缺陷漏磁信号的量化问题是漏磁信号研究领域中的一个重要方向。对缺陷漏磁信号进行FFT变换，根据变换后缺陷信号的幅值谱序列，对漏磁信号的信息熵进行了特征提取。利用提取的信号特征量，结合BP网络，完成了缺陷信号长度、深度的量化，量化精度分别达到了88.48%和84.17%。理论分析与试验研究证明了信息熵应用于漏磁信号量化过程中的可行性。

The quantization of defect magnetic flux leakage signal is always an important direction in the field of magnetic flux leakage signal processing. In this paper, Fourier transform was applied to magnetic flux leakage signals. By the use of the amplitude spectral sequence of defect magnetic flux leakage signal, information entropy was extracted. The length and depth of defect were quantified through the combination of signal characteristic and BP network, and the quantization precision was estimated reach 88.48% and 84.17%. It was proved that information entropy was feasible in the quantization of defect magnetic flux leakage signal by theoretical analysis and experimental study.