弦长代替直径测量牛顿环曲率半径的不确定度的分析  

Uncertainty analysis of the curvature radius of Newton s rings with replacing the diameter by chord length

作　　者：文军 杨阳 梁振宇 史悦 WEN Jun;YANG Yang;LIANG Zhen-yu;SHI Yue(Department of basic courses,PLA Army of Border and Coastal Defense Academy,Xian 710108,China;School of Science,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]陆军边海防学院基础部,陕西西安710108 [2]中国民用航空飞行学院理学院,四川广汉618307

出　　处：《大学物理》2024年第9期35-39,共5页College Physics

基　　金：中央高校基本科研业务费专项资金(PHD2023-060,XSB2023-122,ZJ2022-003,JG2022-27,J2021-060)资助。

摘　　要：牛顿环实验中,测量干涉环的直径是本实验的重点与难点.本文将证实一个结论:弦长代替直径,测量牛顿环曲率半径的方法会影响结果的B类不确定度.当线性拟合的相关系数非常接近1时,B类不确定度不可以被忽略.另外,从理论上分析了弦长代替直径的测量方法所具备的优势,给出了因变量B类不确定度的计算方法.In the experiment of Newton s ring,measuring the diameter of interference ring is the key and difficult step.It is confirmed in this paper that the type B uncertainty of the curvature radius of Newton s rings is affected when the parameter measured is the chord length rather than the diameter.The type B uncertainty can not be ignored when the linear correlation coefficient approaches tO1.In addition,the advantages are analyzed when measuring the chord length instead of the diameter on the basis of theoretical analysis,the method of calculating the type B uncertainty is alsOgiven.

关 键 词：牛顿环 干涉环直径 弦长 线性拟合 

分 类 号：O4-34[理学—物理]