JASMI  Vol.2 No.3 , September 2012
Guided Waves Mode Discrimination in Pipes NDT Based on the Matching Pursuit Method
ABSTRACT
Ultrasonic guided wave have the multi-modes and dispersive characteristics, and its modes are easy to be converted at boundary or when running into defects in pipes, which makes the discrimination of different guided waves modes of the reflection signals in pipes NDT very hard. In this work, firstly, the experiments are carried out to test two kinds of stainless steel pipes by applying guided waves NDT, one is integrated pipe and another is non-integrated pipe with a small hole defect, and the detected guided waves echo signals are respectively obtained. Secondly, the measured signals are processed by matching pursuit method and the Chirplet matching atom parameters are calculated. By calculating the time-frequency distributions spectrum of detected guided waves echo signals, torsional, flexural and longitudinal guided waves modes are identified from the intact pipe, and the two wave-packets with torsional and flexural guided waves modes are also identified from the pipe with hole defect. The results showed that the matching pursuit method has a tremendous advantage to identify different guided waves modes in pipes nondestructive testing.

Cite this paper
Y. Wang, C. Shen, L. Zhu and F. Sun, "Guided Waves Mode Discrimination in Pipes NDT Based on the Matching Pursuit Method," Journal of Analytical Sciences, Methods and Instrumentation, Vol. 2 No. 3, 2012, pp. 149-155. doi: 10.4236/jasmi.2012.23024.
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