Wavelet-transform-based method of analysis for Lamb-wave ultrasonic NDE signals
Wavelet-transform-based method of analysis for Lamb-wave ultrasonic NDE signals
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DOI：
10.1109/imtc.1999.776987
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发表时间：
1999-05
期刊：
影响因子：
--
通讯作者：
S. Legendre;D. Massicotte;J. Goyette;T. Bose
中科院分区：
文献类型：
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作者：
S. Legendre;D. Massicotte;J. Goyette;T. Bose
我们提出了一种使用兰姆波作为探头的新型声学无损检测方法。这些波由电磁声换能器 (EMAT) 生成和接收。根据反射信号主峰的到达时间计算被测结构中的缺陷位置。由于接收信号的噪声性质，我们使用小波变换算法来提取所需的时间信息。这种多尺度信号分析方法的主要优点是适合检测峰值问题，尤其是在高噪声环境中。我们解释了如何进行特征提取，并提出了两种重建被检查结构图像的方法。给出了真实世界超声兰姆波信号分析的结果，包括合成和实验噪声信号的情况。
We present a new acoustic nondestructive testing method which uses Lamb waves as the probe. These waves are generated and received by an electromagnetic acoustic transducer (EMAT). The position of flaws in the structure under test is computed from the time of arrival of main peak of the reflected signal. Due to the noisy nature of the received signal, we use a wavelet transform algorithm to extract the required time information. The main advantage of such a multi-scale method of signal analysis is to be suitable for detection peak problems especially in highly noisy environment. We explain how we proceed to do the feature extraction and proposed two methods for reconstructing the image of the inspected structure. Results of real-world ultrasonic Lamb wave signal analysis are presented, including the case of synthetic and experimental noisy signals.