基于固有频率和迈克耳孙干涉测杨氏模量

Measuring Young modulus based on natural frequency and Michelson interference

基于材料的固有振动性质,结合迈克耳孙干涉测量的高精度,将待测材料和全反镜进行固性连接,通过测量干涉中心点光强的周期变化研究材料的固有振动频率,计算出材料的杨氏模量.实验将测量对象转换为振动频率,间接测量杨氏模量.同时,振动频率的变化可以通过示波器直观显示,固有频率振动稳定且起振操作简单,可通过增加周期数量减小误差.

Based on the natural vibration of the material and the high precision of Michelson interferometry,the tested material was solidly connected to the total reflection mirror.Then the natural vibration frequency was studied by measuring the periodic change of light intensity at the interference center point,thus the Young modulus was calculated based on the relation between the modulus and the natural frequency.In the experiment,the measured quantity could be converted into vibration frequency,and Young modulus was measured after that.At the same time,the change of vibration frequency could be directly displayed on oscilloscope,and the natural frequency retained stable and the operation of vibration was simple,and the measured error could be reduced by increasing the number of cycles.