology

KUSHIBIKI Jun-ichi, OHASHI Yuji, ARAKAWA Mototaka, TANAKA Tomoya

IEICE technical report　108　(410)　27-32　2009/01/22
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We theoretically and numerically investigated procedures of accurately determining the acoustical physical constants of the piezoelectric hexagonal (class 6mm) crystals using bulk-wave velocities and leaky surface-acoustic-wave (LSAW) velocities by the ultrasonic microspectroscopy (UMS) technology. Taking ZnO as an example, selection of proper propagation modes and directions for eight velocity measurements was discussed for accurate determination of five elastic constants c^E_<11>, c^E_<12>, c^E_<13>,c^E_<33>, and c^E_<44>, and three piezoelectric constants e_<15>, e_<31>, and e_<33>, in addition to measurements of two dielectric constants ε^S_<11> and ε^S_<33> and density ρ. Using only bulk-wave velocities measured for Y-cut, Z-cut, and several rotated Y-cut crystalline plane specimens could provide the best determination accuracies for the constants c^E_<13>, c^E_<33>, e_<31>, and e_<33>, and favorable determination accuracies using several sets of two rotated Y-cut crystalline plane specimens such as (101) and (102). Conductive specimens of (001) and (102) with a resistive (103) specimen made bulk-wave measurements simpler, resulting in much improved determination accuracies. Additional use of LSAW velocity with one conductive (001) specimen enabled simplifying the accurate determination procedures with acceptable accuracy for c^E_<13>. Measurements of bulk-wave velocities and LSAW velocities for only two resistive Y-cut and Z-cut specimens could determine all the constants with some deteriorations in accuracy especially for e_<31> and e_<33>, but this was useful for preliminary determination of the constants for the precious crystals.
1P2a-9 Development of Micro-LFB Ultrasonic Device(Poster Session)

Kushibiki Jun-ichi, Ohashi Yuji, Arakawa Mototaka, Tanaka Tomoya, Yoshida Sho

Proceedings of Symposium on Ultrasonic Electronics　29　61-62　2008/11/11
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
1J2a-1 Measurement model for propagation characteristics of leaky surface acoustic waves by the line-focus-beam ultrasonic material characterization system(Measurement techniques)

Otsu Kenji, Arakawa Mototaka, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　29　15-16　2008/11/11
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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The line-focus-beam ultrasonic material characterization system can perform material characterization by accurately measuring the propagation characteristics (viz., phase velocity V_<LSAW> and attenuation α_<LSAW>) of leaky surface acoustic waves (LSAWs) excited on the water-loaded specimen surface. In the conventional theoretical calculations, water was treated as an ideal fluid and the shear-wave component was not considered for the boundary conditions. In this paper, we studied an exact measurement model of LSAW propagation characteristics for synthetic silica glass and borosilicate glass, considering the shear-wave component in the water-loading effect and viscosities of longitudinal and shear waves for both specimen and water. The calculated results for this advanced measurement model exhibit dispersion for both LSAW velocities and normalized attenuation coefficient factors. This is mainly caused by the effect of shear-wave component of water.
1P2a-1 Evaluation of Synthetic Silica Glasses by the Ultrasonic Microspectroscopy Technology(Poster Session)

Arakawa Mototaka, Shimamura Hideki, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　29　45-46　2008/11/11
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, relationships among acoustic properties, fictive temperatures, and chlorine concentrations were discussed for silica glasses. Hereafter, we will investigate relationships between the acoustic properties and OH concentrations.
Development of Micro-LFB Ultrasonic Device

KUSHIBIKI Jun-ichi, OHASHI Yuji, ARAKAWA Mototaka, TANAKA Tomoya, YOSHIDA Sho

IEICE technical report　108　(212)　7-12　2008/09/25
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A micro line-focus-beam (LFB) ultrasonic device was developed to improve spatial resolution of the LFB ultrasonic material characterization (UMC) system which is capable of quantitatively evaluating various solid materials, including single crystals, by measuring the phase velocity of leaky surface acoustic waves (LSAWs) propagating on a water-loaded specimen surface. A different point from the normal-LFB device was that the micro-LFB device had a cylindrically convex surface with a large curvature radius for fabricating a ZnO-film transducer. We evaluated spatial resolution of the device at 225MHz by measuring focused acoustic fields using a point-focus-beam ultrasonic device as a detecting probe. 3dB-down width of the acoustic fields along unfocused direction (perpendicular to the LSAW propagation direction) was improved to be 0.26mm for the micro-LFB device, as compared with that of 0.92mm for the normal-LFB device. We also verify a capability of anisotropy detection through measurements of angular dependence of LSAW velocities for anisotropic crystal. LSAW velocity distributions measured for a Z-cut ZnO crystal clearly showed that the micro-LFB device could detect velocity variations and inhomogeneities which could not be observed by the normal-LFB device. This device will be useful for characterizing small precious samples.
Evaluation of synthetic silica glasses by the ultrasonic microspectroscopy technology

ARAKAWA Mototaka, SHIMAMURA Hideki, KUSHHIBIKI Jun-ichi

IEICE technical report　108　(212)　13-18　2008/09/25
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Ultrasonic microspectroscopy technology is applied to characterization of synthetic silica glasses. Acoustic properties (longitudinal and shear velocities, leaky surface acoustic wave velocity, and density), coefficient of thermal expansion, fictive temperature, and chlorine concentration were measured, and the relationships among their properties were discussed. The variations in acoustic properties due to fictive temperatures and chlorine concentrations were quantitatively obtained. Longitudinal velocity has highest sensitivities of 5.99(m/s)/℃ and -164wtppm/(m/s)and resolutions of 0.6℃ and 16wtppm for both fictive temperature and chlorine concentration, respectively. The variations in acoustic velocities due to fictive temperature and chlorine concentration are mainly caused by the variations of the elastic constants.
Measurement model for propagation characteristics of leaky surface acoustic waves by the line-focus-beam ultrasonic material characterization system

OTSU Kenji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report　108　(212)　1-5　2008/09/25
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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The line-focus-beam ultrasonic material characterization system can perform material characterization by accurately measuring the propagation characteristics (viz., phase velocity V_<LSAW> and attenuation α_<LSAW>) of leaky surface acoustic waves (LSAWs) excited on the water-loaded specimen surface. In the conventional theoretical calculations, water was treated as an ideal fluid and the shear-wave component was not considered for the boundary conditions. In this paper, we studied an exact measurement model of LSAW propagation characteristics for synthetic silica glass and borosilicate glass, considering the shear-wave component in the water-loading effect and viscosities of longitudinal and shear waves for both specimen and water. The calculated results for this advanced measurement model exhibit dispersion for both LSAW velocities and normalized attenuation coefficient factors. This is mainly caused by the effect of shear velocity of water.
Evaluation of TiO_2-SiO_2 Ultra-Low-Expansion Glass Fabricated by the Soot Method Using the Line-Focus-Beam Ultrasonic Material Characterization System

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, UEDA Tetsuji, FUJINOKI Akira

IEICE technical report　108　(73)　11-16　2008/05/30
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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In this paper, we tried to fabricate a TiO_2-doped SiO_2 (TiO_2-SiO_2) glass ingot by the soot method, and homogenized the glass ingot by the zone-melting method. Homogeneities of the specimens were evaluated by measuring leaky surface acoustic wave (LSAW) velocity using the line-focus-beam ultrasonic material characterization system at 225 MHz. Two-dimensional LSAW velocity distributions having an average velocity of 3304.08 m/s with a maximum velocity difference of 3.85 m/s were measured for a homogenized specimen. Striae were not observed for the specimen. The velocity difference corresponds to 17.0 ppb/K from the sensitivity of the LSAW velocity to the CTE {4.41 (ppb/K)/(m/s)}. However, the velocity distributions excluding the edge parts were within ±1.13 m/s, corresponding to the CTE specification of ±5 ppb/K required for EUVL-grade glass. We also discussed the relationship between LSAW velocities and fictive temperatures by heat-treating a part of the homogenized specimen.
Evaluation of Basic Acoustical Properties of SiC Single Crystals by the Ultrasonic Microspectroscopy Technology

OHASHI Yuji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi, EPELBAUM Boris M., WINNACKER Albrecht

