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Proceedings Paper

Phase retrieval from a single fringe pattern using Teager-Hilbert-Huang transform
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Paper Abstract

Phase retrieval techniques like phase-shifting method and Fourier-transform technique provides accurate phase distribution for static measurements. However, it is extremely difficult to use these techniques for dynamic measurement. In this paper, an automated fringe analysis technique to retrieve phase distribution from single fringe pattern is proposed. The proposed method uses Teager-Hilbert-Huang transform, which is based on empirical mode decomposition (EMD), vortex operator (VO) and Teager energy operator (TEO) for fringe demodulation. The proposed method is suitable for both static and dynamic measurements. In this method, a fringe pattern is normalized using EMD and VO generates a complex field of the signal. Finally TEO is used to obtain the phase and its phase derivatives map. Unlike traditional phase retrieval algorithms, this method provides unwrapped phase derivatives directly. Hence there is no need for a separate phase unwrapping process. The proposed method is validated using simulated fringe patterns and experimental data obtained from electronic speckle pattern interferometry (ESPI). The results show that this method determines the phase map and its derivatives from the single fringe pattern effectively.

Paper Details

Date Published: 4 March 2015
PDF: 6 pages
Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93020Q (4 March 2015); doi: 10.1117/12.2081237
Show Author Affiliations
Deepan Balakrishnan, National Univ of Singapore (Singapore)
C. Quan, National Univ. of Singapore (Singapore)
C. J. Tay, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 9302:
International Conference on Experimental Mechanics 2014
Chenggen Quan; Kemao Qian; Anand Asundi; Fook Siong Chau, Editor(s)

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