平面镜的平移对杨氏模量影响的讨论

Investigations on the Influence of the Translation of Plat Mirror on Young Modulus

利用静力拉伸法测量杨氏模量是一个经典的实验,测量仪的组件——光杠杆的平面镜与两前尖处于同一竖直平面内,后尖足既细又长,使得光杠杆的重心处于支承面的边缘线上,这是一种典型的不稳定结构,在测量过程中存在光杠杆容易翻落摔坏的隐患,当把平面镜的位置平移后可改变不稳定结构的状况。为此对光杠杆平面镜位置平移前后的光路进行分析,讨论它对测量杨氏模量的影响。

It＇ s a classical experiment to measure Young modulus by static forve stretch. The flat mirror of light lever have three points, with two points in front and one behind. The former points and the flat mirror are in a vertical plan. And the latter point is not only straitness but also long. So the gravity of light lever is located on the marginal line of plan of underprop. This is a typical unsteady structure. In this condition, tranlating flat mirror makes structure tend to sterdy. By using the flat mirror of light lever, the relationship between light path and the Young modulus has been discussed.