IEICE technical report　107　(494)　25-30　2008/02/26
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Evaluation of basic acoustic properties of 6H-SiC single crystals and determination of their acoustical physical constants were conducted using the ultrasonic microspectroscopy technology. First of all, we theoretically investigated a method of determining the acoustical physical constants of a hexagonal SiC single crystal using only bulk wave velocities. As a result, a procedure determining all the elastic and piezoelectric constants were proposed through measurements of four longitudinal wave velocities and four shear wave velocities using Y-cut, Z-cut and two rotated Y-cut specimens. Next, we prepared Y-cut, Z-cut, (104)-plane, and (105)-plane specimens from 6H-SiC single crystals grown by the physical vapor transport (PVT) method. The leaky surface acoustic wave (LSAW) velocities measured at 225MHz for each specimen were larger than those calculated using published constants by 61 to 99m/s for all propagation directions. The velocities of longitudinal waves and shear waves measured for the range from 50 to 300MHz were larger than those calculated by 118 to 165m/s for longitudinal velocities and by 75 to 148m/s for shear velocities exhibiting no velocity dispersions. Density was measured by the Archimedes principle resulting in 0.05% higher value than the published one. All independent elastic constants and piezoelectric constants were determined from the results obtained above and the published dielectric constants, resulting in the great differences from the published constants by 5% for elastic constant c^E_<13> at the maximum and by 370% for piezoelectric constant e_<33>.
1-01-01 Evaluation of ZnO Single Crystals by Means of the Ultrasonic Microspectroscopy Technology(Ultarasonic properties of materials, Phonon physics)

Tanaka Tomoya, Ohashi Yuji, Arakawa Mototaka, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　28　1-2　2007/11/14
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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We conducted preliminary experiments for developing a new ultrasonic method of evaluating resistivity distributions in ZnO single crystals using the line-beam ultrasonic material characterization system. We measured velocities of leaky surface acoustic waves at 225 MHz on three Z-cut ZnO specimens A, B, and C with low, high, and unknown resistivites. We obtained the great velocity changes of more than 50 m/s from the results of 2616 m/s for specimen A and 2669 m/s for specimen B, and evaluated specimen C with velocity distributions from 2612 m/s around the seed part to 2672 m/s for the outside part associated with the crystal growth, corresponding to the resistivity variations of 1-1000 Ω・m.
1-01P-62 Characterization of AIN Single Crystals by the Ultrasonic Microspectroscopy Technology(Poster session 1)

Ohashi Y., Arakawa M., Kushibiki J., Epelbaum B. M., Winnacker A.

Proceedings of Symposium on Ultrasonic Electronics　28　139-140　2007/11/14
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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Basic acoustic properties of AIN single crystals were eveluated using the line-focus-beam/plane-wave ultrasonic material characterization system. Velocities of leaky surface acoustic waves (LSAWs), longitudinal waves, and shear waves for Y- and Z-cut AIN specimens were measured at around 200 MHz. We obtained the great differences of 1.8% in LSAW velocity, 1.7% in longitudinal velocity, and 2.1% in shear velocity at the maximum as compared with the values calculated using published constants. Elastic constants of cE/<11>, cE/<12>, cE/<44>, and cE/<66>, and piezoelectric constant e_<15> were determined from the obtained bulk velocities, resulting in the great differences from the published constants, especially by 9% for cE/<12> and by 46% for e_<15>.
Ultrasonic Spectroscopy of Silicate Glasses

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, SUZUKI Kouji, ONO Yuu

IEICE technical report　107　(233)　55-60　2007/09/21
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Ultrasonic characterization of silicate glasses was conducted by measuring bulk acoustic properties in the VHF/UHF range. The frequency and temperature dependences of the longitudinal and shear velocities and attenuation coefficients, and the density were measured with high accuracy for eleven kinds of commercial silicate glasses around room temperature. Remarkable changes in the acoustic properties caused by the addition of modifiers into silica glass were observed. For silicate glasses other than silica-titania glass, significant velocity dispersions were observed; the attenuation coefficients are considerably larger, and the slopes of their frequency dependences are gentler as compared with that of pure silica glass. The velocities decrease almost linearly with increasing the concentration of modifiers. The densities increase with increasing the concentration and molecular weight of modifiers. The temperature coefficients of elastic constants decrease from positive to negative with increasing the concentration of modifiers.
Evaluation of ZnO Single Crystals by Means of the Ultrasonic Microspectroscopy Technology

TANAKA Tomoya, OHASHI Yuji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report　107　(233)　49-54　2007/09/21
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We conducted preliminary experiments for developing a new ultrasonic method of evaluating resisitivity distributions in ZnO single crystals using the line-focus-beam ultrasonic material characterization system. We measured velocities of leaky surface acoustic waves (LSAW) at 225 MHz on three Z-cut ZnO specimens A, B, and C with low, high, and unknown resistivities. We obtained the great velocity changes of more than 50 m/s caused by differences in resistivity from the results of 2616 m/s for specimen A and 2669 m/s for specimen B, and evaluated specimen C with velocity distributions from 2612 m/s around the seed part to 2672 m/s for the outside part associated with the crystal growth. To explain the experimental results obtained above, we theoretically investigated relationship between resistivity and velocity of Z-axis-polarized shear wave that was a main particle displacement component of the LSAW. We could estimate resistivities of the three specimens as follows: less than 1Ω・m for specimen A, about 1000Ω・m for specimen B, and over 1-1000Ω・m for specimen C.
Evaluation of AlN Single Crystals and Determination of their Acoustical Physical Constants Using the Line-Focus-Beam/Plane Wave Ultrasonic Material Characterization System

OHASHI Yuji, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi, EPELBAUM Boris M., WINNACKER Albrecht

IEICE technical report　107　(233)　43-48　2007/09/21
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Evaluation of basic acoustic properties of AlN single crystals and determination of their acoustical physical constants were conducted using the line-focus-beam/plane-wave ultrasonic material characterization system. First of all, we theoretically investigated a method of determining the acoustical physical constants of a hexagonal AlN single crystal using only Y- and Z-cut specimens. As a result, a procedure determining all the elastic and piezoelectric constants were proposed through measurements of two longitudinal wave velocities, three shear wave velocities, and three leaky surface acoustic wave (LSAW) velocities. To improve a calibration accuracy of the LSAW velocities, we proposed a calibration method using Y-cut X-propagating LSAW velocity as a reference related to only elastic constants that are determined from only bulk wave velocities for the two specimens. Next, we prepared Y- and Z-cut specimens from freestanding AlN single crystals grown by the physical vapor transport (PVT) method and measured their velocities of LSAWs, longitudinal waves, and shear waves at around 200 MHz. We obtained the great differences of 2.0% for LSAW velocities, 1.7% for longitudinal velocities, and 2.1% for shear velocities at the maximum in comparison with the values calculated using published constants. All independent elastic constants and piezoelectric constants were determined from the obtained bulk and LSAW velocities, resulting in the great differences from the published constants by 9% for C^E_<12> at the maximum and by 67% for e_<31>.
Measurements of Basic Acoustical Properties and Lattice Constants for Diamond Single Crystals

KUSHIBIKI Jun-ichi, OHASHI Yuji, ARAKAWA Mototaka, SHISHITANI Takashi, MOKUNO Yoshiaki, CHAYAHARA Akiyoshi, SHIKATA Shinichi

IEICE technical report　107　(75)　21-26　2007/05/23
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Evaluations of diamond single crystals grown by repetition of the microwave plasma (MP) CVD method on seed (100)-diamond substrates (Type 1b) which were synthesized by the high-pressure/high-temperature (HPHT) method were conducted through measurements of basic acoustic properties and lattice constant. The lattice constant for the MPCVD substrate is smaller than that of the HPHT substrate by about 0.0013%. On the cross section of the MPCVD growth surface including the HPHT seed substrate, the lattice constant exhibits the maximum variation of 0.0018% along the growth direction. From comparison of transmission X-ray topography and peak intensity/full width at half maximum of rocking curves, it is pointed out that the lattice perfection is high at the beginning of the MPCVD growth and becomes low at the latter half of the growth. In measurements of leaky surface acoustic wave (LSAW) velocity using the line-focus-beam ultrasonic material characterization system, on the other hand, no differences can be detected between the HPHT and the MPCVD substrates. Along the MPCVD growth direction, the velocity profile is almost flat being not like the results in the lattice constant although the velocity variations larger than the measurement accuracy (±2σ=±0.049%, σ: standard deviation) are detected.
A-2 Accurate Measurements of Elastic Constants of Sapphire Single Crystal

Arakawa Mototaka, Madani Yasuo, Odagawa Hiroyuki, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　27　3-4　2006/11/15
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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In this paper, accurate measurements of elastic constants of sapphire single crystal are reported. The propagation directions and modes of bulk waves optimal for accurately determining the constants were selected through numerical calculations. Several specimens were prepared from a sapphire single crystal ingot produced by the Bagdasarov method. All of the constants were determined by accurately measuring longitudinal and shear velocities, and density. We clearly detected some significant differences between the measured and published constants. We also confirmed the sign of c_<14> was positive, although it was negative in Wachtman's data.
P3-11 Theoretical study of determining accurate acoustical physical constants of piezoelectric hexagonal single crystals(Poster session 3)

