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Matching-pursuit-based adaptive wavelet-packet atomic decomposition applied in ultrasonic inspection

  • Acoustic Methods
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Russian Journal of Nondestructive Testing Aims and scope Submit manuscript

Abstract

A novel method of time-frequency analysis, wavelet-packet atomic decomposition based on the matching-pursuit (MP) algorithm, is proposed for improvement of ultrasonic flaw detection during ultrasonic NDT. The MP algorithm is used to decompose a nonlinear and nonstationary signal into given atoms in an overcomplete wavelet-packet dictionary. The wavelet-packet dictionary with Daubechies wavelet functions, which well match the observed ultrasonic flaw echoes, is selected. By means of adaptively selecting the optimum atoms to reconstruct a signal, it is possible to obtain spare approximations of the original signal with less complexity and to efficiently improve a signal corrupted by noise. A distinct SNR enhancement for an ultrasonic echo during flaw detection is verified by computer simulation and experimental results.

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Authors and Affiliations

  1. Institute of Automatic Detection, Shanghai Jiaotong University, 200240, Shanghai, China

    Yang Guang, Zhang Qi & Que Pei-Wen

Authors
  1. Yang Guang
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  2. Zhang Qi
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  3. Que Pei-Wen
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The text was submitted by the authors in English.

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Yang, G., Zhang, Q. & Que, PW. Matching-pursuit-based adaptive wavelet-packet atomic decomposition applied in ultrasonic inspection. Russ J Nondestruct Test 43, 62–68 (2007). https://doi.org/10.1134/S1061830907010093

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  • DOI: https://doi.org/10.1134/S1061830907010093

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