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Pipe Inspection System by Guide Wave Using a Long Distance Waveguide

Modern Mechanical Engineering 2015年第4期5卷 139-149页

作者： Riichi Murayama Kenshi Matsumoto kenji ushitani Makiko Makiko Department of Intelligent Mechanical Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer Science and Electrical Engineering Kumamoto University Kumamoto Japan

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.

关键词： Waveguide Guide Wave EMAT Nondestructive Inspection Pipe

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