基于LabVIEW的单臂、双臂电桥仿真实验系统开发

Development of simulation experiment for Wheatstone bridge and Kelvin bridge based on LabVIEW

针对大学物理实验中的直流电桥测电阻实验,统一了单臂电桥和双臂电桥中流过检流计的电流强度计算公式.以Lab VIEW为开发工具,设计了一套集直流单臂、双臂电桥测试功能于一体的虚拟仿真实验系统,实现了单臂电桥测量中值电阻和双臂电桥测量低值电阻的全部功能.在大学物理实验教学中,将虚拟仪器用于实验教学,辅助讲解教学难点,有效地提高了教学质量;将虚拟仿真实验通过VI生成应用程序(EXE)放在校园网上,用于信息化教学,为学生预习、复习提供了自主学习空间.

Aiming at the experiment of Wheatstone bridge and Kelvin bridge,the current intensity through the galvanometer in the single bridge and double bridge is expressed by a unified formula. Based on LabVIEW,a platform of virtual simulation experiment for DC bridge with the full function of Wheatstone and Kelvin bridges is designed. The two bridges are applied to measure the middle value resistance and low value resistance separately. In the classroom,the virtual instrument is used for the experiment teaching,which is useful to explain the difficulty of teaching and improve the teaching quality effectively. The sharing of the application（ EXE） of the virtual simulation experiment on the campus network provides autonomous learning space for students. It is also used for informationized teaching for college physics experiment.