基于自适应阈值正交小波变换兰姆波去噪方法

提出了基于自适应阈值正交小波变换兰姆波去噪方法 （WT-AL）。首先利用正交小波变换降低含噪兰姆波信号的自相关性,然后利用自适应阈值方法自适应地对不同尺度的正交小波变换系数进行阈值处理,最后利用小波重构获得重构信号。实验结果表明：该方法去噪后信号信噪比明显提高,均方误差明显降低。

Adaptive threshold Lamb wave denoising algorithm based on orthogonal wavelet transform

An algorithm of ultrasonic lamb waves signal denoising（WT-AL）is proposed based on the theory of orthogonal wavelet transform and adaptive threshold denoising method.The algorithm uses the orthogonal wavelet transform to reduce the self-correlation of ultrasonic flaw echo signal,and then different scales and threshold of orthogonal wavelet transform coefficients are handled by the adaptive threshold denoising method.The experimental results show that the algorithm can remove the noise which is contained by the lamb waves signals measured actually better.