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Measurement of shape by using projected random patterns and temporal digital speckle photography
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
Luleå tekniska universitet.
1999 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 38, no 10, p. 1990-1997Article in journal (Refereed) Published
Abstract [en]

Projected random patterns have been used to measure the shape of discontinuous objects. A sequence of independent random patterns are projected onto the object. These images are analyzed by use of the technique called temporal digital speckle photography (DSP) that is introduced here. With temporal DSP the spatial resolution of the shape measurement is improved considerably compared with previously reported results with projected random patterns. A calibration procedure is described that uses a sequence of independent random patterns to calibrate measurement volume. As a result, independent space coordinates for each subimage are obtained. The accuracy is of the order of 1/1000 of the field of view where a subimage size of 8 pixels seems to be a good compromise between reliability and spatial resolution. The technique is illustrated with a measurement of an electrical plug and a 9-V battery

Place, publisher, year, edition, pages
1999. Vol. 38, no 10, p. 1990-1997
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-7577DOI: 10.1364/AO.38.001910Local ID: 5f6110e0-bb56-11db-b560-000ea68e967bOAI: oai:DiVA.org:ltu-7577DiVA, id: diva2:980467
Note
Godkänd; 1999; 20061122 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Sjödahl, Mikael

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