| 基于小波分析的热障涂层厚度超声检测 |
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| 引用本文： | 郑金华, 高鸿波, 张士晶, 石剑, 王婵. 基于小波分析的热障涂层厚度超声检测[J]. 失效分析与预防, 2014, 9(3): 136-140,150. DOI: 10.3969/j.issn.1673-6214.2014.03.002 |
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| 作者姓名： | 郑金华 高鸿波 张士晶 石剑 王婵 |
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| 作者单位： | 1.1. 无损检测技术教育部重点实验室(南昌航空大学), 南昌 330063 |
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| 摘 要： | 基于超声信号在涂层的上、下表面产生的奇异性，通过对超声信号进行连续小波变换分析，利用模极大值法和Lipschitz指数法进行判断，找出了超声信号中的奇异点。依据热障涂层界面反射信号的时间差，利用已知涂层声速可以算出涂层厚度。通过与扫描电镜所测涂层厚度对比分析，验证了该方法的可行性。
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| 关 键 词： | 热障涂层 超声测厚 小波变换模极大值 扫描电镜 Lipschitz指数 |
| 收稿时间： | 2014-03-10 |
| 修稿时间： | 2014-05-12 |
Ultrasonic Testing for Thinkness of Thermal Barrier Coatings Based on Wavelet Analysis |
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| ZHENG Jin-hua, GAO Hong-bo, ZHANG Shi-jing, SHI Jian, WANG Chan. Ultrasonic Testing for Thinkness of Thermal Barrier Coatings Based on Wavelet Analysis[J]. Failure Analysis and Prevention, 2014, 9(3): 136-140,150. DOI: 10.3969/j.issn.1673-6214.2014.03.002 |
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| Authors: | ZHENG Jin-hua GAO Hong-bo ZHANG Shi-jing SHI Jian WANG Chan |
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| Affiliation: | 1.1. Key Laboratory of Nondestructive Testing ( Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China |
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| Abstract: | Due to the singularity of the ultrasonic signals from the top and bottom surfaces of the coating, the ultrasonic signals can be analyzed through continuous wavelet transform. And the methods of the modulus maxima and Lipschitz exponential were exploited to determine the singularity of the ultrasonic signals. Therefore, the time difference of the reflected signals on the coating interface can be obtained and thickness of the coating can be calculated by using a known speed of sound of the coating. Finally, the results are compared with the coating thickness measured by the SEM to verify the feasibility of this method. |
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| Keywords: | thermal barrier coating measure the thickness using ultrasound wavelet transform of the modulus maxima SEM Lipschitz index |
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