Please use this identifier to cite or link to this item: https://doi.org/10.1117/12.850868
Title: A modified WFT for shape and deformation measurement
Authors: Niu, H.
Quan, C. 
Tay, C.J. 
Keywords: Dynamic nondestructive testing
Modified windowed Fourier transform
Phase retrieval
Issue Date: 2010
Source: Niu, H., Quan, C., Tay, C.J. (2010). A modified WFT for shape and deformation measurement. Proceedings of SPIE - The International Society for Optical Engineering 7522 : -. ScholarBank@NUS Repository. https://doi.org/10.1117/12.850868
Abstract: Time-frequency analysis is widely applied to the optical measurement for phase retrieval from fringe patterns. Windowed Fourier transform (WFT) is one of the time-frequency analysis methods and has recently received extensive study on phase retrieval from fringe patterns generated by the optical interferometry or structured light illumination. WFT has been applied for shape and deformation measurement in dynamic nondestructive testing. However, the computation time of WFT is longer than that of conventional Fourier transform method for fringe demodulation. This has restricted the WFT in the application for dynamic measurement. Therefore, a modified WFT is introduced to reduce the computation time. In this approach, the fast Fourier transform is implemented in the WFT algorithm to improve the computational efficiency and border effect of the proposed method for fringe analysis is discussed. The phase retrieval of the proposed method is simulated and the simulation results are compared with conventional Fourier transform method and convolution method of WFT in terms of noise reduction. The experimental work on shape and deformation measurement is conducted to verify the effectiveness and validity of the proposed method. © 2010 SPIE.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/73048
ISBN: 9780819479129
ISSN: 0277786X
DOI: 10.1117/12.850868
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