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根据烟圈理论 ,将发射源在地球中感应的电流线看成是随时间向下扩散的烟圈 ,称之为发射源象 .将源象在地表的磁场和源附近测得的响应磁场相对比 ,确定源象深度 ,由此用三次样条插值法求出源象扩散速度 ,并与均匀半空间中烟圈向下扩散的速度进行对比 ,从而近似估算出随深度变化的电阻率 .本文主要讨论圆形回线发射源情形 ,编制出相应的近似反演程序 ,并对一维层状理论模型和实测资料进行反演试验 .
According to the theory of smoke circle, the current line induced by the emitter in the earth is regarded as a smoke ring diffused downward with time, which is called the emission source image. The source magnetic field and the response magnetic field measured in the vicinity of the source are compared Ratio to determine the depth of the source image, thus using the cubic spline interpolation method to find the source image diffusion rate, and compared with the uniform half-space smoke ring down diffusion speed, so as to approximate the estimated depth-dependent resistivity. In this paper, we mainly discuss the case of a circular loop launch source and develop a corresponding approximation inversion procedure. The one-dimensional layered theoretical model and the measured data are inversely tested.