激电中梯装置感应耦合的自适应抑制方法  

Self-adaptive suppression method for inductive coupling of IP in mid-gradient array

作　　者：柳建新[1,2] 唐冬梅[1,2] LIU Jianxin TANG Dongmei(School of Geo-science and Info-physics, Central South University, Changsha 410083, China Hunan Key Laboratory of Non-ferrous Resources and Geological Hazard Detection, Central South University, Changsha 410083, China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色资源与地质灾害探查湖南省重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第12期4122-4131,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41674080)~~

摘　　要：为了实时有效地抑制感应耦合,基于中梯装置电磁感应耦合在时频双域的表现及斩波去耦的理论成果,提出一种激电中梯装置感应耦合的自适应抑制方法。在数字采集的基础上分析接收端波形的特点,确定感应耦合接近最小且激电信息逐渐增加的位置;通过波形整形和相位补偿找到接收端波形的起始位置,确定去耦时间宽度,结合斩波理论实现感应耦合抑制。利用该方法在阻容模拟电路、水槽模拟装置以及野外中梯装置进行感应耦合抑制实验。研究结果表明:自适应抑制方法能根据实时波形情况在保留大部分激电信息的基础上有效抑制感应耦合,显示了该方法用于激电中梯装置的可行性。To effectively inhibit inductive coupling in real-time, a self-adaptive suppression method for inductive coupling of IP in mid-gradient array was proposed based on wave-chopping decoupling theory and the performance of inductive electromagnetic coupling in mid-gradient array in time and frequency domain. The point where the inductive electromagnetic coupling was close to the minimum and where the induced polarization started to increase was calculated according to the characteristic of waveform on basis of data acquisition. Furthermore, the starting point of waveform was determined by waveform shaping technique and phase compensation technique. Decoupling time was determined. Experiment on RC model and flume model and physical arrays were conducted by using this method. The results show that the method can effectively suppress the inductive coupling on the basis of retaining most of the IP information, which verifies the reliability of this method.

关 键 词：自适应抑制 电磁感应耦合 激电效应 中梯装置 

分 类 号：P319.3[天文地球—固体地球物理学]