Pipe inspection system using a polarized transverse wave EMAT

Riichi Murayama; Witsarut Sriratana; Kensuke Imai; Naoto Sonoda; Makiko Kobayashi

doi:10.1117/12.2053185

2 June 2014 Pipe inspection system using a polarized transverse wave EMAT

Riichi Murayama, Witsarut Sriratana, Kensuke Imai, Naoto Sonoda, Makiko Kobayashi

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 92340S (2014) https://doi.org/10.1117/12.2053185
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

The conventional non-destructive inspection of a pipe by an ultrasonic wave has low inspection efficiency because it is a technique that uses a longitudinal wave or transverse wave which propagates in the thickness direction of a pipe with a smaller area than the size of the ultrasonic sensor. However, a guide wave is provided with the characteristic of long range propagation in the axis direction of a pipe, so it is possible to detect many defects over a large pipe area at once. At present, there is a technique to generate a guide wave using a piezoelectric element (PZT). Such a transducer has some difficulties in industrial applications, which requires a high viscosity couplant. Therefore, we tried to develop a guide wave inspection system that uses an electromagnetic ultrasonic transducer (EMAT) which does not require any couplant. First, we confirmed that a guide wave can be transmitted and received in an aluminum pipe by a polarized shear horizontal transverse wave-EMAT, and we have confirmed the most suitable transmission and reception EMAT’s specification and the most suitable drive conditions to generate the L, T and F-mode guide waves. Finally, the detection performance has been evaluated by the developed system.

Citation Download Citation

Riichi Murayama, Witsarut Sriratana, Kensuke Imai, Naoto Sonoda, and Makiko Kobayashi "Pipe inspection system using a polarized transverse wave EMAT", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 92340S (2 June 2014); https://doi.org/10.1117/12.2053185

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