Ultrasonic Signal Research of Multi-Layered Metal Structure Based on Morlet-P Wavelet
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摘要: 鉴于多层金属结构的超声检测信号夹杂了大量的噪声，湮没了有用的裂纹缺陷信息，在对信号作多尺度分析的基础上，构造了Morlet-P小波并以此对信号进行了各种分析。当取多个尺度参数时，基于Morlet-P小波变换得到的小波系数都包含了缺陷信号的频率成分，解决了多分辨率分析时多尺度小波系数在分析窄频带缺陷信号时的不足。Abstract: The ultrasonic testing signal of multi-layered metal structure includes a mass of noise, and the noise submerges completely the useful flaw signal. Morlet-P wavelet was constructed during the multi-scale analysis. When more than one scale parameter was applied to the continuous wavelet transform based on the Morlet-P wavelet, the wavelet transform coefficient still included the flaw characters. So the shortcoming of multi-resolution analysis on the narrowband signal was overcome.
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