基于泰伯效应的面内位移测量  

In-plane displacement measurement using talbot effect

作　　者：孙海滨[1] 刘婷婷[1] 孙平[2] SUN Hai-bin;LIU Ting-ting;SUN Pingz(College of Physics and Electronic Engineering, Taishan University, Tairan 271000, China;School of Physics and Electronics,Shandong Normal University,Jinan 250014,China)

机构地区：[1]泰山学院物理与电子工程学院,山东泰安271000 [2]山东师范大学物理与电子科学学院,山东济南250014

出　　处：《光电子．激光》2018年第4期448-452,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61107012);山东省自然科学基金(ZR2017LA010)资助项目

摘　　要：为了测量物体的面内位移,设计了基于泰伯效应的变形测量实验方案。在实验中,把设计好的二维方孔光栅的全息图输入到由计算机控制的液晶空间光调制器(LC-SLM)中。当LC-SLM放置于物体前方适当距离时,物体表面形成清晰的泰伯像,再由CCD捕获物体变形前后的散斑图像。输出光场包含了物体变形位移的信息。利用数字散斑相关测量(DSCM)方法计算得到物体的位移。本文方案简单易行,可以作为测量物体变形位移的替代方案。实验结果表明,本文方法应用于面内位移测量是可行的。In order to measure the in-plane displacement, a scheme to measure the displacement of a de- formed object based on the Talbot effect is proposed. For the test, we use a computer-controlled liquid crystal spatial light modulator （LC-SLM） and the computer-generated Talbot array hologram. A Talbot array hologram is generated and displayed on the LC-SLM screen, and the diffracted intensity is captured by a CCD camera. The information about the displacement is codified in the intensity pattern. The dis- placement can be obtained by the digital speckle correlation measurement （DSCM）. This method is sim- ple and easy, and can be used as an alternative method to measure displacement. Experimental results demonstrate the efficacy of the proposed method for the in-plane displacement measurement.

关 键 词：光学测量 泰伯效应 面内位移 数字散斑相关 

分 类 号：O436.1[机械工程—光学工程]