在介绍了交变磁场测量原理的基础上，分析并给出了交变磁场测量法的数学和理论模型，对缺陷模型进行了详尽的分析。
On the introduce of alternative current field measurement (ACFM), the mathematic and theoretical model of ACFM were analyzed, and especially the flaw model at large.
根据交变磁场测量法(ACFM)的基本原理，设计了一种由激励线圈和感应线圈组成的交变磁场传感器，可对空间“点”磁场进行测量。
According to the basic principle of alternative current field measurement (ACFM), the alternative current field sensor was designed, which was made up of drive coil and induction coil.
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