Ohashi Yuji, Arakawa Mototaka, Odagawa Hiroyuki, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　27　395-396　2006/11/15
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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A method of accurately determining acoustical physical constants of piezoelectric hexagonal single crystals (6mm) was theoretically investigated using the line-focus-beam (LFB) / plane-wave (PW) ultrasonic material characterization (UMC) system. Proper combinations of propagation directions and modes that make errors in the determined constants small were selected through calculations using the published constants of A1N, GaN, ZnO, and 6H-SiC. Consequently, we developed the procedure of determining the_constants using only three specimens of Y-, Z-, and rotated Y-cut substrates ((101^^-1) plane for A1N, GaN, ZnO, (101^^-5) plane for 6H-SiC).
Accurate Measurements of Elastic Constants of Sapphire Single Crystals

MADANI Yasuo, ARAKAWA Mototaka, ODAGAWA Hiroyuki, KUSHIBIKI Jun-ichi

IEICE technical report　106　(251)　39-44　2006/09/15
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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In this paper, accurate measurements of elastic constants of sapphire single crystals are reported. The propagation directions and modes of bulk waves optimal for accurately determining the constants were selected through numerical calculations. Several specimens were prepared from sapphire single crystal ingots produced by the Bagdasarov method and the Kyropulos method. All of the constants were determined by accurately measuring longitudinal and shear velocities, and density, using the former crystal. We clearly detected some significant differences between the measured and published constants. We also confirmed the sign of c_<14> was positive, although it was negative in Wachtman's data. Slight but significant differences of longitudinal velocities, densities, elastic constants, and lattice constants were detected between the two crystals.
Longitudinal acoustic property measurement using thin layer multiple interference method in UHF-range and application to aqueous solution of gracious

ODAGAWA Hiroyuki, ARAKARA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report　106　(61)　11-15　2006/05/17
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We have developed a measurement system for UHF-range longitudinal acoustic properties of solid, liquid and biological tissue specimens by a plane-wave ultrasonic material characterization system. Recently, we performed a measurement for solid specimens beyond 1GHz-rangein by making a water coupler layer thin to be several micrometers in order to reduce the propagation attenuation. In this method, signals including interference of ultrasonic waves must be analyzed, because multiple reflections occur in the thin layer (thin layer multiple interference method). This method can apply to the measurement for liquid specimens. In this case, a solid reference material which acoustic properties are known is used. In this paper, we describe a measurement for liquid specimens using the multiple interference method, and demonstrate a measurement for 25-wt% aqueous solution of glucose from 200MHz to 1.6GHz.
LFB超音波材料解析システムによるTiO₂-SiO₂超低膨張ガラスの脈理の評価法-漏洩弾性表面波速度分布の補正方法-

荒川元孝, 大橋雄二, 櫛引淳一

日本音響学会研究発表会講演論文集(CD-ROM)　2006　2006

ISSN： 1880-7658
LFB超音波材料解析システムによる脈理を有するTiO₂-SiO₂超低膨張ガラスの高精度CTE評価法(I)-正確な検量線

荒川元孝, 櫛引淳一, 大橋雄二, 鈴木光二

応用物理学関係連合講演会講演予稿集　53rd　(2)　2006
Theoretical study of determining accurate acoustical physical constants of piezoelectric hexagonal single crystals

大橋雄二, 荒川元孝, 小田川裕之, 櫛引淳一

電子情報通信学会技術研究報告　106　(251(US2006 43-51))　2006

ISSN： 0913-5685
SiC単結晶の高精度音響関連物理定数決定に関する理論的検討

大橋雄二, 荒川元孝, 小田川裕之, 櫛引淳一

日本音響学会研究発表会講演論文集(CD-ROM)　2006　2006

ISSN： 1880-7658
六方晶系圧電単結晶の高精度音響関連物理定数決定に関する理論的検討

大橋雄二, 荒川元孝, 小田川裕之, 櫛引淳一

圧電材料・デバイスシンポジウム　2006　2006
LFB超音波材料解析システムによる脈理を有するTiO₂-SiO₂超低膨張ガラスの高精度CTE評価法(II)-基板内部の脈理形状の解析

大橋雄二, 荒川元孝, 櫛引淳一

応用物理学関係連合講演会講演予稿集　53rd　(2)　2006
LFB超音波材料解析システムによる脈理を有するTiO₂-SiO₂超低膨張ガラスの高精度CTE評価法(III)-測定精度の向上

大橋雄二, 荒川元孝, 櫛引淳一

応用物理学関係連合講演会講演予稿集　53rd　(2)　2006
I-3 Accurate measurement of leaky surface acoustic wave velocity for TiO_2-SiO_2 ultralow expansion glasses by the LFB ultrasonic material characterization system

Ohashi Yuji, Arakawa Mototaka, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　26　327-328　2005/11/16
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
P3-67 Investigation of the thickness of thin liquid layer in the longitudinal acoustic property measurements by the plane-wave ultrasonic material characterization system

Odagawa Hiroyuki, Arakawa Mototaka, Kushibiki Jun-ichi

Proceedings of Symposium on Ultrasonic Electronics　26　473-474　2005/11/16
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
P3-39 Accurate calibration line for super-precise CTE evaluation technology of TiO_2-SiO_2 ultra-low-expansion glasses by the LFB ultrasonic material characterization system

Arakawa Mototaka, Kushibiki Jun-ichi, Ohashi Yuji, Suzuki Kouji

Proceedings of Symposium on Ultrasonic Electronics　26　417-418　2005/11/16
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
Investigation of longitudinal acoustic properties measurements using solid reference specimens with relatively thick specimen layer in UHF range

ODAGAWA Hiroyuki, ARAKARA Mototaka, KUSHIBIKI Junichi

IEICE technical report. Ultrasonics　105　(312)　25-28　2005/09/29
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We developed a method of measuring UHF-range longitudinal acoustic properties of both solid specimens and liquid specimens by a plane-wave ultrasonic material characterization system, in which the liquid coupler or liquid employed with a thickness of less than 1μm. In order to obtain an accurate thickness of the liquid layer, we measured a dip-frequency, where a reflection coefficient at the thin liquid layer became minimum value. In previous experiments, we used the thickness of λ_d/2 (λ_d : wavelength of ultrasonic wave in the thin liquid layer at a frequency of f_d which is in a measurement frequency band). In this condition, only one dip existed in the measurement frequency band. However, when we want to measure a viscous specimen or biological tissue, and when we want to measure in high frequency, it would be difficult to make the layer thin. In this paper, we investigated a measurement using a relatively thick liquid layers. In this case, several dip-frequencies will exist in the measurement frequency band. Our calculation results show that we can apply this measurement to the thicker liquid layer successfully. This method has a prospect that it can apply to various materials and high frequency range.
LFB超音波材料解析システムによる超低膨張ガラスの評価のための標準試料とその音響特性

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

日本音響学会研究発表会講演論文集　2005　2005

ISSN： 1340-3168
LFB超音波材料解析システムによる高波形減衰率材料に対する漏洩弾性表面波速度測定の精度向上-超音波周波数の選択-

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

日本音響学会研究発表会講演論文集　2005　2005

ISSN： 1340-3168
LFB超音波材料解析システムを用いたEUVLグレード超低膨張ガラスの高精度CTE評価法(II)-TiO₂-SiO₂ガラス

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

応用物理学関係連合講演会講演予稿集　52nd　(2)　2005
Evaluation Method for Striae of TiO₂-SiO₂ Glasses Using the LFB Ultrasonic Material Characterization System-Experimental Study of Internal Structure-

大橋雄二, 荒川元孝, 櫛引淳一

電子情報通信学会技術研究報告　105　(313(US2005 44-52))　2005

ISSN： 0913-5685
LFB超音波材料解析システムを用いたEUVLグレード超低膨張ガラスの高精度CTE評価法(I)-システムとその性能

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

応用物理学関係連合講演会講演予稿集　52nd　(2)　2005
Accurate calibration line for super-precise CTE evaluation technology of TiO₂-SiO₂ ultra-low-expansion glasses using the LFB ultrasonic material characterization system

荒川元孝, 櫛引淳一, 大橋雄二, 鈴木光二

電子情報通信学会技術研究報告　105　(313(US2005 44-52))　2005

ISSN： 0913-5685
Proper Strandard Specimens and Their Acoustic Properties for Calibrating the LFB Ultrasonic Material Characterization System to Evaluate Ultra-Low Expansion Glasses with Periodic Striae

