基于双光栅夹角变化测量金属丝杨氏模量  

Measurement of the Young’s modulus based on angle-changed double grating

作　　者：王文硕 田星雨 严琪琪[2] 董国波[2] 熊畅[2] 胡浩哲 WANG Wen-shuo;TIAN Xing-yu;YAN Qi-qi;DONG Guo-bo;XIONG Chang;HU Hao-zhe(School of Automation Science and Electrical Engineering,Beihang University,Beijing 100083,China;School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100083,China;Beijing No.14 High School,Beijing 100053,China)

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100083 [2]北京航空航天大学物理学院,北京100083 [3]北京市第十四中学,北京100053

出　　处：《大学物理》2020年第8期58-63,共6页College Physics

基　　金：北京市自然科学基金(2161001)资助。

摘　　要：本文提出了一种利用双光栅夹角变化测量金属丝杨氏模量的方法.该方法利用莫尔条纹宽度对双光栅夹角变化的高度敏感性,将动光栅放置在杠杆平台上,将不同拉力下金属丝的微小线位移转化为由双光栅夹角变化而引起的莫尔条纹宽度的变化,进而计算得到金属丝的杨氏模量.实验表明,该方法操作简单,数据准确,精确度高,实验结果符合预期.A method of measuring Young’s modulus of metal wire by changing the double gratings’angle is presented.Based on the high sensitivity of Moirépattern about the changing angle,the movable grating is placed on a lever platform so that the weeny linear displacement can be turned into the width variation of the Moirépattern caused by the angular displacement between the two gratings.Correspondingly Young’s modulus of metal wire can be calculated.The experimental results have shown that this method is simple,accurate and in line with expectations.

关 键 词：双光栅 莫尔条纹 变夹角 微小位移 杨氏模量 

分 类 号：O4-34[理学—物理]