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Proceedings Paper

Transmission system of guide-wave for a pipe using a long distance wave guide
Author(s): Kenshi Matsumoto; Riichi Murayama; Kenji Ushitani
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Paper Abstract

Nondestructive inspection of a high-temperature structure is required to guarantee its safety. However, there are no useful sensors for high-temperature structures. Some of them cannot work at temperatures over 50°C.Another concern is that it is too expensive to use. Therefore, a sensing system, which can transmit and receive an ultrasonic wave and travel a long distance using a long waveguide, has been studied. This means that an ultrasonic sensor could be driven at atmospheric temperature. We could finally confirm that a guided ultrasonic wave generated by a trial electromagnetic acoustic transducer (EMAT) with a thin Ni sheet on the surface of the pipe can travel more than 10m using a thin bar with a 2mm diameter as the waveguide. However, we had difficulty in receiving a reflected ultrasonic wave from the bottom surface of a test specimen. We tried to improve the trial inspection system using an ultrasonic horn. Finally, an experiment in which the temperature of a test block was heated to about 500°C has been done and the reflected ultrasonic wave from the bottom surface of it has been successfully detected using a long waveguide and the wave horn. Finally, we tried to transmit and receive a guided wave in a pipe using the developed system. It was determined that an additional one turn-shaped or wave-shaped waveguide attached to the surface of the pipe in the circumferential direction is useful.

Paper Details

Date Published: 4 March 2015
PDF: 7 pages
Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93020K (4 March 2015); doi: 10.1117/12.2075240
Show Author Affiliations
Kenshi Matsumoto, Fukuoka Institute of Technology (Japan)
Riichi Murayama, Fukuoka Institute of Technology (Japan)
Kenji Ushitani, Fukuoka Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 9302:
International Conference on Experimental Mechanics 2014
Chenggen Quan; Kemao Qian; Anand Asundi; Fook Siong Chau, Editor(s)

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