Study of two-dimensional inspection of thin sheets using Lamb wave

概要

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The Lamb wave inspection technique wich a tire transducer has been used for the on-line defect inspection of steel sheets. However, the conventional Lamb wave inspection process has the following two problems. One is the exietence of wide dead zones that appear in the near and far positions for the tire transducer. The other is misedetection due to parasitic echoes or electrical noises. Therefore, we have developed a method that could solve these problems using the two-dimensional signal characteristics. As a result, the dead zone and the misdetections can be reduced. This paper describes the measurement principle, the algerithm of the signal processing and the distinction logic. The results showed that the dead zone was reduced to 100mm from the strip edge and the misdetection was eliminated.
社団法人日本音響学会の論文