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

電子情報通信学会技術研究報告　105　(5(US2005 1-5))　2005

ISSN： 0913-5685
LFB超音波材料解析システムによる高波形減衰率材料に対する漏洩弾性表面波速度測定の精度向上

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

圧電材料・デバイスシンポジウム　2005　2005
Evaluation Method for Striae of TiO₂-SiO₂ Glasses Using the LFB Ultrasonic Material Characterization System-Accurate Measurement of Leaky Surface Acoustic Wave Velocity-

荒川元孝, 大橋雄二, 櫛引淳一

電子情報通信学会技術研究報告　105　(440(US2005 82-92))　2005

ISSN： 0913-5685
LFB超音波材料解析システムを用いたEUVLグレード超低膨張ガラスの高精度CTE評価法(III)-結晶化ガラス

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

応用物理学関係連合講演会講演予稿集　52nd　(2)　2005
Improvement of velocity measurement accuracy of leaky surface acoustic wave for materials with highly attenuated waveform by the LFB ultrasonic material characterization system

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

電子情報通信学会技術研究報告　104　(704(US2004 102-108))　2005

ISSN： 0913-5685
LFB超音波材料解析システムの校正用TiO₂-SiO₂ガラス標準試料に対する漏洩弾性表面波速度の高精度測定

大橋雄二, 荒川元孝, 櫛引淳一

日本音響学会研究発表会講演論文集(CD-ROM)　2005　2005

ISSN： 1880-7658
脈理のある超低膨張ガラス評価のためのLFB超音波材料解析システム用標準試料とその音響特性

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

EMシンポジウム　34th　2005
LFB超音波材料解析システムによるTiO₂-SiO₂超低膨張ガラスの線膨張係数評価のための正確な検量線

荒川元孝, 櫛引淳一, 大橋雄二, 鈴木光二

日本音響学会研究発表会講演論文集(CD-ROM)　2005　2005

ISSN： 1880-7658
Longitudinal Acoustic Properties Measurements of Solid Specimens by the Plane-Wave Ultrasonic Material Characterization System in the UHF Range

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka

IEICE technical report. Ultrasonics　104　(468)　37-42　2004/11/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A method for measuring longitudinal acoustic properties of solid specimens by the plane-wave ultrasonic material characterization system in the UHF range is investigated theoretically and experimentally. Measurements for solid specimens are performed in the ultrasonic composite transmission line, consisting of a buffer rod with an ultrasonic transducer on one end, a bonding layer of salol, and a specimen. Proper materials for the buffer rod have been investigated by numerical calculations, because the propagation loss in the buffer rod cannot be neglected in the UHF ranse. Measurements have been demonstrated in a frequency range from 50 to 1180 MHz for a synthetic silica glass (C-7980, Corning Inc.) with no velocity dispersion in the VHF range and a Pyrex class (C-7740, Coming Inc.) with velocity dispersion.
F-2 A Super-Precision Evaluation Method of CTE for Ultra-Low Expansion Glasses Using the LFB Ultrasonic Material Characterization System(Measurement techniques, Imaging, Nondestructive testing)

Kushibiki Jun-ichi, Arakawa Mototaka, Ohashi Yuji, Suzuki Kouji, Maruyama Takahisa

Proceedings of Symposium on Ultrasonic Electronics　25　305-306　2004/10/27
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236

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We applied the LFB-UMC system to the evaluation of commercial TiO_2-SiO_2 glasses, and demonstrated that this system is extremely useful for characterization of ULE glasses in the EUVL system. We will hereafter improve the measurement accuracy and study the measurement model to establish the striae evaluation method for the TiO_2-SiO_2 glasses.
P2-1 Elastic and Piezoelectric Properties of Langasite Family Ca_3NbGa_3Si_2O_<14> Single Crystals(Short presentation for poster)

Adachi Masatoshi, Karaki Tomoaki, Kushibiki Jun-ichi, Arakawa Mototaka

Proceedings of Symposium on Ultrasonic Electronics　25　159-160　2004/10/27
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
A super accurate evaluation method of CTE for ultra-low expansion glasses using the LFB ultrasonic material characterization system

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OHASHI Yuji, MARUYAMA Takahisa, SUZUKI Kouji

IEICE technical report. Ultrasonics　104　(298)　49-54　2004/09/09
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A super accurate evaluation method of the coefficient of thermal expansion (CTE) of ultra-low expansion glasses was developed using the LFB ultrasonic material characterization system. Two kinds of commercial glasses, TiO_2-SiO_2 glass (C-7971, Corning Inc.) and Li_2O-Al_2O_3-SiO_2 glass ceramics (Zerodur, Schott AG) were taken. For the C-7971 specimens, sensitivity and resolution in the velocity measurement of leaky surface acoustic waves (LSAWs) to CTE were estimated to be 4.40 (ppb/K)/(m/s) and ±0.77 ppb/K for ±2σ (σ: standard deviation). LSAW velocity differences caused by different TiO_2 concentrations and distributions or striae in each specimen were successfully detected. For the Zerodur specimens, LSAW velocity differences associated with the chemical compositions and crystallization conditions were observed among different ingots/specimens. This ultrasonic method is extremely useful and effective for evaluating ultra-low expansion glasses needed for the extreme ultra-violet lithography (EUVL) system.
Measurements of the acoustical physical constants of Sr_3TaGa_3Si_2O_<14> and Sr_3NbGa_3Si_2O_<14> single crystals

KUSHIBIKI J., ARAKAWA M., OHTAGAWA M.

2004　(1)　997-998　2004/03/17

ISSN： 1340-3168
Acoustic property measurements of solid specimens by the plane-wave ultrasonic material characterization system in the UHF range

KUSHIBIKI J., ARAKAWA M.

2004　(1)　1001-1002　2004/03/17

ISSN： 1340-3168
Development of a Linear and Nonlinear Bioultrasonic Spectroscopy System in the VHF/UHF Range

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, AKASHI Naoyuki, DUNN Floyd

IEICE technical report. Ultrasonics　103　(669)　39-44　2004/02/18
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We have developed methods and prototype systems to measure linear and nonlinear acoustic properties of liquid specimens in the VHP and UHF ranges. This paper describes an advanced system to measure accurately both linear and nonlinear acoustic properties, viz., velocity, attenuation, acoustic impedance, density, and nonlinearity parameter β, of liquid specimens in a frequency range from 10 to 1100 MHz. The acoustic properties are measured in an ultrasonic transmission line consisting of the specimen sandwiched between two SiO_2 glass buffer rods. The acoustic properties of pure water were measured at 23℃. Velocity was constant at 1491.23±0.02 m/s in a frequency range of 50-180 MHz. The relative measurement accuracy of β was obtained within ±0.010% at the fundamental frequency of 150 MHz.
直線集束ビーム超音波材料解析システムによる超低膨張ガラスの評価

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二, 丸山貴久

日本音響学会研究発表会講演論文集　2004　2004

ISSN： 1340-3168
D-5 Evaluation of Glass Materials by the Line-Focus-Beam Ultrasonic Material Characterization System

Kushibiki Jun-ichi, Arakawa Mototaka, Ohashi Yuji, Okabe Ryoichi

Proceedings of Symposium on Ultrasonic Electronics　24　351-352　2003/11/12
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
D-9 Longitudinal Acoustic Property Measurements of Solid Specimens by the Plane-Wave Ultrasonic Material Characterization System in the VHF/UHF Range

Kushibiki Jun-ichi, Arakawa Mototaka, Okabe Ryoichi

Proceedings of Symposium on Ultrasonic Electronics　24　359-360　2003/11/12
Publisher: Steering committee of symposium on ultrasonic electronics
ISSN： 1348-8236
Longitudinal Acoustic Property Measurements of Solid Specimens by the Plane-Wave Ultrasonic Material Characterization System in the VHF/UHF Range

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OKABE Ryoichi

IEICE technical report. Ultrasonics　103　(339)　7-12　2003/09/29
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Expansion of the frequency range on the measurements of longitudinal acoustic properties, viz., velocity and attenuation coefficient, of solid specimens by the plane-wave ultrasonic material characterization system is investigated. The measurements are conducted in a composite acoustic transmission line consisting of a synthetic silica glass buffer rod with an ultrasonic transducer on one end, a couplant, and a specimen. Usually, pure water is used for the couplant in the lower frequency range up to around 300 MHz. For the measurements in the higher frequency range, specimens are bonded to the buffer rod using salol. Measurements are demonstrated in a frequency range of 15-640 MHz using two kinds of a synthetic silica glass with no velocity dispersion and a pyrex glass with a significant velocity dispersion.
Evaluation of Glass Materials by the Line-Focus-Beam Ultrasonic Material Characterization System

