【摘要】 为了得到高信噪比、低失真度的涡流无损检测信号,以Matlab为仿真工具,对滑动窗口滤波法、频域滤波法、小波滤波法进行模拟仿真,对比滤波效果,确定小波阈值滤波为最终滤波方法,滤波参数为:Coif 3小波基、3层小波分解、启发式阈值,滤波后信号信噪比高、局部特征保留完整。更多还原

【Abstract】 In order to obtain the eddy current nondestructive detection signals with high signal-noise ratio and low distortion, Matlab is used as a simulation tool to simulate the method of sliding-window filtering,frequency domain filtering method and wavelet filter method. Comparison of the filtering results is done with threshold filtering of wavelet. Filtering parameters are as follows:coif 3 small fundamental, three-layer wavelet decomposition, heursure and soft–threshold wavelet. Testing results indicate filtering results with high signal-noise ratio and low distortion.更多还原