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Title: Two-step dc-term-suppressed phase shifting technique in DSPI
Authors: Bhaduri, B. 
Tay, C.J. 
Quan, C. 
Keywords: Image processing
Phase shifting
Speckle interferometry
Window fourier transform
Issue Date: 2010
Citation: Bhaduri, B., Tay, C.J., Quan, C. (2010). Two-step dc-term-suppressed phase shifting technique in DSPI. Proceedings of SPIE - The International Society for Optical Engineering 7522 : -. ScholarBank@NUS Repository.
Abstract: Digital speckle pattern interferometry (DSPI) is a tool for making qualitative as well as quantitative measurements of deformation of objects. Temporal and spatial phase shifting techniques have been introduced in DSPI for extracting quantitative deformation data from the system. Temporal phase-shifting technique requires at least three phase shifted intensity patterns for phase measurement. On the other hand, spatial phase shifting technique though require single frame before and after the object deformation, gives low spatial resolution result. In this paper we propose a temporal phase shifting technique that uses only two phase shifted speckle patterns before and after the object deformation by suppressing the dc-term from the intensity pattern either by an averaging technique in spatial domain or low-pass filter operation in the frequency domain. Both the simulation and experimental results are presented to validate the effectiveness of the proposed technique. © 2010 SPIE.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
ISBN: 9780819479129
ISSN: 0277786X
DOI: 10.1117/12.848923
Appears in Collections:Staff Publications

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