Reference wavelets used for deconvolution of ultrasonic time-of-flight diffraction (ToFD) signals
One major disadvantage of ultrasonic time-of-flight diffraction (ToFD) technique is the weakness of echoes which are diffracted from crack tips. This shortcoming, to some extent, can be overcome by application of proper signal processing techniques. Deconvolution techniques have shown to be quite effective for this purpose. A deconvolution process needs to use a reference wavelet in order to extract the required information from the signal. Accordingly, one of the major challenges in using deconvolution techniques is the choice of the reference wavelet. This paper discusses some of the problems encountered in the selection of the reference wavelet and proposes methods to overcome these problems. The angle-dependent deconvolution technique is one of these methods in which the reference wavelet used for processing each part of the signal is different from wavelets used for other parts. The principles of this method are described and its effectiveness is demonstrated by both simulation and experiment.
ultrasonic testing time-of-flight diffraction (ToFD) technique deconvolution wavelet
Farhang HONARVAR Amin YAGHOOTIAN
K. N. Toosi University of Technology, Pardis St., Mollasadra Ave., Vanak Sq.,Tehran 1999143344, Iran.
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1248-1256
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）