Evaluation of the Slit Detectability of the Point-focusing Electromagnetic Acoustic Transducer in SUS304 Steel

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  • 点集束型電磁超音波センサのSUS304鋼におけるスリット検出性能の評価
  • テン シュウソクガタ デンジ チョウオンパ センサ ノ SUS304コウ ニ オケル スリット ケンシュツ セイノウ ノ ヒョウカ

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Abstract

A 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.

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