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OHASHI Yuji, OKABE Ryoichi

IEICE technical report. Ultrasonics　103　(339)　1-6　2003/09/29
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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The line-focus-beam ultrasonic material characterization (LFB-UMC) system is applied to evaluation of commercial Pyrex glasses (C-7740, Coming Inc.). Twenty-eight specimens were prepared at random from different lots. Leaky surface acoustic wave and leaky surface-skimming compressional wave velocities were obtained through the. measurements of V(z) curves at 225 MHz around 23℃. The differences in the acoustic properties must be related to the different chemical compositions or the different thermal histories in the fabrication processes. In order to investigate the differences of leaky acoustic wave velocities, bulk acoustic properties, viz., longitudinal and shear velocities, and density, were measured around 23℃ for eight specimens extracted from the twenty-eight specimens. All the bulk acoustic properties were changed as well as leaky acoustic wave velocities. Thus, we demonstrated that the LFB-UMC system is very useful and effective for evaluation of glasses and control of the production processes.
B-5 Evaluation of effective radius as circular piston source of bulk-wave ultrasonic transducer for accurate velocity measurements

Arakawa M., Aoki N., Kushibiki J.

Symposium on ultrasonic electronics　(23)　117-118　2002/11/07
Publisher: Steering committee of symposium on ultrasonic electronics
Evaluation of effective radius as circular piston source of bulk-wave ultrasonic transducer for accurate velocity measurements

ARAKAWA Mototaka, AOKI Naoya, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　102　(308)　37-42　2002/09/13
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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An effective radius as a circular piston source of bulk-wave ultrasonic transducer attached on one end of the synthetic silica (SiO_2) glass buffer rod is evaluated for accurate velocity measurements for dispersive specimens over a wider frequency range. It was determined by comparing measured and calculated phase variations due to diffraction for an SiO_2 glass standard specimen. Fourteen devices were evaluated. For example, velocities of the standard specimen (C-7940) are 5934.10±0.35 m/s at 70-290 MHz after diffraction correction using the nominal radius (0.75 mm), for an ultrasonic device of which the center frequency is around 400 MHz. On the other hand, the corrected velocities are accurately obtained to be 5934.10±0.03 m/s by using the effective radius (0.780 mm) for the correction.
Measurements of acoustic properties of thin lossy specimens using the reference solid specimen in the VHF/UHF range

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

2002　(1)　965-966　2002/03/18

ISSN： 1340-3168
Precise measurement of velocity dispersion using the ultrasonic double-pulse interfere method

OKABE Ryoichi, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

2002　(1)　963-964　2002/03/18

ISSN： 1340-3168
B-2 Accurate measurements of velocity dispersion and attenuation in the VHF range and its application to silicate glasses

Okabe Ryoichi, Arakawa Mototaka, Kushibiki Jun-ichi

Symposium on ultrasonic electronics　(22)　13-14　2001/11/07
Publisher: Steering committee of symposium on ultrasonic electronics
Correction for the effects of bonding layer on precise velocity measurements using bulk ultrasonic pulsed waves

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　101　(317)　15-22　2001/09/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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In this paper, a correction method of the phase variations is discussed in order to accurately measure the ultrasonic velocity, when the specimen is bonded to the ultrasonic device. The procedures are investigated theoretically and experimentally in the VHF range by taking salol as a bonding material. A synthetic silica glass is used for the specimen, because true acoustic properties, longitudinal velocity and attenuation, can be measured by using pure water as a coupling materials. To discuss the accuracy of the correction, the longitudinal velocities were measured for the specimen bonded with salol. Accounting for velocity dispersion and frequency dependence of attenuation in the bonding layer for correction, the results agreed with the true velocity within an accuracy of ±0.08 m/s. Also, the shear velocities were measured seven times for the specimen, and the maximum deviation of 0.13 m/s were obtained.
Ultrasonic spectroscopy of silicate glasses in the VHF range

OKABE Ryoichi, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　101　(317)　59-66　2001/09/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A measuring method of precisely velocity dispersion and attenuation for acoustically lossy solid materials in the VHF range was exploited by using complex-mode measurements together with the diffraction correction method. The experimental procedure of the method was described and it was demonstrated to measure a dispersive borosilicate glass(C-7740)and a non-dispersive synthetic silica glass(C-7980)in the frequency range from 50 to 230 MHz. As a result, the velocity of C-7980 was determined to be an almost constant value of 5929.14±0.03m/s, while the velocity of C-7740 was changed around 2 m/s in the frequency range used here. The attenuation coefficient, α=α_0・&fnof;^β, was determined to be α_0=1.07×10^<-16>s^2/m, β=2 for C-7980 and α_0=5.16×10^<-9>s^2/m, β=1.25 for C-7740.
High accuracy standard specimens for the line-focus-beam ultrasonic material characterization system

OKABE Ryoichi, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

2001　(1)　947-948　2001/03/01

ISSN： 1340-3168
PB05 Measurements of longitudinal and shear acoustic properties of salol in the VHF range

Arakawa Mototaka, Kushibiki Jun-ichi

Symposium on ultrasonic electronics　(21)　95-96　2000/11/06
Publisher: Steering committee of symposium on ultrasonic electronics
PB04 Acoustic properties of standard specimens for the LFB ultrasonic material characterization system : synthetic silica glasses

Okabe Ryoichi, Arakawa Mototaka, Kushibiki Jun-ichi

Symposium on ultrasonic electronics　(21)　93-94　2000/11/06
Publisher: Steering committee of symposium on ultrasonic electronics
Measurements of longitudinal and shear acoustic properties of salol in the VHF range

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　100　(290)　15-21　2000/09/11
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Correction of the phase variations caused by the bonding layer between a specimen and a transducer or a buffer rod is needed for precise bulk-wave velocity measurements, with basic data of the acoustic properties of the bonding layer. We have developed an ultrasonic spectroscopy system, in order to accurately measure the acoustic properties of solid, liquid, and biological tissue specimens in the VHF and UHF ranges. Salol is used as a bonding material for shear velocity measurements in this system. However, the acoustic properties of salol have not been obtained in the VHF range. This paper reports an experimental procedure for measuring the longitudinal velocity, shear velocity, and density, and the fundamental data obtained in the VHF range.
Acoustic properties of standard specimens for the line-focus-beam ultrasonic material characterization system : synthetic silica glasses

OKABE Ryoichi, ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

IEICE technical report. Ultrasonics　100　(290)　7-14　2000/09/11
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Bulk acoustic properties of four kinds of synthetic silica glass specimens as standard specimens to calibrate the line-focus-beam ultrasonic material characterization(LEB-UMC)system are measured with high accuracy around 23℃. All the specimens with highly elastic homogeneity are made by the direct method through the hydrolysis of ultra-high-purity SiCl_4 in an oxygen-hydrogen flame. Accurate values of the acoustic properties of longitudinal and shear velocities, and densities are obtained, although the effective figures are dominated mainly by the measurement accuracy of the specimen thickness. Some significant differences in the acoustic properties and the thermal coefficients of both longitudinal and shear velocities among the specimens are detected. The difference might be due to different amounts of impurities such as hydroxyl and chlorine ions incorporated and some differences in thermal history during the producation process. And, it is shown that the LFB-UMC system is calibrated with higher accuracy for the leaky surface acoustic wave propagation characteristics of the synthetic silica glass specimens.
Accurate measurements of bulk-wave ultrasonic velocities by the pulse interference method

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

2000　(1)　845-846　2000/03/01

ISSN： 1340-3168
Measurements of acoustic properties of water by complex mode

MORITA H., ARAKAWA M., KUSHIBIKI J.

2000　(1)　843-844　2000/03/01

ISSN： 1340-3168
PF-12 Diffraction effects on bulk-wave ultrasonic velocity measurements

Kushibiki Jun-ichi, Arakawa Mototaka

Symposium on ultrasonic electronics　(20)　261-262　1999/11/17
Publisher: Steering committee of symposium on ultrasonic electronics
Accurate Measurements of the Acoustical Physical Constants of LiNbO_3 and LiTaO_3 Single Crystals

KUSHIBIKI J., TAKANAGA I., ARAKAWA M., SANNOMIYA T.

1999　(1)　833-834　1999/03/01

ISSN： 1340-3168
Influence of the waves reflected from the bottom surface of solid specimen on velocity measurements by line-focus-beam acoustic microscopy.

