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1. Signal Matching Wavelet for Ultrasonic Flaw Detection in High Background Noise | |||
Shi Guangming,Chen Xuyang,Song Xiaoxia,Qi Fei,Ding Ailing | |||
Electrics, Communication and Autocontrol Technology 25 May 2010 | |||
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Abstract:It is very important to detect the flaw echoes for ultrasonic nondestructive evaluation in high background noise. The existing methods based on wavelet transform (WT) mainly use a wavelet basis to match a signal. As is well known, there are dozens of wavelet modes in all, whereas the signal may appear in various forms in practical application. Then the optimal match between the wavelet basis and the signal is difficult to be generated due to the constraints of wavelet. In this paper we propose a method of signal matching wavelet (SMW) for ultrasonic flaw detection in high background noise. In SMW the transmitted signal is designed to be a wavelet mode for matching a wavelet basis. Since our method gets rid of the constraints of wavelet, the optimal match between the echo signal and a wavelet basis is easy to be achieved. And we analyze the energy distribution of ultrasonic signal and propose the energy matching criteria to design the transmitted signal, which guarantees the optimal match. Furthermore, we put forward a scheme for choosing system parameters and the parameter of transmitted signal to enhance the matching capacity. In addition, a low-rate equivalent discrete WT (DWT) structure based on polyphase decomposition is designed to reduce the hardware cost and farther facilitate practical application. Finally the simulative results show that SMW can efficiently detect the flaw under high background noise even for the SNR low to -20 dB, which cannot be obtained by using other methods to our best knowledge. | |||
TO cite this article:Shi Guangming,Chen Xuyang,Song Xiaoxia, et al. Signal Matching Wavelet for Ultrasonic Flaw Detection in High Background Noise[OL].[25 May 2010] http://en.paper.edu.cn/en_releasepaper/content/4373752 |
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