虚分量感应电磁法的一个变种

利用直流电法测量大地电导率,不仅其装备笨重给野外工作带来许多麻烦,而且测量信号中包含激发极化信号,测量数据不很准确。 目前采用的许多电磁感应法由于其异常值与电导率σ之间的函数关系很复杂,不能直观地看出其间的关系。所以,仅以异常值或相对异常值来表示不均匀体的响应,无疑是这类方法的一个缺点,不可能用地电断面的属性--电导率直接表示出异常值。

MODIFIED OUT-OF-PHASE ELECTROMAGNETIC METHOD

We present a kind of out-of-phase EM method. The relative response function and cumulative response function are formulated on base of the property that the secondary magnetic field in the near zone is out-of-phase when horizontal and vertical in-plane configurations are used. With these functions, the caculation methods of the forward and inverse problems for the layerd earth are developed.