基于劳埃德镜的光干涉法测梁的杨氏模量

Base on Lioyd Mirror to Measure Young's Modulus of Girder by Optical Interference Method

通过劳埃德镜利用杨氏双缝干涉原理测量横梁的杨氏模量,由梁中心的形变引起劳埃德镜位置变化对干涉条纹间距的影响,给出了梁的杨氏模量与干涉条纹间距变化之间的关系。通过实验证明该方法具有实验现象直观、原理通俗易懂、操作过程简单和测量精度可达纳米量级等优点,实验结果与标准值的相对误差为1.7﹪。

This method mainly uses the Young＇s double slit interference principle by Lioyd mirror,the deformation of the girder lead to the change of the Lioyd mirror＇ place,then the width of the interference stripes will also change,so there is a relation between the Young＇s modulus of girder and the width of interference stripes.This method has many advantages：visualized experimental phenomena,simple principle,simple operation process and nanometer order accuracy etc.The relative error between the experimental results and the standard value is 1.7﹪.