基于泰伯效应的面内位移测量

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-plane displacement measurement using talbot effect

In order to measure the in-plane displacement,a scheme to measure the displac ement of a deformed object based on the Talbot effect is proposed.For the test,w e 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 C CD camera.The information about the displacement is codified in the intensity pattern.The displacement can be obtai ned by the digital speckle correlation measurement (DSCM).This method is simple and easy,and can be used as an alternat ive method to measure displacement.Experimental results demonstrate the efficacy of the proposed meth od for the in-plane displacement measurement.