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Title: Phase retrieval in ESPI from a dense phase fringe pattern
Authors: Niu, H.
Quan, C. 
Tay, C.J. 
Keywords: dense phase fringe
Phase retrieval
phase-shifting method
windowed Fourier transform
Issue Date: 2010
Citation: Niu, H., Quan, C., Tay, C.J. (2010). Phase retrieval in ESPI from a dense phase fringe pattern. Proceedings of SPIE - The International Society for Optical Engineering 7718 : -. ScholarBank@NUS Repository.
Abstract: A method for phase retrieval from dense phase fringe in phase-shifting electronic speckle pattern interferometry (ESPI) using fast windowed Fourier filtering (FWFF) method is presented. Phase-shifting method is an accurate method in ESPI for phase retrieval. However, the wrapped phase map is corrupted by the speckle noise which will significantly affect the phase unwrapping technique to acquire the accurately unwrapped phase map. For relatively large deformation measurement, the wrapped phase map becomes dense and hence becomes difficult to be demodulated properly. Conventional sine-cosine average filtering technique is difficult to reduce the noise in such case. FWFF algorithm is useful for noise reduction of wrapped phase maps. In this paper we propose to measure relatively large deformation by reducing noise using FWFF. Both the simulation and experimental results are presented to show that the proposed method can efficiently reduce the noise of the dense wrapped phase map and the deformation can be obtained using phase unwrapping technique. Further, the effect of speckle size on the results is also discussed. © 2010 Copyright SPIE - The International Society for Optical Engineering.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
ISBN: 9780819481917
ISSN: 0277786X
DOI: 10.1117/12.853775
Appears in Collections:Staff Publications

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