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工程设计学报  2007, Vol. 14 Issue (5): 369-373    
工程设计理论、方法与技术     
 基于小波变换的反卷积技术
 乔华伟, 杨克己
浙江大学 现代制造工程研究所, 浙江 杭州 310027
Study on deconvolution technique based on wavelet transform 
 QIAO  Hua-Wei, YANG  Ke-Ji
Institute of Modern Manufacture Engineering, Zhejiang University, Hangzhou 310027, China
 全文: PDF(351 KB)   HTML
摘要: 为了提高薄层复合材料超声无损检测(UNDT)中A扫描信号时域分辨率,提出一种基于小波变换多分辨率分析的反卷积技术新方法。针对传统反卷积技术在信噪比(SNR)降低时提高时域分辨率能力有限以及稳定性较差的缺点,将小波变换应用到反卷积技术中,对超声脉冲回波信号进行不同频带内分解,选取其中一个低频带内信号单支重建后,将传统反卷积技术应用到所选信号进行处理。计算机模拟和实验结果表明,与传统反卷积技术相比,该方法在提高时域分辨率(特别是低信噪比时)能力方面有较大改观。
关键词: 薄层复合材料 超声无损检测时域分辨率小波变换    
Abstract: To increase A-scan signals’ time resolution of thin multilayer composite materials in ultrasonic nondestructive testing (UNDT), a new approach of deconvolution technique based on wavelet multi-resolution analysis was proposed. To solve the drawbacks of limited resolution in time domain and poor stability of conventional deconvolution technique when ratio of signal and noise decreased,wavelet was used in deconvolution to decompose ultrasonic echo signal in variousbands. And then one of these bands was selected and after reconstructing this band, deconvolution was applied. Computer simulation results indicated that comparing with conventional deconvolution technique, this method improved a lot in increasing resolution in time domain (especially under low ratio of signal and noise).
Key words: thin multilayer composite material    ultrasonic nondestructive testing (UNDT)    time resolution    wavelet transform
出版日期: 2007-08-28
基金资助:

国家重点基础研究发展计划(973计划)资助项目(2007CB707700)

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引用本文:

乔华伟, 杨克己.  基于小波变换的反卷积技术[J]. 工程设计学报, 2007, 14(5): 369-373.

QIAO Hua-Wei, YANG Ke-Ji. Study on deconvolution technique based on wavelet transform [J]. Chinese Journal of Engineering Design, 2007, 14(5): 369-373.

链接本文:

https://www.zjujournals.com/gcsjxb/CN/        https://www.zjujournals.com/gcsjxb/CN/Y2007/V14/I5/369

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