根据裂纹的特点，可以把它近似为一个没有厚度的面缺陷，其作用由分布在裂纹面上的等效电流偶极子层代替。
Considering that the crack thickness is usually very small, it can be taken as a'surface defect' with zero thickness.
根据磁偶极子空间磁场分布，导出了在外部垂直方向弱磁场下管状工件表面细长缺陷产生的弱磁场法向分量的计算公式。
Based on the spatial distribution of magnetic dipole, the equation of the normal component of leakage magnetic field on the tube surface under low-intensity field was derived.
利用磁偶极子理论，建立稳恒微弱地磁场作用下管类试件线状缺陷段产生的漏磁场模型。
The magnetic leakage field distribution above linear defects of a tube sample under the geomagnetic field was modeled according to magnetic dipole theory.
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