櫛引淳一, 大橋雄二, 荒川元孝

電子情報通信学会技術研究報告　98　(108(US98 16-23))　1998

ISSN： 0913-5685
Measurements of acoustic properties of glasses in the VHF range.

WEI Ting cun, ARAKAWA Mototaka, AKASHI Naoyuki, KUSHIBIKI Jun-ichi

1997　(2)　1037-1038　1997/03/01

ISSN： 1340-3168
Influence of the waves reflected from the bottom surface of sample on velocity measurements by the line-focus-beam acoustic microscopy system. Effect of sample thickness.

櫛引淳一, 荒川元孝, 大橋雄二

日本音響学会研究発表会講演論文集　1997　(Spring Pt 2)　1997

ISSN： 1340-3168
A Calibration Method of the Line-Focus-Beam Acoustic Microscope System Using Standard Specimens

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

1996　(89)　11-21　1996/11/27
Determination of elastic constants of nonpiezoelectric cubic single crystals by the bulk ultrasonic wave pulse interference method -Temperature dependence of elastic constants around room temperature-

ARAKAWA Motokata, KUSHIBIKI Jun-ichi

1996　(2)　895-896　1996/03/01

ISSN： 1340-3168
PF3 Acoustic properties of standard specimen for calibration of the LFB acoustic microscopy system

Arakawa M., Kushibiki J.

Symposium on ultrasonic electronics　(16)　177-178　1995/11/27
Publisher: Steering committee of symposium on ultrasonic electronics
Determination of elastic constants of nonpiezoelectric single crystals by the bulk ultrasonic wave pulse interference method - A method to determine elastic constants of trigonal 3m-

ARAKAWA M., TAKANAGA I., KUSHIBIKI J., CHUBACHI N.

1995　(1)　979-980　1995/03/01

ISSN： 1340-3168
E-6 Determination of elastic constants of nonpiezoelectric cubic single crystals by the bulk ultrasonic wave pulse interference method

Arakawa M., Kushibiki J., Chubachi N.

Symposium on ultrasonic electronics　(15)　149-150　1994/11/28
Publisher: Steering committee of symposium on ultrasonic electronics
A-213 Acoustic properties of standard specimen for calibration of the LFB acoustic microscopy system

Arakawa Mototaka, Kushibiki Jun-ichi, Chubachi Noriyoshi

1994　214-214　1994/09/05
Publisher: The Institute of Electronics, Information and Communication Engineers
Determination of elastic constants of nonpiezoelectric cubic single crystals by the bulk ultrasonic wave pulse interference method

Arakawa Mototaka, Kushibiki Jun-ichi, Chubachi Noriyoshi

IEICE technical report. Ultrasonics　94　51-58　1994
Publisher: The Institute of Electronics, Information and Communication Engineers

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In order to calibrate a fine-focus-beam acoustic microscopy system,it is necessary to introduce a standard specimen whose bulk acoustic properties,viz.,the independent elastic constants and density,are measured with high accuracy.For this purpose,we have developed a method of determining elastic constants of isotropic specimens by the bulk ultrasonic wave pulse interference method. Single crystals are more desirable for a standard specimen at higher frequencies because of their high homogeneity and low attenuation.In this paper,this method is extended to anisotropic specimens.A way to determine elastic constants more precisely for nonpiezoelectric cubic single crystals is discussed in measuring longitudinal and shear wave velocities for(100),(110),and(111) specimens.Elastic constants of Gadolinium Gallium Garnet,Si,and Ge were determined,and compared with the published data.

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Books and Other Publications 1

Acoustic keyword book

日本音響学会編

コロナ社　2016/03/22

ISBN: 9784339008807

Industrial Property Rights 11

強化ガラスの表面特性の測定方法

櫛引淳一, 荒川元孝, 大橋雄二, 川口邦子, 竹田宣生

特許6372795

Property Type: Patent
圧電単結晶／セラミック材料の音響関連物理定数決定方法、その方法を使った音響関連物理定数の温度係数決定方法及びその温度係数決定方法を使った最適結晶方位及び伝搬方向決定方法

大橋雄二, 荒川元孝, 櫛引淳一, 安達正利

特許6278455

Property Type: Patent

Holder:
超音波断層画像の作成方法

荒川元孝, 金井浩, 森翔平, 山内正憲, 大西詠子

Property Type: Patent
光学ガラスの仮想温度の測定方法

櫛引淳一, 荒川元孝

特許5626927

Property Type: Patent
超低膨張ガラスの製造方法

櫛引淳一, 荒川元孝

Property Type: Patent
シリカ・チタニアガラス及びその製造方法、線膨張係数測定方法

櫛引淳一, 荒川元孝, 上田哲司, 藤ノ木朗

特許5314901

Property Type: Patent
脈理を有する材料の漏洩弾性表面波速度と化学組成比および線膨張係数との関係を求める方法、およびその関係を使ったTiO2-SiO2ガラスのTiO2濃度測定方法および線膨張係数測定方法

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二

特許4825972

Property Type: Patent
超音波速度・減衰係数計測方法

櫛引淳一, 小田川裕之, 荒川元孝

特許4621913

Property Type: Patent
脈理を有する材料に対する超音波材料特性解析装置校正用標準試料の作製方法

櫛引淳一, 荒川元孝, 大橋雄二, 鈴木光二

特許4560625

Property Type: Patent
超低膨張ガラス材料の線膨張係数評価方法

櫛引淳一, 荒川元孝, 大橋雄二, 篠崎行啓

特許4036268

Property Type: Patent
厚さ測定装置及び測定方法

櫛引淳一, 荒川元孝, 岡部亮一

EP1239259B1

Property Type: Patent

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Research Projects 21

Study on the Accurate Ultrasonic Metrology Competitive

2000/04 - Present
Study on the correlation between red blood cell aggregation and diabetic vascular complications by measuring ultrasonic backscatter characteristics

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2024/04/01 - 2027/03/31
Research on optimization of low-intensity ultrasonic irradiation conditions for ultrasonic therapy to activate self-healing power

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2026/03/31
A study on measurement method of viscoelastic property of blood vessel wall aiming at early diagnosis of arteriosclerosis

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2021/04/01 - 2024/03/31
Ultrasonic visualization of thoracic vertebrae for supporting epidural anesthesia

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2020/04 - 2023/03
Early diagnosis of atherosclerosis by accurate ultrasonic measurement of surface roughness of internal elastic membrane

Kanai Hiroshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Tohoku University

2019/10 - 2022/03

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We have developed a method to exclude unnatural shapes at both ends of the surface shape measured for each beam by limiting the analysis range to the monotonically increasing part of the lateral displacement when measuring the surface shape for each beam. Furthermore, by interpolating the surface shape measured for each beam for each 1-micron lateral position, the error power is calculated with equal weight at all lateral positions of the surface shape measured for each beam, and the height is adjusted appropriately. We also developed a method. As a result, it became possible to obtain carotid artery surface roughness in vivo by reducing the beam-to-beam variation after adjusting the height of the surface shape measured for every single beam. These results were obtained by referring to Professor Wilhjelm's many years of research.
Ultrasonic visualization of propagation of electrical excitation causing contraction by measuring human myocardial response

Kanai Hiroshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2019/06 - 2022/03

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In the early stage of ischemic heart disease, the ischemic region can avoid myocardial necrosis by rapidly reperfusing the coronary arteries. Therefore, rapid identification of the ischemic region is important, and local and highly accurate velocity estimation is the key to the evaluation of local myocardial contraction characteristics using ultrasound. In this study, we analyzed the received ultrasonic signal at multiple frequencies and proposed a speed estimation method using ultrasonic phase differences at multiple different frequencies. This proposed method can reduce the effects of attenuation and interference as described above without performing spatial averaging, and local velocity estimation is possible. The proposed method can estimate the velocity with a shorter window width than the conventional method, and can measure the local velocity distribution and the local myocardial strain rate.
Basic study on high-accuracy acoustic property measurements of biological specimens by ultrasonic microscopy

ARAKAWA Mototaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2018/04 - 2021/03

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In this study, we proposed a robust analysis method for the acoustic properties of biological specimens measured by acoustic microscopy. To obtain the velocity and thickness of the specimen, parabolic approximation was performed to determine the frequency at which the amplitude of the normalized spectrum became maximum or minimum, considering the sound speed and thickness of the specimens and the operating frequency of the ultrasonic device used. The proposed method was demonstrated for a specimen of malignant melanoma of the skin by using acoustic microscopy attaching a concave transducer with a center frequency of 80 MHz. The variations in sound speed and thickness analyzed by the proposed method were markedly smaller than those analyzed by the method based on an autoregressive model. The proposed method is useful for the analysis of the acoustic properties of biological tissues or cells.
Development of photoacoustic flow cytometry by employing multi-channel high frequency ultrasonic probe

