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Stereoscopic digital speckle photography system for 3-D displacement field measurements
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
1999 (English)In: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 31, no 6, p. 425-443Article in journal (Refereed) Published
Abstract [en]

Stereoscopic digital speckle photography offers a technique to measure object shapes and 3-D displacement fields in experimental mechanics. The system measures the displacement of a random white light speckle pattern, which somehow is present on the object surface, using digital correlation. This paper describes a general physical model for stereo imaging systems. A camera calibration algorithm, which takes the distortion in the lenses into account, is also presented and evaluated by real experiments. Standard deviations of small deformations as low as 1% of the pixel size for in-plane deformations and 6% of the pixel size for the out-of-plane component are reported. Using the calibration algorithm described, the main source of errors is random errors originating from the correlation algorithm.

Place, publisher, year, edition, pages
1999. Vol. 31, no 6, p. 425-443
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-4431DOI: 10.1016/S0143-8166(99)00040-8ISI: 000084262400003Local ID: 2604cfc0-bb57-11db-b560-000ea68e967bOAI: oai:DiVA.org:ltu-4431DiVA, id: diva2:977304
Note
Godkänd; 1999; 20061122 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sjödahl, Mikael

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