基于光栅衍射的弹性模量小角度测量

摘要

根据入射光偏转角度与光栅旋转角度的关系,实现了小角度的放大测量,并设计了实验装置应用于弹性模量中金属丝微小伸长量的测量.理论分析和实验数据表明其角放大倍数可超过传统光杠杆法的放大倍数.%According to the relation between the diffraction angle of the incident light and the rotation angle of the grating, the small-angle measurement was realized.An experimental scheme for measuring the small elongation of metal wire in elastic modulus measurement was provided.Both the theoretical and experimental results showed that the angular magnification exceeded the traditional optical-lever's magnification.