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

被引：12
|
作者：
Guang, Yang [1 ]
Qi, Zhang [1 ]
Pei-Wen, Que [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Inat Automat Detect, Shanghai 200240, Peoples R China
来源：
RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING | 2007年 / 43卷 / 01期
关键词：
Nondestructive Test; Original Signal; Ultrasonic Signal; Ultrasonic Inspection; Ultrasonic Flaw;
D O I：
10.1134/S1061830907010093
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：62 / 68
页数：7
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