Out-of-plane displacement measurement using optical vortex phase shifting

被引：0
|
作者：
Sun H.-B. [1 ,2 ]
Sun P. [1 ]
机构：
[1] School of Physics and Electronics, Shandong Normal University, Jinan
[2] College of Physics and Electronic Engineering, Taishan University, Tai'an, 271021, Shandong
来源：
Sun, Ping (sunpingmail@163.com) | 2016年 / Chinese Optical Society卷 / 45期
基金：
中国国家自然科学基金;
关键词：
Optical measurement; Optical vortex phase shifting; Out-of-plane displacement; Spatial light modulator;
D O I：
10.3788/gzxb20164511.1112001
中图分类号：
学科分类号：
摘要：
In order to realize the digital control of phase shifting in Electronic Speckle Pattern Interferometry (ESPI), a method for out-of-plane displacement measurement by applying phase shifting based on optical vortex was proposed. In the experiment, vortex beam is generated by a Reflective Liquid Crystal Spatial Light Modulator (LC-SLM), and the phase shifts are obtained by rotating the vortex beam around its axes. Vortex beam which is used as reference light interferes with object light, and the out optical field is captured by a CCD camera. Four speckle patterns with phase-step π/2 are captured by the CCD before and after the deformation, respectively. The phase difference of the deformed object is obtained by unwrapping. Experimental results demonstrate the efficacy of the proposed method for out-of-plane displacement measurement. © 2016, Science Press. All right reserved.
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页数：5
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