摘要
电桥按照激励方式的不同可分为直流电桥和交流电桥,直流电桥具有平衡电路相对简单而更易实现的优点,但具有只适用于电阻变化的测量的局限性和易受到人工频率干扰的缺点,因而应用范围相对受限.交流电桥能够用来测量电阻器的阻值、线圈的电感量和电容器的电容及其损耗,因此其应用范围更加广泛.交流电桥的平衡条件相对较为复杂,需要电桥桥臂达到平衡时,由已知的电阻或电容、电感,通过公式,进而求出待测元件的参数变化.本文首先简要地介绍交流电桥的实验原理和平衡条件以及调节电桥的方法,其次通过交流电桥法测信号源频率实验对交流电桥的原理进行了验证,以进一步了解交流电桥的基本知识,学习交流电桥调节平衡的方法和技能,结论部分总结了交流电桥的特点及调节中的注意事项.
Electric bridges can be divided into the DC bridge and AC bridge according to the different excitation methods.The DC bridge has the advantages of relatively simple and easier to implement balanced circuits,but it has the limitation of being only suitable for resistance change measurement and the shortcoming of being susceptible to artificial frequency interference.Therefore,the scope of its application is relatively limited.The AC bridge can be used to measure the resistance of the resistor,the inductance of the coil and the capacitance and loss of the capacitor,so its application range is more extensive.The equilibrium condition of the AC bridge is relatively complicated.When the bridge arms of the bridge reach equilibrium,the known resistance,capacitance and inductance are used to calculate the parameter change of the component to be measured through a formula.This article first briefly introduces the experimental principles and balance conditions of the AC bridge and the method of adjusting the bridge.And then the principle of the AC bridge is verified by the experiment of measuring the signal source frequency by the AC bridge method.The purpose is to further understand the basic knowledge of the AC bridge,and learn the methods and skills of adjusting the balance of the AC bridge.In the conclusion part,the characteristics of the AC bridge and the precautions in the adjustment are summarized.
作者
齐晓华
朱一博
史冬梅
QI Xiaohua;ZHU Yibo;SHI Dongmei(College of Physical Science and Technology,Bohai University,Jinzhou 121013,China)
出处
《渤海大学学报（自然科学版）》
CAS
2021年第3期253-258,共6页
Journal of Bohai University:Natural Science Edition
基金
国家自然科学基金项目(No:11305017)
关键词
交流电桥
平衡条件
实验原理
the AC bridge
equilibrium condition
experimental principles
