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缺陷漏磁场的Ｙ分量是漏磁检测中最常检测的物理量。该文针对前人研究中有关宽度作用的矛盾结论，着眼于表面裂纹的量化检测，从整个场的分布角度，采用有限元方法研究了相同深度（０．２ｍｍ）不同宽度（０．０２～１．０ｍｍ）两维矩形槽的漏磁场Ｙ分量的分布特点，得到了宽度变化时漏磁场的分布规律，提出了如何利用检测到的Ｙ分量获取裂纹宽度信息的方法。给出了宽度对检测中最重要的漏磁场Ｙ分量峰－峰值大小的影响曲线。上述工作有助于全面认识宽度对漏磁场的作用，实现不同宽度、深度的表面裂纹量化检测。
The Y component of the defect leakage magnetic field is the most commonly detected physical quantity in the magnetic flux leakage test. In this paper, based on the contradictory conclusions about the role of width in previous studies, focusing on the quantitative detection of surface cracks, the finite element method was used to study the effects of different widths (0.02 ~ 1 .0mm) two-dimensional rectangular slot leakage magnetic field Y component distribution characteristics obtained when the width of the leakage magnetic field distribution, proposed how to use the detected Y component to obtain the width of the crack information. The effect of width on the peak-to-peak magnitude of the Y-component of the most important leakage magnetic field is given. The above work helps to fully understand the effect of width on the leakage magnetic field and realize the quantitative detection of surface cracks with different widths and depths.