传感技术学报2018，Vol.31Issue(2)：202-206,5.DOI:10.3969/j.issn.1004-1699.2018.02.008
基于电磁感应法的交变磁场测量电路设计
Design of Alternating Magnetic Field Measurement Circuit Based on Faraday Law of Electromagnetic Induction
摘要
Abstract
In order to measure the intensification of alternating magnetic induction,a circuit based on Faraday law is designed. The working principle and design idea of the circuit are described in detail. The measurements are ana-lyzed. The weak induced electromotive force is sensed by the hollow pick-up coil which is wound by enameled wires,and is amplified by the circuit module which consists of precision operational amplifiers. Then one way of the amplified signal is sent to a precision rectifier circuit from which output the root mean square voltage. Another way of the amplified signal is transformed to square wave with the same frequency through a compare and shaping cir-cuit. A microcontroller measures the root mean square voltage and the square wave frequency. It finally calculates the intensification of alternating magnetic induction. The measurement's percentage error is less than 5%,The result shows that the circuit is precisely,reliably and valueable.关键词
交变磁场传感器/磁场强度/感应电动势/精密全波整流/精密运放/频率测量Key words
alternating magnetic field sensor/magnetic density/induced electromotive force/high accuracy full wave rectifier/precision operational amplifier/frequency measurement分类
机械制造引用本文复制引用
黄剑平,穆瑞珍,林海峰..基于电磁感应法的交变磁场测量电路设计[J].传感技术学报,2018,31(2):202-206,5.基金项目
厦门理工学院教改课题项目(JGY201624 （）
JGZ201603) （）
