拉脱法测量液体表面张力系数的电压测量点讨论与优化

doi:10.14139/j.cnki.cn22-1228.2023.03.004

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拉脱法测量液体表面张力系数实验中，力敏传感器对外输出电压是实验需要测量的重要参量。明确电压的测量点对于深入理解实验原理，提高实验测量精确度具有十分重要的意义。本文在传统拉脱法测量液体表面张力系数实验原理的基础上，重点对测量过程中吊环及液膜的状态、受力变化以及电压随吊环带出液膜高度的变化情况展开研究。最终明确了实验中电压测量点的选取，修正了理论分析计算公式并进行了实验验证。验证结果表明：吊环在临界状态时，传感器对外输出电压U1 应选取电压读数最大值更符合实验原理；且吊环带起液膜的质量不能忽略，应纳入理论分析计算中才能得到更为精确的结果。该研究结果可为本实验的课程教学提供分析思路与参考。

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	庞　燕
	张　亮
	孟跃宇
	季振宇

关键词: 物理实验拉脱法表面张力电压测量相对误差

Abstract:

The output voltage of the force sensor is an important parameter to be measured in the experiment ofmeasuring liquid surface tension coefficient by pulled off method. lt is very important to understand theexperimental principle and improve the accuracy of the experimental measurement.lt focuses on the study of thestate of the ring and the liquid film ,the change of force and the change of voltage with the height of the liquidhilm carried out by the ring during the measurement process,based on the experimental principle of measuringliquid surface tension coefficient by traditional pulling method.Finally,the selection of voltage measurementpoint in the experiment is clarified, the theoretical analysis formula is modified and the experiment ayerification is carried out.The verification results show that when the sling is in the critical state , the sensoroutput voltage U, should be selected as the maximum value of the voltage reading,which is more consistentwith the experimental principle.Moreover,the quality of the liquid film can not be ignored and should beincluded in the theoretical analysis and calculation to get more accurate results.The research results canprovide analysis ideas and reference for the course teaching of this experiment.

Key words: physical experiment pulled off method surface tension voltage measurement relative error

出版日期: 2023-06-25 发布日期: 2023-06-25 整期出版日期: 2023-06-25

ZTFLH:

O4-33

引用本文:

庞　燕 , 张　亮 , 孟跃宇 , 季振宇 . 拉脱法测量液体表面张力系数的电压测量点讨论与优化 [J]. 大学物理实验, 2023, 36(3): 21-25.
PANG Yan, ZHANG Liang, MENG Yueyu, JI Zhenyu. Discussion and Optimization of Voltage Measuring Point for MeasuringLiquid Surface Tension Coefficient by Pulled off Method . Physical Experiment of College, 2023, 36(3): 21-25.

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http://dawushiyan.jlict.edu.cn/CN/10.14139/j.cnki.cn22-1228.2023.03.004 或 http://dawushiyan.jlict.edu.cn/CN/Y2023/V36/I3/21

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