基于LabVIEW的热敏电阻测量虚拟仿真实验

Virtual Simulation Experiment of Thermistor Measurement Based on LabVIEW

以惠斯通电桥为基础,用LabVIEW成功搭建“热敏电阻测量”虚拟仿真实验平台。对负温度系数热敏电阻进行研究,实现了重要参数A值和B值的连续可调。在仿真实验中,通过改变实验温度测得对应的热敏电阻阻值,并实时记录在“数据采集与分析”模块。仿真平台可自动对实验数据进行拟合,直接显示出热敏电阻的温度曲线及其斜率和截距的具体数值,并计算出A值和B值。多次仿真结果显示,所测热敏电阻A值和B值的相对误差均在1.0%以下,具有较高精度。该虚拟仿真实验平台实现了传统实验室的全部功能,具有良好的可视化效果,其设计思路可推广到其他实验。

Based on the Wheatstone bridge,the virtual simulation experiment platform of “hermistor measurement”was successfully built by using LabVIEW.The thermistor with a negative temperature coefficient is selected as the research object,and the platform realizes the continuous adjustment of two important parameters,A value and B value.During the virtual simulation process,the user measures the corresponding thermistor resistance by changing the experimental temperature,and records it in the “data acquisition and analysis”odule in real-time.Subsequently,the simulation platform can automatically perform fitting of the experimental data,directly display the temperature curve of the thermistor in real-time,give the specific values of its slope and intercept,and finally,calculate the A value and B value.The results of multiple simulations show that the relative error of the measured thermistor A value and B value is below 1.0%,which has high accuracy.The virtual simulation experiment has successfully realized all the functions of “thermistor measurement in the laboratory”and possesses a good visualization effect.Its design ideas can be applied to the construction of other experiment virtual simulation platforms.