Nagaoka Ryo, SAIJO Yoshifumi, UMEMURA Shin-ichiro, YOSHIZAWA Shin, ARAKAWA Mototaka, ISHIKAWA Kazuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up

Category: Grant-in-Aid for Research Activity Start-up

2016/08 - 2018/03

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In a traditional photoacoustic flow cytometry, cells in vessels are aligned in one line by laser manipulation, and the photoacoustic signals induced from the cells are measured to classify the characteristics. However, scattering and absorption in the living tissues has effects on the propagation of the radiated laser, and the alignment of the cell by the manipulation cannot be achieved owing to the effect. In this study, the effect of the scattering and absorption was minimized by acoustical focusing, and the method could visualize the living tissues at the deeper part was developed.
UMS技術による強化ガラス評価法の研究

荒川元孝, 大橋雄二

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(C)

Category: 基盤研究(C)

Institution: 東北大学

2014/04 - 2017/03

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薄型、高信頼な強化ガラスが要求される中、高精度かつ信頼性の高い評価技術が要求されている。本研究代表者らは、物質・材料の音響特性を非破壊・非接触的に定量計測する「超音波マイクロスペクトロスコピー(UMS)」技術の基礎研究および材料評価への応用に関する研究を進めている。本研究では、強化ガラスの評価パラメータである表面応力や応力層深さとUMS技術より測定される音響特性との間の関係を求める。これによって、強化ガラスの新しい評価技術としてUMS技術を用いた方法を確立することを目的とする。さらに、表面応力により、圧縮応力層の弾性率がどのように変わるのかを明らかにし、計測モデルを構築する。本年度の成果は以下のとおりである。昨年度、平面超音波材料解析システムにより、化学強化ガラスの強化試料と未強化試料に対して、音速、減衰係数、密度を測定し、圧縮応力層の音響特性を推定した。その結果とK+イオン濃度分布から、圧縮応力層の弾性定数と密度の深さ方向分布を推定した。さらに、直線集束ビーム超音波材料解析システムにより漏洩弾性表面波速度の周波数依存性の測定を行った。数値計算値との比較から、構造緩和による表面応力の低下を速度変化として捉えたことを明らかにした。
Development of an optical cavity with residual strain free for optical frequency standards

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OHASHI Yuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04 - 2015/03

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Ultra-highly-stabilized and ultra-high-finesse optical cavities have been developed to realize ultra-narrow-linewidth lasers for optical frequency standards. TiO2-SiO2 glass is mainly used for the material of cavities. The fabrication process of cavity spacers includes machining processes such as drilling, grinding and lapping. Relaxation of the residual strain introduced by the machining gives rise to long-term length changes of cavities, resulting in long-term frequency changes, viz., creep. It is an important development issue to be resolved for obtaining an ultrastable optical cavity. In this study, we investigated the fabrication process conditions and the heat-treatment conditions to minimize the residual strain, and developed a proper procedure of fabricating a cavity spacer.
Ultrasonic Microspectroscopy of Wide Bandgap Semiconductor Materials

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OHASHI Yuji, HASHIMOTO Kenya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2011/04 - 2014/03

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To realize highly efficient and long life devices using wide bandgap semiconductors, such as AlN, ZnO, SiC, and GaN, it is necessary to employ homogeneous bulk single crystal substrates as well as proper fabrication processes for making homogeneous and high-quality films. To do so, we developed a new method for evaluating semiconductor materials using ultrasonic micro-spectroscopy (UMS) technology as an accurate evaluation technology. Although characterization of epitaxial film is generally difficult because of their elastic anisotropy, we demonstrated usefulness of the evaluation method through measuring velocities of leaky surface acoustic waves by the UMS technology and measuring density based on the Archimedes' principle for Sc doped AlN film specimens.
Development of evaluation method of glass materials by the UMS technology

ARAKAWA Mototaka, KUSHIBIKI Jun-ichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2011 - 2013

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Physical properties, e.g., refractive index and thermal expansion, of glass materials can be controlled with addition of dopants. Evaluation techniques for fabricated glasses are important to obtain glasses having the desired properties. In this study, acoustic properties (leaky surface acoustic wave velocity, longitudinal velocity, and density) were measured by the ultrasonic microspectroscopy technology. Relationships among acoustic properties, fictive temperature, OH concentration, and Cl concentration were obtained. We also obtained relationships among acoustic properties, F concentration, and fictive temperature for F-doped synthetic silica glasses.
Evaluation of glass thin films by the ultrasonic microspectroscopy technology

KUSHIBIKI Jun-ichi, ARAKAWA Mototaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2011 - 2012

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The ultrasonic microspectroscopy technology was applied to evaluation of glass thin films. Two SiO2/Ta2O5 multilayer films were deposited on SiO2 glass substrates by rf ion beam sputtering, and one of them was annealed. Frequency characteristics of leaky surface acoustic wave (LSAW) velocity were measured for specimens by the line-focus-beam ultrasonic material characterization system, and LSAW velocity changes due to the annealing were detected. TiO2-SiO2 thin films were also deposited on SiO2 glass substrates or TiO2-SiO2 glass substrates, and LSAW velocity changes due to the fictivetemperature changes of films were detected.
Precise Evaluation of Zero-CTE Temperature of Ultra-Low-Expansion Glass Using the Line-Focus-Beam Ultrasonic Material Characterization System

ARAKAWA Mototaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2008 - 2009

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Zero-CTE temperatures, temperatures at which coefficients of thermal expansion (CTE) become zero, T(zero-CTE), of TiO_2-SiO_2 ultra-low-expansion glasses depend not only on the TiO_2 concentrations C (TiO_2) but also on the fictive temperatures T_f and the OH concentrations C (OH). Calibration lines, viz., interrelationships among T (zero-CTE), C (TiO_2), T_f, C (OH), and acoustic properties (leaky surface acoustic wave velocity, longitudinal velocity, shear velocity, and density), were obtained to evaluate T (zero-CTE) of TiO_2-SiO_2 ultra-low-expansion glasses by the line-focus-beam ultrasonic material characterization system.
Development of Evaluation Method of High Quality Diamond Film for 10 GHz-Range Surface Acoustic Wave Device

ODAGAWA Hiroyuki, KUSHIBIKI Jun-ichi, ARAKAWA Mototaka, OHASHI Yuji, SHIKATA Shinichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2006 - 2008
微小結晶評価用マイクロLFB超音波プローブの開発

櫛引淳一, 小田川裕之, 荒川元孝, 大橋雄二

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2006 - 2007

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通常のLFB超音波プローブのトランスデューサ装着面を超音波ビームの非集束方向に緩やかに湾曲させることで、超音波ビーム照射領域を小さくした200MHz帯マイクロLFB超音波プローブを作製した。点集束ビーム超音波プローブを受波プローブとして非集束方向の音場分布を計測したところ、0.26mmの幅となり通常のLFB超音波プローブに比べて1/3以下となった。Y-cutおよびZ-cutのLiTaO_3や(110)面および(111)面のGeを用いて異方性検出能力を実験的に検討した結果、超音波ビームの集束方向にのみ漏洩弾性表面波(LSAW)が励振され、通常のLFB超音波プローブと同様に試料の異方性(LSAW速度の伝搬方向依存性)の検出ができた。また、LSAW速度の測定再現性も、通常のLFB超音波プローブと同程度で得られた。このため、基本的には従来の標準試料を用いたシステムの校正方法を適用できる。超音波ビームの非集束方向の測定領域幅が狭くなったことにより、試料面の傾きに対する感度が鈍感になったため、超音波ビームの焦点位置計測を利用した試料のアライメント方法を検討した。最後に、測定領域の空間分解能について、Z-cut ZnO単結晶試料に対するLSAW速度の2次元分布計測を通して検討した。通常のLFB超音波プローブでは測定領域内の特性の分布が平均化されて検出できなかった速度分布をマイクロLFB超音波プローブでは検出することに成功した。これにより、開発初期の微小結晶の評価だけでなく、結晶内の微小領域で特性が変化している試料に対する評価が可能なマイクロLFB超音波プローブの開発に成功した。
超音波スペクトロスコピーシステムによる異方性固体の音速、減衰の精密計測

荒川元孝

Offer Organization: 日本学術振興会

System: 科学研究費助成事業若手研究(B)

Category: 若手研究(B)

