時間-周波数解析による超音波欠陥信号の弁別 : 第2報, 単一探触子による欠陥信号の弁別

概要

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The previous classification method^<(1)> which is based on a time-frequency analysis, can classify three types of artificial flaws ; side-drilled hole, flat-bottomed hole and slit. But this method requires two ultrasonic probes to distinguish these flaws. As this method is complicated, this paper examines the phase of flaw signal to develop a single ultrasonic probe method. The phase value of flaw signal is analyzed by STFT, a method of time-frequency analysis. As a result of analysis, it is clear that narrow slit causes a change of the phase value and there is a difference in the phase value between the side-drilled hole and the slit. In the previous method, the flat-bottomed hole can be distinguished from both the side-drilled hole and the slit by a probe of 6 mm aperture diameter. Therefore, by combining the previous and the present methods, a single ultrasonic probe method which can classify three types of artificial flaws is achieved.
一般社団法人日本機械学会の論文
1999-02-25