Being a method of time - domain electrical magnetic surveying , the transient electromagnetic method ( tem ) can transmit first pulse electromagnetic field to underground making use of loop or electrical source and receive secondary induction field during of the pulse intermission 瞬变电磁法是一种时间域电磁测量方法，是利用不接地回线或接地线源向地下发送一次脉冲磁场，在一次脉冲磁场的间歇期间，采用不接地线圈接收感应二次磁场。
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As the single rectangular coil is the routine induction probe , the system is simulated based on the theory of a - v - a . the perfect induction field is studied . the corresponding relations between the slots and the field are also analyzed , as well as the measurement scale is given here )描述下交变磁场测量技术单矩形线圈激励形式下的数值仿真模型，从场量检测的角度出发，分析了无缺陷情况下该系统的电磁场分布特性，以及有缺陷情况下缺陷与场分布的对应关系以及缺陷检测的数值范围。
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