斜双镜光杠杆法测量金属丝杨氏模量  

The Optical Lever Based on Two Diagonal Mirror Used for Young’s Modulus Measurement

作　　者：肖林轩 杨阳 王晓威 闫涵 吴峰[1] 李晓兰[1] XIAO Linxuan;YANG Yang;WANG Xiaowei;YAN Han;WU Feng;LI Xiaolan(College of Science,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学理学院,天津300384

出　　处：《大学物理实验》2023年第1期54-58,共5页Physical Experiment of College

基　　金：天津市高等学校大学生创新训练计划项目(202010060041);天津理工大学校级教学基金项目(ZX20-06).

摘　　要：利用双镜多次反射可有效提高光杠杆法的放大倍数,但需要额外装置确定反射次数。提出了斜双镜光杠杆法,通过一面与光杠杆的镜面斜对放置的大平面镜与光杠杆组合精准控制反射次数为2级,增加光程的同时增加了一次角度变化,将放大倍数提升为传统杠杆法的4倍。理论分析并实验验证了斜双镜法用于测量金属丝的杨氏模量,实验结果与理论分析吻合良好,证实方法和理论的有效性。并且,在不大于80 cm的有限空间内,实现了高达84.36倍的放大倍数。The traditional method can effectively improve the magnification,but additional devices are needed to determine the reflection times.Through the combination of a large plane mirror placed in a slant to the mirror of the optical lever,the number of reflections is accurately controlled to 2 levels,and the optical path is increased while an angle change is increased.Finally,the magnification is increased to 4 times of the traditional lever method.Theoretical analysis and experimental results show that the oblique double mirror method is used to measure the Young’s modulus of metal wire.The experimental results are in good agreement with the theoretical analysis,which verifies the effectiveness of the method and theory.In addition,the amplification factor is as high as 84.36 times in the limited space not more than 80 cm.

关 键 词：光杠杆 杨氏模量 放大倍数斜双镜反射 

分 类 号：O435[机械工程—光学工程]