Prof. Yoshikazu Ohara, Ph.D.

Department of Materials Processing, School of Engineering, Tohoku University
(Division for the Establishment of Frontier Sciences of the Organization for Advanced Studies, Tohoku University)

Full and co-opted council member of Academia NDT International
Detailed C.V.: researchmap
Citations: google scholar, T ohoku University Scholars
Funding: KAKENHI, KAKENHI＋JST(JP)
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Featured article by Los Alamos National Laboratory

Primary Research

Ultrasonic nondestructive evaluation
(Nonlinear ultrasonics for solids, ultrasonic phased array, phased-array programming, laser measurement, crack-sample fabrication, signal processing, numerical simulation)

Books

2020/02/18
Editors: K.-Y. Jhang, C. Lissenden, I. Solodov, Y. Ohara, V. Gusev
Measurement of Nonlinear Ultrasonic Characteristics
（Chap. 5 [pp. 165-234]: Y. Ohara, T. Mihara, K. Yamanaka
“Nonlinear Ultrasonic Phased Array for Measurement of Closed-Crack Depth”）
[Springer、Amazon]

2018/10/17
Editor: K. Kundu
Nonlinear Ultrasonic and Vibro-Acoustical Techniques for Nondestructive Evaluation
（Chap. 10 [pp. 419-469]: Y. Ohara, T. Mihara, K. Yamanaka
“Subharmonic Phased Array for Crack Evaluation (SPACE)”）
[Springer、Amazon]

Brief biography

Mar. 2002 B.E. Degree, Department of Mechanical Engineering, Nagoya Institute of Technology
Mar. 2004 M.E. Degree, Department of Mechanical Engineering, Nagoya Institute of Technology
Apr. 2005 JSPS Research Fellow DC2
Mar. 2007 Ph.D., Department of Materials Processing, School of Engineering, Tohoku University
Apr. 2007 Postdoc, New Industry Creation Hatchery Center (NICHe), Tohoku University
Mar. 2008 COE Fellow, Institute for Materials Research (IMR), Tohoku University
May 2008 Assistant Professor, Department of Materials Processing, Tohoku University
Apr. 2017　Associate Professor, Department of Materials Processing, Tohoku University
Feb. 2021-Present　Concurrent Professor, Division for the Establishment of Frontier Sciences of the Organization for Advanced Studies, Tohoku University (Concurrent Associate Professor until Mar. 2023)
Apr. 2023-Present　Professor, Department of Materials Processing, Tohoku University

