Extraction of phase field from a single contoured correlation fringe pattern of ESPI
Optics Express, Vol. 12, Issue 1, pp. 75-83 (2004)
http://dx.doi.org/10.1364/OPEX.12.000075
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Abstract
Speckle fringe patterns of ESPI are full of high-level speckle noise and normally are processed by phase shifting methods that require multi speckle fringe patterns. We propose a novel method to generate a speckle-noise-free fringe pattern from a single speckle fringe pattern and to extract the phase field from the new pattern. With the new method, the correlation between two speckle patterns is performed only within contour windows instead of rectangular windows and this contoured correlation results in a smooth, normalized fringe pattern without speckle noise. The new ESPI fringe patterns are speckle-noise-free and of comparable quality to that of moiré and hologram, which is unimaginable with traditional ESPI methods. In addition to the smoothness, the resultant fringe pattern is normalized automatically so that the full phase field can be extracted from this single fringe pattern by the single-image phase-shifting method.
© 2004 Optical Society of America
OCIS Codes
(100.2650) Image processing : Fringe analysis
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
ToC Category:
Research Papers
History
Original Manuscript: November 13, 2003
Revised Manuscript: December 19, 2003
Published: January 12, 2004
Citation
Qifeng Yu, Sihua Fu, Xia Yang, Xiangyi Sun, and Xiaolin Liu, "Extraction of phase field from a single contoured correlation fringe pattern of ESPI," Opt. Express 12, 75-83 (2004)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-1-75
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References
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