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瞬变电磁法(Transient Electromagnetic Methods),简称为TEM。瞬变电磁法因其简单易行,在金属矿、油气田以及油田勘探等方面应用越来越广泛。瞬变电磁信号是对涡流电流产生的二次场进行观测得到的,二次场信号功率小,信号弱,容易受到干扰。尤其在存在工频干扰的地区采用瞬变电磁法进行探测时,工频干扰的存在会导致瞬变电磁信号产生严重的畸变,甚至完全被“淹没”。因此瞬变电磁法中工频噪声的压制是瞬变电磁探测工作中的一项重要又非常基础的工作。
Transient Electromagnetic Methods (Transient Electromagnetic Methods), referred to as TEM. Due to its simplicity and simplicity, the transient electromagnetic method has been applied more and more widely in metal mines, oil and gas fields and oilfield exploration. The transient electromagnetic signal is obtained by observing the secondary field generated by the eddy current. The power of the secondary field signal is small, the signal is weak, and the signal is easily disturbed. Especially in the presence of power frequency interference using transient electromagnetic method to detect, the existence of power frequency interference will cause transient electromagnetic signal generated serious distortion, or even completely “submerged ”. Therefore, the suppression of power frequency noise in the transient electromagnetic method is an important and very basic work in transient electromagnetic detection.