Institution: 東北大学

2003 - 2005

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本研究は異方性固体の音速、減衰を高精度に計測することを目的とし、異方性固体の音速・減衰測定における回折の影響、および厚さ測定における歪みの影響を理論的・実験的に検討する。有効数字6桁の音速を得ることを目標とする。平成17年度の研究成果を要約すると以下の通りである。 1.昨年度までに作成した異方性固体中を伝搬する際の回折の影響を計算するための近軸理論に基づくプログラムは、超音波スペクトロスコピーシステムによる音速・減衰測定時の実験構成である超音波トランスデューサ、合成石英ガラスバッファーロッド、水カプラ、試料からなる複合音響伝送線路における回折の影響について数値計算が行える。人工水晶のX-cut, Y-cut, Z-cutを試料として、超音波スペクトロスコピーシステムにより縦波音速を測定し、本プログラムにより回折の影響を補正した場合の音速の精度について詳細に検討した。この結果、回折を補正することにより、±0.10m/s以内で音速の絶対値を測定できることがわかった。このため、本手法は高精度な音響関連物理定数(弾性定数、圧電定数、誘電率、密度)の決定に有用といえる。 2.音速測定の精度についてより詳細に検討するため、独立な弾性定数の数が比較的少ない(6個)サファイア単結晶の弾性定数を決定した。X-cut, Y-cut, Z-cut、および2枚の回転Y板を用意して、縦波音速、横波音速、および密度を測定することにより、室温付近の温度依存性を含めた高精度な弾性定数(±0.01%〜±0.18%)を決定した。 3.厚さ測定における測長子の接触に伴う歪みの影響を数値計算するために、球と平面との接触について有限要素法を用いて解析を行うためのプログラムについて検討を行った。
次世代材料のための超音波顕微鏡の超高精度化に関する基礎的研究

西野秀郎, 荒川元孝, 櫛引淳一

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(B)

Category: 基盤研究(B)

Institution: 東北大学

2002 - 2004

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超音波顕微鏡で用いている集束超音波デバイスの詳細な音場検討のために、前年度に作製した線形および非線形のシミュレーションプルグラムを用いて、超音波顕微鏡レベルの高周波域の計算を行った。超音波顕微鏡では、多メディアでの伝搬をシミュレートする必要があるが、数100MHz以上の計算では、従来の指数積分関数を用いた方法に限界があることを定量的に示すことが出来た。そこで、指数関数積分の被積分関数を2次の微小項まで考慮する計算方法を考案した。以上の補正方法は、数10MHz付近までの計算では不要であることを示した。同様に、線形域での音場計算から、周波数による音場の変化と、得られるV(z)曲線との相関関係を示すことが出来た。前年度の予定で示したように、本年度は、物理的境界のある材料での、超音波顕微鏡の超高精度計測を目指した波動伝搬問題の基礎研究を行った。本研究代表者は、ラム波から円管を伝搬する超音波の新しい定義を行い、論文とした実績を有しているが、それを土台として、円管を伝搬する超音波のモード別の検出方法などを、理論実験の両面から提唱した。これは、非破壊検査協会誌の論文として掲載予定である。本研究に付随して、ラム波から円管を伝搬する超音波に関する、解説記事の執筆も行った。超音波顕微鏡で用いる、集束超音波デバイス作製のために、前年度までのECRスパッター法に加え、RFスパッター法による作製の環境を整え、デバイス間格差の検討を行える環境の整備を行った。
Ultrasonic Microspectroscopy of Ultra-High-Quality Synthetic a-Quartz

KUSHIBIKI Jun-ichi, MIYASHITA Masahito, TAKANAGA Izumi, ARAKAWA Mototaka, NAGAI Kunihiko, NISHINO Hideo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2001 - 2002

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Ultrasonic microspectroscopy technology, using the line-focus-beam (LFB) and plane-wave (PW) ultrasonic material characterization (UMC) system, has been applied to establish evaluation techniques for synthetic α-quartz crystals for bulk acoustic wave (BAW) and surface acoustic wave (SAW) devices and to accurately measure the acoustical physical constants. The purpose of this study was to provide a new, worldwide guideline and standard for synthetic α-quartz in the industrial and scientific fields. 1. Measurement accuracies of the LFB ultrasonic material characterization system and bulk ultrasonic spectroscopy system have been improved. 2. Development of new methods for determining the acoustical physical constants of class-32 crystals and determination of the constants of synthetic and natural α-quartz: (1) A new BAW method to accurately determine all of the independent components of the acoustical physical constants for class-32 crystals was developed. This method requires to measure longitudinal and shear velocities, dielectric constants, and density, using X-, Y-, and Z-cut specimens and several rotated Y-cut specimens. The demonstration was conducted for SAW-grade synthetic α-quartz. The results provided the constants that give BAW velocities within an accuracy of ±0.2 m/s (±0.004%). (2) To compare the acoustic properties between natural and synthetic α-quartz, longitudinal and shear velocities, and LSAW velocities were measured using X-, Y-, and Z-cut specimens. All the velocity differences were within 1.00 m/s, and it was clarified that the acoustical physical constants of the natural quartz, were, very similar to those of synthetic quartz. (3) Another new method for determining all the constants for class-32 crystals by measuring LSAW velocities in addition to BAW velocities for there principal X-, K and Z-cut specimens using the LFB/PW UMC system was developed. This method was applied for natural α-quartz. (4) Precise values of the constants for natural quartz were also determined using the BAW method developed here. 3. BAW velocities. LSAW velocities, density and lattice parameters were measured for the specimens prepared from several synthetic α-quartz crystal ingots with different growth conditions. Slight velocity differences were detected. The velocity changes related to the impurity concentration, especially OH content, were different for the propagation directions and propagation modes. Lattice constant a was constant, but c became larger as the OH content became higher.
Development of a Method to Evaluate the Surface of Single Crystal Substrates for Super-High-Frequency SAW Devices by UMS Technology

KUSHIBIKI Jun-ichi, MATSUMOTO Yasushi, IZUMI Takanaga, ARAKAWA Mototaka, ODAGAWA Hiroyuki, CHO Yasuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2000 - 2002

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In this study, ultrasonic microspectroscopy (UMS) technology, using the line-focus-beam (LFB) and plane-wave ultrasonic material characterization system, has been applied to the problems associated with the homogeneities and modified/damaged surface layers of LiNbO_3 and LiTaO_3 single crystals for super-high-frequency (SHF) surface acoustic wave (SAW) devices. The purpose of this study was to establish the quantitative analysis and evaluation method using this technology. 1. The relative and absolute accuracies for the propagation characteristics of leaky SAW (LSAW) measured by the LFB-UMC system have been improved. 2. Chemical composition dependences of the acoustical physical constants of LiNbO_3 and LiTaO_3 single crystals were determined. This enables us to calculate the propagation characteristics of LSAW and SAW for the crystals with an arbitrary chemical composition. 3. Experimental relationships (calibration lines) among the LSAW velocity, Curie temperature, lattice constants, etc., were obtained to evaluate each property of the crystals by a common scale of LSAW velocity. 4. A method for improving the crystal growth conditions through the evaluation of the chemical composition distributions of commercially available LiTaO_3 single crystals was proposed and an extremely homogeneous crystal was successfully grown. 5. For the demonstration of evaluating modified/damaged surface layers, we fabricated several LiTaO_3 substrates with protonexchanged layers and domain-inverted layers as model specimens. The thickness resolution of the surface layers estimated by LSAW velocity was nanometer order. 6. The resolution of scanning nonlinear dielectric microscopy was improved with an atomic size. 7. Center frequencies and SAW velocities were measured for 0.5, 1, and 2 GHz-band SAW filters fabricated on LiTaO_3 wafers whose distributions in chemical composition were preexamined by measuring LSAW velocities. The results exhibited that variations of the center frequencies and differences between the calculated and measured SAW velocities became larger as the frequency became higher. It was considered that problems associated with the damaged surface layers of the substrates were detected.

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超音波マイクロスペクトロスコピー技術によるガラス材料評価法の開発

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本研究は、UMS技術によるガラス材料評価法の開発を目的とする。試料として、石英系ガラス、その基礎となる石英(SiO2)ガラス、および結晶化ガラスを取り上げ、UMS技術により音響特性を計測する。さらに、UMS技術による評価結果と従来法による評価結果を比較することにより、ガラス材料評価法としての有用性を示す。
EUVL用超低膨張ガラスのゼロCTE温度評価法の開発

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本研究では、UMS技術によりEUVL用TiO2-SiO2超低膨張ガラスにおいてCTEがゼロとなる温度（ゼロCTE温度）を求めるために、CTE、化学組成比（TiO2濃度、OH濃度）と熱履歴（仮想温度）、そしてUMS技術により計測される音響特性（音速）との間の正確な関係を求める。