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Volume 65, Issue 2
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Kazuhiro ASHIDA, Takashi TAKISHITA, Nobutomo NAKAMURA, Hirotsugu OGI, ...2016 Volume 65 Issue 2 Pages 79-84
Published: February 01, 2016
Released on J-STAGE: January 29, 2016
JOURNAL FREE ACCESSA point-focusing electromagnetic-acoustic transducer (PF-EMAT) was developed and the slit detectability was evaluated. Based on the Lorentz force mechanism, this EMAT generated shear-vertical (SV) waves from concentric line sources on the top surface of a stainless steel plate, and the SV waves were focused on the focal point on the bottom surface of the plate in phase. The focusing effect improved the spatial resolution and detectability of slit defects located on the bottom surface. An artificial slit as shallow as 0.05- mm deep was well detectable at 2 MHz. Effect of the in-plane incident angle of the SV waves to the slit face, reproducibility of the measurements, and the liftoff effect were evaluated.View full abstractDownload PDF (1753K)
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