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Phase errors due to speckles in laser fringe projection
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2010 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 49, no 11, p. 2047-2053Article in journal (Refereed) Published
Abstract [en]

When measuring a three-dimensional shape with triangulation and projected interference fringes it is of interest to reduce speckle contrast without destroying the coherence of the projected light. A moving aperture is used to suppress the speckles and thereby reduce the phase error in the fringe image. It is shown that the phase error depends linearly on the ratio between the speckle contrast and the modulation of the fringes. In this investigation the spatial carrier method was used to extract the phase, where the phase error also depends on filtering the Fourier spectrum. An analytical expression for the phase error is derived. Both the speckle reduction and the theoretical expressions for the phase error are verified by simulations and experiments. It was concluded that a movement of the aperture by three aperture diameters during exposure of the image reduces the speckle contrast and hence the phase error by 60%. In the experiments, a phase error of 0.2 rad was obtained.

Place, publisher, year, edition, pages
2010. Vol. 49, no 11, p. 2047-2053
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-4951DOI: 10.1364/AO.49.002047ISI: 000276612200007PubMedID: 20390003Local ID: 2f52d150-3d57-11df-a0f4-000ea68e967bOAI: oai:DiVA.org:ltu-4951DiVA, id: diva2:977825
Note
Validerad; 2010; 20100401 (sarros)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Rosendahl, SaraHällstig, EmilGren, PerSjödahl, Mikael

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