摘要
利用计算机实时监测硅力敏传感器输出的电压信号,提高了测量的精确度和科学性。用硅力敏传感器和计算机实时监测水的表面张力系数为7.410×10-2 N/m,记录了吊环的受力情况,分析了电压曲线变化的原因。对实验过程中出现的自升现象进行了分析,自升现象的出现使得液膜变薄、液膜的重力可以忽略不计,使测量结果误差较小。通过对整个拉脱过程的受力分析,使学生更深入地理解了拉脱法和表面张力的深刻内涵。
The voltage signal of Si-resistance-strain force sensor was input the computer,and the precision and scientificalness of liquid surface tension coefficient apparatus was improved by using the computer real-time monitoring voltage signal.Surface tension coefficient of water was 7.410×10-2N/m,and the voltage curves were analyzed according to the force of ringlike slice.Auto-rising phenomenon was found in the experimental process,and the study showed that the measurement error was more less when auto-rising phenomenon happened,because liquid film would be thinner for auto-rising phenomenon and the gravity of liquid film was negligible.The students could grasp the connotation of pull-apart method and surface tension according to force analysis of pull-apart process.
出处
《实验技术与管理》
CAS
北大核心
2011年第4期46-48,57,共4页
Experimental Technology and Management
基金
国家自然科学基金项目(50677005)
辽宁省科技厅计划项目(2004220007)
关键词
表面张力
拉脱法
硅力敏传感器
surface tension
pull-apart method
Si-resistance-strain force sensor
