基于磁光调制的光弹性应力快速测量方法  

Fast measurement of photoelastic stress based on magneto-optical modulation

作　　者：马剑涛 吴泳波[1,2,3] 许伟鑫 刘楚彦 林立 林跃裕[1] 唐志列 

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]广东省光电检测仪器工程技术研究中心,广东广州510006 [3]广东省量子调控工程与材料重点实验室,广东广州510006

出　　处：《物理实验》2017年第12期45-49,共5页Physics Experimentation

基　　金：国家自然科学基金资助(No.61575067)

摘　　要：提出了基于磁光调制测量光弹性应力的方法,并设计了包括终端配套软件在内的一体化测量装置.通过贝塞尔函数展开推导应力大小及方向的公式,实验中仅需旋转起偏器一次来确定应力的实际方向,降低了旋转玻璃样品在装置设计上的难度;并利用磁光调制的方式正弦调制入射激光,通过检测光强频谱图精准判断消光位置,保证测量的精准度.实验结果表明,通过此方法测得的应力大小及方向精度高,完成一组测量的速度较快.多组测量数据的离散度较小,约1nm/cm,运用该方法对有应力分布的平板玻璃和受压玻璃进行测量并扫描成像,得到它们的应力分布图像.该方法能够准确、快速和无损地测量光弹性样品任意位置的应力.A new method for measuring the photoelastic stress using magneto-optical modulation was proposed,and an integrated measuring device was designed including the terminal supporting software.The formulas of stress magnitude and direction were deduced by Bessel expansion.The real direction of the stress was determined by rotating the polarizer only once,which reduced the difficulty in designing rotation device for glass sample.In addition,the incident laser was sinusoidally modulated by magneto-optical modulation,the extinction position was accurately determined through light intensity spectrum,and the accuracy of the measurement was ensured.The experimental results shown that the measurement of stress magnitude and direction by this method had high precision,and the speed of measurement was fast.The accuracy of the experimental setup was further illustrated by confirmatory experiments.A glass plate with internal stress and a glass sample subjected to compressive load,were scanned with this method separately,and their stress distribution were obtained.This method could measure the stress at any position in the photoelastic sample accurately,rapidly and nondestructively.

关 键 词：光弹性应力 磁旋光 应力测量 磁光调制 应力分布 

分 类 号：O348.1[理学—固体力学]