An improved windowed Fourier transform for fringe demodulation

被引：25
|
作者：
Quan, C. [1 ]
Niu, H. [1 ]
Tay, C. J. [1 ]
机构：
[1] Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore
来源：
OPTICS AND LASER TECHNOLOGY | 2010年 / 42卷 / 01期
关键词：
Windowed Fourier transform (WFT); Fringe demodulation; Phase measurement; CONTINUOUS WAVELET TRANSFORM; 3-D SHAPE MEASUREMENT; PATTERN-ANALYSIS; CARRIER FRINGES; INTERFEROMETRY; EXTRACTION;
D O I：
10.1016/j.optlastec.2009.05.014
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A modified algorithm of windowed Fourier transform (WFT) for phase retrieval from electronic speckle-shearing fringe patterns with carriers is proposed. The algorithm is based on the introduction of a fast Fourier transform (FFT) in WFT to reduce computation time for fringe demodulation. Since boundary effects in FFT will influence the accuracy of phase retrieval, the Gerchberg method is employed to extrapolate the fringe pattern at the boundaries to reduce boundary effects. A theoretical analysis of the algorithm is presented. Both simulated and experimental results show that the proposed method has reduced the computation time significantly compared with the convolution method of WFT without sacrificing measurement accuracy. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：126 / 131
页数：6
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