Misc - MURATA Yorinobu

Influence of Reflectance on Measurement Accuracy in Shape Measurement Using Whole-Space Tabulation Method

島 淳, 藤垣 元治, 村田 頼信

日本実験力学会講演論文集 ( 日本実験力学会 )  ( 12 ) 36 - 40   2012

Optical setup for Sub-millimeter Order Displacement Measurement Using Speckle Interferometry with Retroreflective Sheet

田尻 貴大, 藤垣 元治, 村田 頼信

日本実験力学会講演論文集 ( 日本実験力学会 )  ( 12 ) 60 - 64   2012

Dynamic displacement distribution measurement of deforming structure using sampling moire camera

Takuya Hara, Motoharu Fujigaki, Yorinobu Murata （Part： Last author )

Proceedings of SPIE - The International Society for Optical Engineering ( SPIE )  8494   2012  [Refereed]

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A Sampling moire method is one of the convenient phase analysis methods. The accuracy of phase difference analysis is from 1/100 to 1/1000 of the grating pitches. This method is useful to a real-time deformation measurement because the two-dimensional phase analysis can be performed from a single shot two-dimensional grating image. We developed a sampling moire camera which can analyze the two-dimensional displacement images in real-time by using the sampling moire method. The camera is composed of a C-MOS sensor, an FPGA, memory modules and a USB interface. A twodimensional grating image on the object is taken by the CMOS sensor in synchronization with a camera trigger. The algorithm mentioned previous was written into the FPGA. The two-dimensional grating images analyzed from one-shot image by the FPGA and outputted in real-time. It is confirmed that the camera can measure static displacement in high accuracy. However, it is not confirmed that the camera can measure dynamic displacement in high accuracy. In this paper, the accuracy of dynamic displacement measurement by using sampling moire camera is confirmed. And the sampling moire camera was applied to measure dynamic displacement of train bridges while a train is passing. © 2012 SPIE.

DOI

Calibration method using sampling moire method for phase-shifting digital holography with multiple imaging devices

Motoharu Fujigaki, Ryosuke Goto, Yorinobu Murata （Part： Last author )

Proceedings of SPIE - The International Society for Optical Engineering ( SPIE )  8494   2012  [Refereed]

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Phase-shifting digital holography is a convenient method to measure displacement and strain distributions. To simplify the optical setup is required for producing more compact equipment. In this paper, a calibration method using a sampling moire method for phase-shifting digital holography with multiple imaging devices is proposed. It is, however, difficult to find the corresponding points on the each reconstructed images taken by each imaging sensors. A 2-D grating reference plate is used. The two-dimensional (2-D) phase map of the 2-D grating pattern can be analyzed accurately. The principle and the experimental results to apply to the deformation measurement are shown. © 2012 SPIE.

DOI

3Pb2-7 Study on Directionality Control by M-sequence Encoding Ultrasonic Transducer(Poster Session)

Yonenaka Hiroshi, Murata Yorinobu

Proceedings of Symposium on Ultrasonic Electronics ( Steering committee of symposium on ultrasonic electronics )  32   479 - 480   2011.11

1Pb-12 Study on Pulse Compression Ultrasonic Transducer Made with Piezoelectric Copolymer Films(Poster Session)

Yonenaka Hiroshi, Murata Yorinobu

Proceedings of Symposium on Ultrasonic Electronics ( Steering committee of symposium on ultrasonic electronics )  31   165 - 166   2010.12

1P1-C15 Development of Micro Robot Used in Liquid

SADAMORI Shingo, MIWA Masafumi, MURATA Yorinobu, TSUCHITANI Shigeki, KOSIMOTO Yasuhiro

ロボティクス・メカトロニクス講演会講演概要集 ( The Japan Society of Mechanical Engineers )  2006   "1P1 - C15(1)"-"1P1-C15(3)"   2006

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In this study, we present a new wireless driving and energy supplying method for micro robot system using external magnetic field. This study divides three parts. The first part is development of energy supply and signal transmission system which uses electromagnetic induction. Also applying magnetic field system to occur electro motive force was developed. The second part is development of propulsion system using IPMC flagellum. In the third part, a macro model robot system was assembled using stereo lithography technique, and it was tested. As a result, IPMC flagellum wireless drive by external magnetic field was succeeded.

