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Temporal phase unwrapping: application to surface profiling of discontinuous objects
Luleå tekniska universitet.
1997 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 36, no 13, p. 2770-2775Article in journal (Refereed) Published
Abstract [en]

The recently proposed technique of temporal phase unwrapping has been used to analyze the phase maps from a projected-fringe phase-shifting surface profilometer. A sequence of maps is acquired while the fringe pitch is changed; the phase at each pixel is then unwrapped over time independently of the other pixels in the image to provide an absolute measure of surface height. The main advantage is that objects containing height discontinuities are profiled as easily as smooth ones. This contrasts with the conventional spatial phase-unwrapping approach for which the phase jump across a height discontinuity is indeterminate to an integral multiple of 2 . The error in height is shown to decrease inversely with the number of phase maps used.

Place, publisher, year, edition, pages
1997. Vol. 36, no 13, p. 2770-2775
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-2949DOI: 10.1364/AO.36.002770ISI: A1997WX24200004Scopus ID: 2-s2.0-0031143877Local ID: 0b0f5510-0183-11dc-ad0a-000ea68e967bOAI: oai:DiVA.org:ltu-2949DiVA, id: diva2:975803
Note
Godkänd; 1997; 20070513 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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