Awards & Honors

Mar. 2023 The 81st Meritorious Award (The Japan Institute of Metals and Materials)
　　　”Development of innovative ultrasonic phased-array imaging methods for accurate crack sizing”
　　　　 Y. Ohara
Nov. 2022 Best Paper Award (The 42nd Symposium on Ultrasonic Electronics (USE2021))
　　　”High-resolution 3D phased-array imaging of fatigue cracks using piezoelectric and laser ultrasonic system (PLUS)”
　　　　(Japanese Journal of Applied Physics, Vol. 61, 2022, SG1044-1-10)
　　　　Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara
Dec. 2020 Co-Opted Council Member of Academia NDT International
　　　　Y. Ohara
May 2021 The Incentive Award (Miyagi Foundation for the Promotion of Industrial Science)
　　　”Development of Innovative 3D Ultrasonic Imaging Method”
　　　　Y. Ohara
Dec. 2020 Full Member of Academia NDT International
　　　　Y. Ohara
Sep. 2020 The 17th Murakami Incentive Award (The Japan Institute of Metals and Materials)
　　　”Development of Nonlinear Ultrasonic Phased Array for Accurate Measurement of Closed Cracks”
　　　　Y. Ohara
May 2019 The 40th Honda Memorial Incentive Award (The Honda Memorial Foundation)
　　　”Development of Nonlinear Ultrasonic Phased Array for Accurate Measurement of Closed Cracks”
　　　　Y. Ohara
May 2018 The 17th Incentive Award (Intelligent Cosmos Academic Foundation)
　　　”Development of Nonlinear Ultrasonic Phased Array for Accurate Measurement of Closed Cracks”
　　　　Y. Ohara
Mar. 2018 Excellent Education Award (Graduate School of Engineering, Tohoku University)
　　　”Public Relations & Brochures WG of Department of Materials Science and Engineering”
　　　　N. Tezuka, Y. Ohara, M. Kohda, H. Takamura
Dec. 2014 Best Paper Award (The 34th Symposium on Ultrasonic Electronics (USE2013))　　　　　　　　
　　　　”Evaluation of Crack Closure Stress by Analyses of Ultrasonic Phased Array Images during Global Preheating and Local Cooling”
　　　　(Japanese Journal of Applied Physics, Vol. 53, 2014, 07KC20-1-7)
　　　　K. Takahashi, K. Jinno, Y. Ohara, K. Yamanaka
Jul. 2014 Harada Young Research Award (The Honda Memorial Foundation)
　　　　”Study on Accurate Measurement of Closed Cracks by Nonlinear Ultrasonic Imaging Method”
　　　　Y. Ohara
Sep. 2013 The 23rd Incentive Award (The Japan Institute of Metals and Materials)
　　　　Y. Ohara
Oct. 2012 The 60th Anniversary Most Excellent Paper Award (The Japan Society for Non-Destructive Inspection)
　　　　”A Nonlinear Ultrasonic Imaging System for Detecting Minute Damage and Defects of nm Gaps in Industrial Materials”
　　　　(Journal of JSNDI, 54(9), (2005), 509-514.）
　　　　K. Kawashima, M. Murase, Y. Ohara, R. Yamada, M. Matsushima, M. Uematsu, F. Fujita, T. Miya
Sep. 2010 Best Paper Award (The Japan Society of Applied Physics)
　　　　”Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array”
　　　　(Japanese Journal of Applied Physics, vol.48, no.7, 2009, 07GD01-1-6)
　　　　Y. Ohara, H. Endo, T. Mihara, K. Yamanaka
Nov. 2009 Best Paper Award (The 29th Symposium on Ultrasonic Electronics (USE2008))
　　　　”Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array”
　　　　(Japanese Journal of Applied Physics, vol.48, no.7, 2009, 07GD01-1-6)
　　　　Y. Ohara, H. Endo, T. Mihara, K. Yamanaka
Mar. 2009 The 19th Incentive Award (Tokin Foundation for Advancement of Science and Technology)
　　　　”Development of Subharmonic Phased Array (SPACE) for Accurate Measurement of Closed Cracks”
　　　　Y. Ohara
Jan. 2009 The 14th Incentive Award (Aoba Foundation for the Promotion of Engineering)
　　　　”Development of Subharmonic Phased Array (SPACE) and Its Application to Accurate Measurement of Closed Cracks”
　　　　Y. Ohara
Sep. 2008 Excellent Presentation Award (The Japan Society of Applied Physics)
　　　　”Ultrasonic Evaluation of Stress Corrosion Cracks Using Subharmonic Phased Array”
　　　　Y. Ohara
May 2008 The 29th Academic Incentive Award (The Japan Society for Non-Destructive Inspection)
　　　　”Nonlinear Ultrasonic Imaging Method Based on Phased Array Using Laser Interferometer”
　　　　S. Yamamoto, Y. Ohara
Nov. 2005 Young Scientist Award (The 25th Symposium on Ultrasonic Electronics (USE2004))
　　　　”Effect of Adhesion Force between Crack Planes in Analytical Solution of Nonlinear Contact Vibration”
　　　　Y. Ohara
Jan. 2004 Best Presentation Award (The Japan Society for Non-Destructive Inspection)
　　　　”Detection of Micro Defects by Nonlinear Resonant Ultrasonic Method in Water”
　　　　Y. Ohara
Mar. 2002 Hatakeyama Award (The Japan Society of Mechanical Engineers)
　　　　Y. Ohara

Research Funding (PI)

