Journal
MEASUREMENT
Volume 42, Issue 1, Pages 164-169Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2008.05.003
Keywords
NDT&E; Optimal scale wavelet; Wavelet transform; Negentropy
Funding
- China National High-Tech Research and Development Program [2005AA602021]
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Various noise suppression techniques based on wavelet transform (WT) are widely used in non-destructive testing and evaluation (NDT&E). A weak ultrasonic signals identification method by using the optimal scale wavelet transform is proposed in this paper. The selection of the optimal scale is realized by maximizing the negentropy of the discrete wavelet transform (DWT) coefficients. The central frequency and bandwidth of the optimal scale wavelet matched that of the ultrasonic signal very well. Numerical and experimental results have been presented to evaluate the effectiveness of the optimal scale wavelet transform on ultrasonic flaw detection. This technique is a simpler and effective technique for processing heavy noised ultrasonic signals, and is greatly time-saving comparing with other typical wavelets transform. (C) 2008 Elsevier Ltd. All rights reserved.
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