박판에서 Wavelet Transform De-noising을 이용한 탄성파 발생원의 위치표정

초록

A new technique for the source location of acoustic emission(AE) in plates thinner than three times of the wavelength has been studied using wavelet transform de-noising scheme. The detected AE signals were pre-processed using wavelet transform to be decomposed into the low-frequency, high-amplitude flexural component and the high-frequency, low-amplitude extensional component. If the wavelet transform de-noising was done, we could successfully remove the extensional wave component, one of the critical errors in source location by arrival time difference method. The result of source location has been compared with the conventional technique by changing the sensor-to-sensor distance and the plates thickness.