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Pipe Inspection System by Guide Wave Using a Long Distance Waveguide

Pipe Inspection System by Guide Wave Using a Long Distance Waveguide

作     者:Riichi Murayama Kenshi Matsumoto Kenji Ushitani Makiko Makiko 

作者机构:Department of Intelligent Mechanical Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer Science and Electrical Engineering Kumamoto University Kumamoto Japan 

出 版 物:《Modern Mechanical Engineering》 (现代机械工程(英文))

年 卷 期:2015年第5卷第4期

页      面:139-149页

学科分类:1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主  题:Waveguide Guide Wave EMAT Nondestructive Inspection Pipe 

摘      要:In the industrial fields, many high temperature structures that require a non-destructive inspection exist. However, there are currently few sensors that can carry out non-destructive testing in a high temperature environment. In particular, the ultrasonic sensor is normally not used at over 50 degrees Celsius. Also, a special sensor for high temperature is currently available, but there are various constraints;it has not yet reached a level that is useful in industry. Therefore, we have been developing a new sensor system using a long waveguide which can transmit an ultrasonic wave from a long distance. Especially, this study focuses on applying the developed technique to a pipe which is used in a nuclear power plant. Therefore, the best rectangular-shaped waveguide was studied and attempted to be wound around a pipe to be driven by an acoustic source of a guide wave. Finally, the L (0, 2) and T (0, 1)-mode guide waves were successfully detected by optimizing the shape of the opposite edge of the rectangular-shaped waveguide that could detect the reflected signal from an artificial defect machined into a test pipe.

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