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针对电磁导波检测信号的缺陷识别问题,首先对信号进行离散小波包分解,提取出变化明显的子频带小波包系数进行重构,然后分析该重构信号瞬时相位和幅值的特征信息,通过对比不同缺陷情况下瞬时相位和幅值的变化趋势,得到缺陷特征,完成缺陷识别。
In order to solve the defect of electromagnetic guided wave detection, firstly, the signal is decomposed by discrete wavelet packet and the subband wavelet coefficients with obvious changes are extracted and reconstructed. Then the characteristic information of the instantaneous phase and amplitude of the reconstructed signal is analyzed. Compare the trend of instantaneous phase and amplitude under different defects, get the defect features, and complete the defect identification.