新型高频电磁发射机的大电流精细可变电感设计研究  

Research on the design of high-current fine variable inductance of new high-frequency electromagnetic transmitter

作　　者：杨树林 王猛[1,2] 苑益军[1] 张魁元 易学平 张荣薄 YANG ShuLin;WANG Meng;YUAN YiJun;ZHANG KuiYuan;YI XuePing;ZHANG RongBo(China University of Geosciences Beijing,Beijing 100083,China;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;710th Institute of China Shipping Group,Yichang 443003,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083 [2]地质过程与矿产资源国家重点实验室(中国地质大学),北京100083 [3]中国船舶集团公司第七一〇研究所,宜昌443003

出　　处：《地球物理学进展》2023年第6期2760-2767,共8页Progress in Geophysics

基　　金：国家重点研发计划项目(2022YFF0706200);国家自然科学基金(41874142);地质过程与矿产资源国家重点实验室科技部专项经费等联合资助。

摘　　要：可控源音频大地电磁法(CSAMT)是用于深部矿产资源和地质构造探测的重要方法之一.在长电偶源极距的情况下,受发射电缆中感抗的影响,发射机无法激发高频大电流,导致人工源高频信号还未传播至有效探测区域就已衰减殆尽.面对上述问题,本文基于串联谐振原理,开展了新型高频电磁发射机的大电流精细可变电感的理论设计和测试研究.所设计的可变电感由双磁芯、控制绕组和工作绕组等组成.控制绕组的直流输入电流改变了工作绕组磁芯的磁导率,实现了对串入发射机主回路工作绕组电感的精细控制,为发射回路处于谐振状态提供了硬件支撑.测试结果表明,用于自适应阻抗匹配装置的可变电感,可从根本上解决发射机无法激发高频大电流的问题.Controlled Source Audio-Frequency Magnetot-elluric Method(CSAMT)is one of the important methods for the exploration of deep mineral resources and geological structures.In the case of long electric dipole source distance,the transmitter is unable to excite high-frequency high-current due to the influence of inductive resistance in the transmitting cable,resulting in the artificial source high-frequency signal being attenuated before it can propagate to the effective detection area.Faced with the above problems,this paper carries out the theoretical design and test research of a new high-current fine variable inductor for high-frequency electromagnetic transmitters based on the principle of series resonance.The designed variable inductor consists of a double core,a control winding and a working winding.The DC input current to the control winding changes the permeability of the working winding core,enabling fine control of the inductance of the working winding in series with the main circuit of the transmitter and providing hardware support for the resonant state of the transmitting circuit.The test results show that the variable inductor used in the adaptive impedance matching device can fundamentally solve the problem of the transmitter's inability to excite high frequency high currents.

关 键 词：可控源音频大地电磁法(CSAMT) 高频大电流 精细可变电感 自适应阻抗匹配装置 磁调节 

分 类 号：P631[天文地球—地质矿产勘探]