| 小波变换在管道弱超声回波奇异性检测中的应用 |
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| 引用本文： | 宋寿鹏,阙沛文.小波变换在管道弱超声回波奇异性检测中的应用[J].无损检测,2005,27(10):535-537. |
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| 作者姓名： | 宋寿鹏 阙沛文 |
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| 作者单位： | 上海交通大学,自动化检测研究所,上海,200030 |
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| 基金项目： | 国家海洋863计划(2001AA602021) |
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| 摘 要： | 研究了小波变换在细尺度下检测信号奇异性的原理。通过对样管中标准缺陷的超声回波分析试验,证明6层db5小波变换可以有效地分离出湮没在噪声中的微弱缺陷信号,并可以有效地分离出信号的孤立奇异点,准确定位缺陷出现时刻。
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| 关 键 词： | 超声检测 小波变换 信号分析 奇异性 |
| 文章编号： | 1000-6656（2005）10-0535-03 |
| 收稿时间： | 2004-09-13 |
| 修稿时间： | 2004年9月13日 |
Application of Wavelet Transform to Detecting the Singularity of the Weak Ultrasonic Echo in Pipes |
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| SONG Shou-peng,QUE Pei-wen.Application of Wavelet Transform to Detecting the Singularity of the Weak Ultrasonic Echo in Pipes[J].Nondestructive Testing,2005,27(10):535-537. |
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| Authors: | SONG Shou-peng QUE Pei-wen |
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| Affiliation: | Institute of Automatic Detection, Shanghai Jiaotong University, Shanghai 200030, China |
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| Abstract: | The theory of testing the signal singularity by wavelet transform under fine scale was studied.It was proved by the analysis of the ultrasonic echoes from the flaws in the pipe samples prepared that six-layer db5 wavelet transform could be used to separate weak flaw echoes from heavy noises effectively,extract the isolated singularity point and locate the arrival time of flaw echoes. |
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| Keywords: | Ultrasonic testing Wavelet transform Signal analysis Singularity |
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