基于中值滤波的铁磁材料缺陷漏磁检测信号处理

漏磁检测反演问题主要是通过漏磁检测信号来反演出缺陷的轮廓尺寸等信息,由于漏磁检测反演问题具有不适定性,因此漏磁检测信号的精度对反演结果的准确性影响很大.实际检测漏磁信号中存在大量复杂的噪声信号,无法直接用其展开反演计算.一般漏磁信号中含有的噪声量包括高频噪声和基线漂移信号.为了过滤掉这些噪声,在中值滤波算法的基础上,将...

Signal processing of MFL detection of ferromagnetic material defects based on median filter

The inversion problem of MFL detection is mainly to reverse the contour size of defects through MFL detection signals. The inverse problem of MFL detection is ill posed, so the accuracy of MFL detection signals has a great impact on the accuracy of inversion results. There are a lot of complex noise signals in the actual detection of MFL signals, which can not be directly used for inversion calculation. Based on the median filter algorithm, this paper proposes a multilevel filter algorithm for MFL signal processing, which can eliminate the possible high frequency noise in MFL signal through the improved median filter algorithm of level 2, and then carry out the median filter of level 2 to eliminate the impact of low frequency baseline drift. The experimental platform is built to collect MFL signals and the filtering algorithm is studied, which proves that the filtering algorithm has good noise reduction effect on the original MFL signals.