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将常规的数字温度仪与压力计通过串行口和计算机连接,构建基于LabVIEW 8.0测定纯液体蒸发焓的虚拟仪器,实现实验数据的动态采集、实时显示、自动绘制p～T曲线并显示曲线方程、自动数据处理和写成结果报告等。应用结果表明:基于LabVIEW构建的测定纯液体蒸发焓的虚拟仪器,免除人工操作的繁琐和人为误差,测定乙醇和苯蒸发焓的相对误差分别为0.86%、-2.97%,提高了测量结果的准确度,且具有界面友好,操作简便和功能易扩展等诸多优点。
The conventional digital thermometer and pressure gauge are connected to the computer through the serial port to build a virtual instrument for measuring the enthalpy of evaporation of pure liquid based on LabVIEW 8.0 to realize the dynamic acquisition of experimental data, real-time display, automatic drawing of p ~ T curve and display of curve equation , Automatic data processing and report on results. The application results show that the relative error of the enthalpy of ethanol and benzene enthalpy determination is 0.86% and 2.97%, respectively, and the accuracy of the measurement results is improved. The virtual instrument for determining the enthalpy of evaporation of pure liquid based on LabVIEW can eliminate the cumbersome and human error of manual operation. Degree, and has a friendly interface, easy operation and easy expansion of features and many other advantages.