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Error-reduction methods for shape measurement by temporal phase unwrapping
Luleå tekniska universitet.
1997 (English)In: Optical Society of America. Journal A: Optics, Image Science, and Vision, ISSN 1084-7529, E-ISSN 1520-8532, Vol. 14, no 12, p. 3188-3196Article in journal (Refereed) Published
Abstract [en]

Temporal phase unwrapping is a method of analyzing fringe patterns in which the fringe phase at each pixel is measured and unwrapped as a function of time t. We propose two methods for improving the signal-to-noise ratio of the total phase change by incorporating data from the intermediate phase values. The first involves fitting the expected curve to the measured phase history; the second involves Fourier transformation of the corresponding phasors. The performance of these methods is compared both experimentally, with data from a fringe projector based on a spatial-light modulator, and numerically. It is shown that the optimum performance is given by the Fourier transform method. The best way to use the first method is with decreasing exponentially with time from its maximum value to zero; this provides significant improvements in reliability, accuracy, and computation time compared with the original temporal unwrapping algorithm

Place, publisher, year, edition, pages
1997. Vol. 14, no 12, p. 3188-3196
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-7481Local ID: 5e0ce060-02c4-11dc-ad0a-000ea68e967bOAI: oai:DiVA.org:ltu-7481DiVA: diva2:980371
Note
Godkänd; 1997; 20070515 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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http://www.opticsinfobase.org/abstract.cfm?URI=josaa-14-12-3188
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Optical Society of America. Journal A: Optics, Image Science, and Vision
Applied Mechanics

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  • Other locale
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