Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system |
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Authors: | Boonsang S Dewhurst R J |
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Institution: | School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, M60 1QD, United Kingdom. |
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Abstract: | Enhancement of signal amplitudes from Rayleigh wave interaction at solid surface features has been investigated when signals were detected by an in-plane electromagnetic acoustic transducer (EMAT). A laser-ultrasound system was used to inspect surface-breaking slots, serving as artificial defects. Nd:YAG laser pulses were delivered onto a metal surface via an optical fiber and focused to a line source by a cylindrical lens. An in-plane EMAT receiver detected transient surface acoustic waves. A-scan signals and B-scan images from surface defects revealed increased signal amplitude up to 2.8+/-0.3 depending on the distance of the transducer from a slot. An explanation is based on the interaction of the EMAT sensor with the Rayleigh wave. A supporting computer model was derived to show that experimental signal enhancements were consistent with numerical predictions. |
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Keywords: | 42 62 −b 43 38 +n 43 35 Yb 43 20 Hq |
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