JSPS KAKENHI (Grant-in-Aid for Challenging Research (Exploratory)) [2022-2024]
JSPS KAKENHI (Grant-in-Aid for Scientific Research (A)) [2021-2024]
JST FOREST [2021-2027]
JSPS KAKENHI (Grant-in-Aid for Challenging Research (Exploratory)) [2019-2021]
Advanced Research and Education Center for Steel (ARECS) [2018]
JSPS KAKENHI (Grant-in-Aid for Scientific Research (B)) [2015-2017]
JSPS KAKENHI (Grant-in-Aid for Challenging Exploratory Research) [2014-2016]
Advanced Research and Education Center for Steel (ARECS) [2013]
JSPS KAKENHI (Grant-in-Aid for Young Scientists (A)) [2012-2014]
JSPS KAKENHI (Grant-in-Aid for Challenging Exploratory Research) [2012-2013]
Ono Acoustic Research Grants [2011]
JSPS KAKENHI (Grant-in-Aid for Young Scientists (A)) [2009-2011]
Advanced Research and Education Center for Steel (ARECS) [2009]
Tohoku University (Grant-in-Aid for Young Scientists) [2008-2011]
Shoei Chemical Inc. [2008]
JSPS KAKENHI (Grant-in-Aid for JSPS Fellow) [2005-2006]

Primary Publications

Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara
“Exploring 3D Elastic-Wave Scattering at Interfaces Using High-Resolution Phased-Array System”
Scientific Reports, 12 (2022) 8291.
https://doi.org/10.1038/s41598-022-12104-9
press release
Y. Ohara, S. Haupert, S. Li
“Ultrafast Phased-Array Imaging with Pump Excitation for Closed-Crack Imaging”
Applied Physics Express, 14 (2021) 126505.
https://doi.org/10.35848/1882-0786/ac3d1e
Y. Ohara, M. C. Remillieux, T. Onuma, K. Tsunoda, T. Tsuji, T. Mihara
“Toward an Ultra-High Resolution Phased-Array System for 3D Ultrasonic Imaging of Solids”
Applied Physics Letters, 117 (2020) 111902-1-5.
https://doi.org/10.1063/5.0021282
press release Tohoku University, School of Engineering
Y. Ohara, H. Nakajima, S. Haupert, T. Tsuji, T. Mihara
“Nonlinear Ultrasonic Phased Array with Fixed-Voltage Fundamental Wave Amplitude Difference for High-Selectivity imaging of Closed Cracks”
The Journal of the Acoustical Society of America, 146(1) (2019) 266-277.
https://doi.org/10.1121/1.5116017
Y. Ohara, K. Takahashi, S. Murai, K. Yamanaka
“High-Selectivity Imaging of Closed Cracks Using Elastic Waves with Thermal Stress Induced by Global Preheating and Local Cooling”
Applied Physics Letters, 103 (2013) 031917-1-5
https://doi.org/10.1063/1.4816160
Y. Ohara, T. Mihara, R. Sasaki, T. Ogata, S. Yamamoto, Y. Kishimoto, K. Yamanaka
“Imaging of closed cracks using Nonlinear Response of Elastic Wave at Subharmonic Frequency”
Applied Physics Letters, 90 (2007) 011902-1-3.
https://doi.org/10.1063/1.2426891
press release
Please refer to researchmap, google scholar, and T ohoku University Scholars for other papers

International Collaborators (Our younger experts)

Dr. Sylvain Haupert (UPMC, France)
Dr. Guillaume Renaud (UPMC, France)
Dr. Jacques Riviere (Pennsylvania State University, USA)
Dr. Parisa Shoukouhi (Pennsylvania State University, USA)
Dr. Brian Anderson (Brigham Young University, USA)
Dr. Marcel Remillieux (Los Alamos National Laboratory, USA)
Dr. T. J. Ulrich (Los Alamos National Laboratory, USA)
Dr. Paul Johnson (Los Alamos National Laboratory, USA)
Dr. Pierre-Yves Le Bas (Los Alamos National Laboratory, USA)
Dr. Koen Van Den Abeele (KU Leuven, Belgium)
Dr. Cedric Payan (Aix Marseille University, France)
Dr. Lukasz Pieczonka (AGH University, Poland)