利用等厚干涉测量钢丝的杨氏模量

Measurement of the Young's Modulus of the Wire with the Equal Thickness Interference

测量杨氏模量常采用光杠杆法进行测量。而利用等厚干涉的方法可以比光杠杆法更精确地测出钢丝形变的变化量。目前利用等厚干涉测量杨氏模量的实验中多需借助显微镜进行观察及使用电脑对图像进行处理。本文提及的实验方法既可以用电脑进行图像处理,也可以直接用肉眼观察条纹的变化,使实验变得简单易行且精度也比较高,并能满足不同层次的数据处理的需要,可以作为一项综合性实验纳入大学物理实验中。

The young’s modulus is often measured by the optical lever method.The deformation of steel wire can be measured more accurately by the method of equal thickness interference than that of the optical lever method.At present,the measurement of the young’s modulus by the method of equal thickness interference requires the observation of the microscope and computer processing.The experimental method can not only do image processing by using a computer,but also observe the change of stripes directly with the naked eye,making the experiment more simple and high precision.It meets the needs of data processing of different levels,and can be used as a comprehensive experiment in college physics experiments.