| 一种基于WMM的超声信号噪声抑制新方法 |
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| 引用本文： | 迟大钊,刚铁.一种基于WMM的超声信号噪声抑制新方法[J].焊接学报,2011,32(8):9-12. |
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| 作者姓名： | 迟大钊 刚铁 |
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| 作者单位： | 哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨,150001 |
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| 基金项目： | 国家自然科学基金资助项目，国际合作基金资助项目，黑龙江省自然科学基金资助项目 |
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| 摘 要： | 超声衍射时差（time of flight diffraction,TOFD）法存在接收的缺陷衍射信号能量低、易于被噪声干扰的问题.为了解决这一问题,根据TOFD法检测过程中两相邻测点回波中缺陷信号具强相关性、噪声信号具随机性的特点,在传统小波模极大值（waveletmodular maximum,WMM）方法的基础上...
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| 关 键 词： | 超声衍射时差法 噪声抑制 小波模极大值 |
| 收稿时间： | 2011/5/7 0:00:00 |
A novel WMM method based de-noising for ultrasonic signal |
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| CHI Dazhao and GANG Tie.A novel WMM method based de-noising for ultrasonic signal[J].Transactions of The China Welding Institution,2011,32(8):9-12. |
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| Authors: | CHI Dazhao and GANG Tie |
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| Affiliation: | State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Ultrasonic TOFD(time of flight diffraction) has the shortcoming of sensitive to noise for the lower amplitude in the tested signal. According to the characteristics that the defect waves have strong correlation and the noise non-correlation in TOFD tested two adjacent A-scan lines, an improved WMM(wavelet modular maximum) method based de-nosing is proposed. Computer simulated and weld tested signals are de-nosing processed by using conventional and improved WMM methods correspondingly. The experimental results show that the improved method is more effective in noise suppression and has better adaptability for different noise. Compared with the conventional method, the proposed technique can greatly improve the ability of identifying defect wave. |
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| Keywords: | ultrasonic TOFD de-noising wavelet modular maximum |
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