瞬变电磁实验教学模型系统设计  

Design of Transient Electromagnetic Experiment Teaching Model System

作　　者：滕飞[1] 孙德立 刘婷婷[1] 千承辉[1] TENG Fei;SUN Deli;LIU Tingting;QIAN Chenghui(College of Instrument and Electrical Engineering,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130061

出　　处：《吉林大学学报（信息科学版）》2020年第4期439-447,共9页Journal of Jilin University（Information Science Edition）

基　　金：教育部高等学校仪器类专业教学指导委员会基金资助项目(2018C003);吉林省教学改革基金资助项目(2015XZD031)。

摘　　要：针对地学仪器课程中瞬变电磁仪的实践教学需要,设计了一套瞬变电磁实验教学模型系统。该系统包括发射/接收一体机、接收传感器、异常线圈和上位机控制软件4部分。发射/接收一体机使用ARM(Advanced RISC Machine)控制器和CPLD(Complex Programmable Logic Device)作为主控单元,驱动H型全桥电路实现双极性方波的产生与发射;利用差分式空心线圈和双运放仪用放大电路设计了高灵敏度传感器;通过研究闭合线圈感应电动势与时间常数的关系,使用异常线圈模拟了良导电率有限导体;上位机控制软件使用C#语言在Visual Studio平台上开发。经测试,该模型能实时采集并显示瞬变电磁感应二次场衰减信号曲线,实现在实验室内模拟瞬变电磁仪工作过程,对课程的实践教学具有一定的辅助作用。In order to meet the practical teaching needs of the geoscience instrument course,a transient electromagnetic experiment teaching model system is designed.It includes four parts:a transmitting/receiving integrated machine,a receiving sensor,an abnormal coil and a host computer control software.The transmitting/receiving integrated machine uses the ARM(Advanced RISC Machine)controller and CPLD(Complex Programmable Logic Device)as the main control unit,and drives the H-type full-bridge circuit to realize the generation and transmission of a bipolar square wave.The high-sensitivity is designed using the differential hollow coil and the amplifier circuit for the dual op amp sensor.By studying the relationship between the induced electromotive force of the closed coil and the time constant,an abnormal coil is used to simulate a good conductive finite conductor.The host computer control software is developed on the Visual Studio platform using C#language.After testing,this model can collect and display the transient electromagnetic induction secondary field attenuation signal curve in real time,realize the simulation of the working process of the transient electromagnetic instrument in the laboratory,and have a certain auxiliary effect on the practical teaching of the course.

关 键 词：瞬变电磁 教学模型 异常线圈 复杂可编程逻辑器件 

分 类 号：TP242.6[自动化与计算机技术—检测技术与自动化装置]