光拍法测光速实验的改进与教学实践  

An improved method of light speed measurement and its application in teaching practice

作　　者：郭乃泉 马超 郑亮 吴娟[1] GUO Nai-quan;MA Chao;ZHENG Liang;WU Juan(School of Mathematics and Physics,China University of Geosciences(Wuhan),Wuhan,Hubei 430074,China)

机构地区：[1]中国地质大学(武汉)数学与物理学院,湖北武汉430074

出　　处：《大学物理》2022年第11期82-85,共4页College Physics

基　　金：中国地质大学(武汉)一般教学改革项目(2020A31)资助。

摘　　要：大学物理实验中,传统的光拍法测光速实验由于涉及两个不同光路下光拍信号的比较,存在较大的实验误差.本文提出了一种利用示波器的光标功能,仅对远程光相位和光程变化关系进行测量的改进方法,简单易行,可广泛应用到该实验的教学实践中.改进后的实验教学设计可以帮助学生更好地理解光拍法测光速的物理思想,也会对锻炼学生的批判性思维能力和科研中的探索精神起到一定作用.The traditional light speed measurement in college physics experiment course suffers from multiple uncertainties for comparing the light-beat signals in two different pathways.In this paper,an optimized method is developed by utilizing the cursor function of oscilloscope to measure the phase variation of only one light-beat signal,which achieves much better accuracy in a more operative way and can be easily applied to teaching practice of this experiment.It is found that the instructional design which incorporates this improved method will become more pedagogical to illustrate the essence of this measurement and help students develop critical thinking and spirits of exploration in scientific research.

关 键 词：光拍法 光速测量 教学实践 

分 类 号：O4-34[理学—物理]