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《Acta Photonica Sinica》 2017-07
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Demodulation of Phase Shift Shadow MoiréFringe Pattern by Orthonormalzing Method

DU Hu-bing;YAN Jing-jing;School of Mechatronic Engineering,Xi′an Technological University;  
A self-calibration three-dimensional object surface measurement method with three image frames based on Gram-Schmidt orthonormalization method was proposed.The phase shift fringe map was obtained by translation grating,and the fringe background was eliminated by subtracting phase shift fringe maps with different frames. Then a phase demodulation method using Gram-Schmidt orthonormalization method and the least-square method was developed,so that the measurement phase can be extracted.Taking five steps Harlharan algorithm as a reference,the object surface was measured by different algorithms.The results show that compared with three steps phase shift algorithm and principal component analysis algorithm,the proposed method is more precise with phase error less than0.5rad and simplifies the mensuration.
【Key Words】: Optical devices Measurement Shadow Moiré Phase shifting algorithm Phase
【Fund】: 国家自然科学基金(Nos.61471288 51475351);; 陕西省自然科学重大基础研究项目(No.2016ZDJC-10)资助~~
【CateGory Index】: TP391.41
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