漏磁检测方法对检测结果作出评价的依据是漏磁信号。目前对漏磁信号的研究分为正、逆两个方向。正问题是指由缺陷到信号的研究，它往往是针对一定尺寸的缺陷来研究其产生的漏磁信号。逆问题则是指由缺陷的信号反推缺陷的形状，也就是所谓的反演。笔者以铁磁性平板的漏磁信号为基础，分别对缺陷识别、定位、量化等方面进行了深入研究，提出一种基于多通道的铁磁性平板腐蚀缺陷量化反演方法，实现了缺陷检测的可视化。

In the field of magnetic flux leakage testing, magnetic leakage signal is the basis of test results evaluation. The study of magnetic leakage signal can be divided into forward and inverse directions. The forward problem refers to the study which is from the defect of a certain size to the magnetic leakage signals that defect generate. While the inverse problem refers to making a reverse deducing from the magnetic leakage signals to the shapes of defects, it is so-called inversion. Based on magnetic flux leakage signals of the ferromagnetic floor, the defect recognition, defect location, disfigurement quantitative, and so on were deeply studied. A quantization inversion method based on multiple channels was raised, and the defect test visualization was realized.