| 小波变换的原理及其在噪声材料超声评价中的应用 |
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| 引用本文： | 陈建忠,史淑,史耀武.小波变换的原理及其在噪声材料超声评价中的应用[J].宇航材料工艺,1999,29(3):27-33. |
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| 作者姓名： | 陈建忠 史淑 史耀武 |
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| 作者单位： | 1. 西安交通大学机械工程学院焊接研究所,西安,710049
2. 北京工业大学材料科学与工程学院,北京,100022 |
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| 摘 要： | 从信号自理的角度给出了小波变换的工程理解。小波变换可以看作从原始信号中不断抽取细节，最终只留下信号主干的过程。用小波变换对噪声材料粗晶奥氏体不锈钢中人工缺陷的超声Ａ型信号处理的结果表明，在对小波系数合理解释的情况下，小波换能有效地提高信噪比。
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| 关 键 词： | 超声波 无损评价 小波变换 粒晶材料 噪声材料 |
Use of Wavelet Transform in Ultrasonic Evaluation of Noisy M aterials |
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| Chen Jianzhong,Shi Shu,Shi Yaowu.Use of Wavelet Transform in Ultrasonic Evaluation of Noisy M aterials[J].Aerospace Materials & Technology,1999,29(3):27-33. |
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| Authors: | Chen Jianzhong Shi Shu Shi Yaowu |
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| Abstract: | From the signal processing point of view, perception of wavelet transform for engineers is given here. Wavelet transform is a process of keeping extracting details from primitive signals until only approximate is left. Ultrasonic A scan signals interrogating artificial defects in noisy material of coarse grain austenite stainless steel are analyzed by use of wavelet transform. The presented results show that wavelet transform affords an substantial technique to enhance signal to noise ratio of signals with serious noisy background, provided that appropriate insight into the wavelet coefficients. |
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| Keywords: | Ultrasonic Nondestructive evaluation Wavelet transform Coarse grain A scan Digital signal processing Signal to noise ratio |
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