三维梯度矢量瞬变电磁仪的建模及其仪器研制  

Three-Dimension Gradient Vector for Transient Electromagnetic Method and Instrument Development

作　　者：李享元[1] 谢水清 罗剑堃 朱学慧[2] LI Xiang-yuan;XIE Shui-qing;LUO Jian-kun;ZHU Xue-hui(College of Electronic Information Engineering, South-Central University for Nationalities, Wuhan 430074, China;Experimental Teaching and Laboratory Management Center, South-Central University for Nationalities, Wuhan 430074, China)

机构地区：[1]中南民族大学电子信息工程学院,湖北武汉430074 [2]中南民族大学实验教学与实验管理中心,湖北武汉430074

出　　处：《测控技术》2019年第4期82-86,共5页Measurement & Control Technology

基　　金："十二五"国家科技支撑计划(2013BAK06B00);湖北省自然科学基金项目(BZY16014)

摘　　要：为了探索和解决瞬变电磁物探在空间信息解析方面存在多解性问题,提出三分量梯度矢量瞬变电磁法模型和仪器方案,解决瞬变电磁探测深度的计算依赖于地层电导率和磁导率的问题。新型模型和仪器采集探测点的二次场三分量数据,得到其梯度矢量方向和大小,结合测点之间的距离和空间三角函数关系,计算出探测方向中低阻体的方位和距离。新型瞬变电磁仪在煤矿工作面的超前探测得到试用,验证预期效果,推广到物探工程应用中。A novel forward model based on three-dimension gradient vector is proposed to improve interpretation precision and solve lower exploration depth deficiency of transient electromagnetic method (TEM). In this model, three-component forward model and algorithm for TEM are independent of the electrical resistivity and magnetic permeability of the underlying layer and cannot be accurately measured. According to the proposed model, a new TEM instrument was designed with three transmitter coils and three receiver coils to detect three- component induced voltages of TEM secondary field in the three axial directions, and according to received information, the gradient vector of secondary field could be calculated. The TEM survey depth can be derived accurately from the gradient vector and distance between survey points. The new TEM instrument has been tested in coalmines. The results show that the proposed model for TEM is fitted to geophysical exploration and forecasting exploration. The instrument can be used in the geophysical survey, such as groundwater, mineral and oil prospecting, metal detection, and geological mapping.

关 键 词：瞬变电磁法 一次场 二次场 感应涡流 三维 梯度矢量 探测深度 

分 类 号：TH763[机械工程—仪器科学与技术] TP216.1[机械工程—精密仪器及机械]