显微液下云纹干涉测试系统  

A Study of Microscopic Moire Interferometry in Liquid Medium

作　　者：邱宇[1] 亢一澜[1] 贾有权[1] 

机构地区：[1]天津大学

出　　处：《实验力学》1997年第1期92-97,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金;国家教委博士点基金

摘　　要：本文提出了一种具有超高灵敏度的显微液下云纹干涉法。首先使激光通过折射率ｎ＝１．６５７的液体，用氦氖激光即可获得２０８ｎｍ／条的位移场；其次，用高精度的晶体相移器配合微机图像采集和处理倍增技术，可获得５２ｎｍ／条的位移场，相当于１９２００线／ｍｍ的虚光栅，本系统光路简单。A microscopic moire interferometry method with ultra high sensitivity was developed for in plane displacement measuring.By the method,the specimen grating was first immersed into a liquid refractive medium(α Bromonaphthalene with refractive index n=1.657) to increase the virtual grating frequency.In this stage sensitivity of 208nm/fringe was obtained.Then,fringe shifting multiplication technique was used to improve the efficacy and sensitivity of 52nm/fringe (which may give a moire of 19200 lines per mm) was finally achieved.The optical and mechanical arrangement for the method is relatively simple and easy to adjusy.

关 键 词：光力学 云纹干涉 相移技术 细观力学实验 

分 类 号：O348.12[理学—固体力学]