Pipe inspection system of a pipe by three-modes guide wave using polarized-transverse wave EMATs

Riichi Murayama; Jie Weng; Makiko Kobayashi

doi:10.1117/12.2074814

4 March 2015 Pipe inspection system of a pipe by three-modes guide wave using polarized-transverse wave EMATs

Riichi Murayama, Jie Weng, Makiko Kobayashi

Proceedings Volume 9302, International Conference on Experimental Mechanics 2014; 93022T (2015) https://doi.org/10.1117/12.2074814
Event: International Conference on Experimental Mechanics 2014, 2014, Singapore, Singapore

Abstract

Conventional non-destructive inspection of a pipe by ultrasonic wave has difficulty with inspection efficiency because it is a technique to apply by using longitudinal wave or transverse wave which propagates to the thickness direction of a pipe for smaller area than an ultrasonic sensor. However, a guide wave is provided with a characteristic of long-range propagation to the axis direction of a pipe, so it is possible to detect a lot of defects through wide range of a pipe at once. At present, there is a technique to generate a guide wave by a piezoelectric element (PZT). Such transducer has some difficulties to use in industrial application, which is required high viscosity couplant. Therefore we tried to develop a guide wave inspection system to use an electromagnetic ultrasonic transducer (EMAT) which doesn’t require any couplant. First, we could confirm that guide wave can be transmitted and received in aluminum pipe by a shear horizontal polarized-EMAT, and we have confirmed the most suitable transmission and reception EMAT-specification and the most suitable drive condition to generate for L, T and F-mode guide wave. Finally, we have evaluated the detective performance using the developed system.

Citation Download Citation

Riichi Murayama, Jie Weng, and Makiko Kobayashi "Pipe inspection system of a pipe by three-modes guide wave using polarized-transverse wave EMATs", Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93022T (4 March 2015); https://doi.org/10.1117/12.2074814

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