Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.optlastec.2009.05.014
Title: An improved windowed Fourier transform for fringe demodulation
Authors: Quan, C. 
Niu, H.
Tay, C.J. 
Keywords: Fringe demodulation
Phase measurement
Windowed Fourier transform (WFT)
Issue Date: Feb-2010
Source: Quan, C., Niu, H., Tay, C.J. (2010-02). An improved windowed Fourier transform for fringe demodulation. Optics and Laser Technology 42 (1) : 126-131. ScholarBank@NUS Repository. https://doi.org/10.1016/j.optlastec.2009.05.014
Abstract: 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. © 2009 Elsevier Ltd. All rights reserved.
Source Title: Optics and Laser Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/59476
ISSN: 00303992
DOI: 10.1016/j.optlastec.2009.05.014
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