PS25 非接触透過計測のための集束空気超音波センサーの開発(フェロー賞対象ポスターセッション)

概要

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A new type of focused air-coupled ultrasonic transducer for non-contact measurements in transmission configuration is presented. The transducer has acoustic impedance matching layer with a special focused acoustic lens. The acoustic lens is designed to generate not only a longitudinal wave but also a shear wave and/or a plate wave in the specimen which is a steel plate of 2.8 mm. Numerical simulations with a fmite difference method have performed to verify the performance of the newly designed transducer. Based on the result, the transducers have been fabricated and it has been demonstrated that the intensity and signal-to-noise ratio of the transmitted signals through a steel plate are higher than those obtained using a conventional focused air-coupled ultrasonic sensor. Thus, it is expected that the developed transducer could be a useful tool for making quantitative evaluation of a nugget of spot weld.
一般社団法人日本機械学会の論文
2010-10-09