测金属线膨胀系数的2种方法  

Two methods for measuring the linear expansion coefficient of metal

作　　者：刘肖一 王文彦 平澄 LIU Xiao-yi;WANG Wen-yan;PING Cheng(Department of Physics,Beijing Normal University,Beijing 100875,China;Teaching Center of Experimental Physics,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学物理学系,北京100875 [2]北京师范大学物理实验教学中心,北京100875

出　　处：《物理实验》2018年第11期54-57,共4页Physics Experimentation

摘　　要：根据迈克尔逊干涉仪的基本原理以及电容器的相关知识,设计了基于迈克尔逊干涉仪(光学方法)和基于平行板电容器(电学方法)的测量金属线膨胀系数的实验.对这2种方法的原理、实验装置、精度以及优缺点进行了比较.According to the basic principles of Michelson interferometer and the knowledge of capacitor,two experiments to measure the linear expansion coefficient of a metal bar were designed based on Michelson interferometer(optical method)and the capacitor(electricity method).The principles,experimental equipment,precision analysis,advantages and disadvantages of the two methods were compared.

关 键 词：迈克耳孙干涉仪 平行板电容器 线膨胀系数 微小位移 

分 类 号：O436.1[机械工程—光学工程]