Evaluation for the rolling fatigue in deep groove ball bearings using a new focusing ultrasonic transducer made of piezoelectric copolymer

The Third US-Japan Symposium on Advancing Applications and Capabilities in NDE   pp.259-265   2005

Evaluation for the rolling fatigue in deep groove ball bearings using a new focusing ultrasonic transducer made of piezoelectric copolymer

Y. Murata, H. Toda, M. Kiji, N. Oguma

The Third US-Japan Symposium on Advancing Applications and Capabilities in NDE     259 - 265   2005

視覚障害者のための超音波および光計測による障害物検知手法の提案 (第8回知能メカトロニクスワークショップ講演論文集) -- (S6. 屋外・非整備環境における画像応用)

渋田 実, 藤垣 元治, 村田 頼信

知能メカトロニクスワークショップ講演論文集 ( 〔精密工学会〕 )  8   137 - 140   2003.08

Residual Stress Measurement with Acoustoelasticity Using a New-type Grazing SH-wave Transducer

Murata Yorinobu, Toda Hiroki, Nakatani Fumiya, Umemoto Takayuki, Go Yoshihiro

Proc. of the International Conference on Advanced Technology in Experimental Mechanics 2003 ( The Japan Society of Mechanical Engineers )  CD-ROM publication   365 - 365   2003

Residual Stress Measurement with Acoustoelasticity Using a New-Type Grazing SH-Wave Transducer

MURATA Y.

Proc. of ATEM' 03, JSME-MMD   CD-ROM publication   2003

Residual Stress Measurement of Rolled Steel Plate by Acoustoelasticity

Proc. of the 11th Asia-Pacific Conference on Nondestructive Testing     2003

Proposal for Method to Inform Obstacle Position by Tactile

SHIBUTA Minoru, FUJIGAKI Motoharu, MURATA Yorinobu, MIWA Masafumi, MORIMOTO Yoshiharu

The JSME Symposium on Welfare Engineering ( The Japan Society of Mechanical Engineers )  2002 ( 2 ) 307 - 309   2002.11

Estimation of water-cement ratio in fresh concrete using ultrasonic wave

SUMIKAWA Kenta, TODA Hiroki, MURATA Yorinobu, FUTAGAMI Kengo

日本実験力学会研究発表講演会講演論文集   2   248 - 249   2002.08

Stress measurement with a high accuracy by Grazing SH-wave acoustoelasticity

NAKATANI Fumiya, TODA Hiroki, MURATA Yorinobu, UMEMOTO Takayuki

日本実験力学会研究発表講演会講演論文集   2   92 - 93   2002.08

A non-destructive testing for the integrity of EF joint of PE gas pipe with an ultrasonic transducer made of laminated piezoelectric copolymer films

MURATA Yorinobu, OGATA Toshiaki, TODA Hiroki

M&Mレイクサイドサマーシンポジウム講演論文集 ( 日本機械学会 )  2002   93 - 96   2002

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We have developed a wide-band ultrasonic transducer using a piezoelectric copolymer P (VDF-TrFE) in order to test the integrity of PE gas pipes with high resolution and sensitivity. Ultrasonic transducers with lower frequency characteristics are needed to test plastic material such as PE, which is easy to attenuate ultrasonic wave. Then, we tried to control the frequency characteristics of the transducers by laminating a few thin piezoelectric copolymer films. The performance of the transducers was evaluated by measuring the resonant characteristic of the transducers in frequency and detecting reflected wave from object in water and in PE. It has been found that in laminated ultrasonic transducers the thickness of electrode layers and adhesive layers affected to the frequency response of the transducers strongly. The developed transducer detected a small defect in PE gas pipes with big amplitude and a little ringing.

Development of a Wide-Band Ultrasonic Transducer with Low Frequency Characterictic Using Laminated Piezoelectric Copolymer

Y.Murata, T.Ogata, H.Toda

Proc. of the 6th Far East Conference on Non-Destructive Testing     135 - 140   2002

Non-Destructive Evaluation of the Integrity of Electrofusion Joint in PE Gas Pipes Using a Tocused Ultrasonic Transducer

Proc. of the 6th Far East Conference on Non-Destructive Testing   517-522   2002

Development of a Wide-Band Ultrasonic Transducer with Low Frequency Characterictic Using Laminated Piezoelectric Copolymer

Proc. of the 6th Far East Conference on Non-Destructive Testing   135-140   2002