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Full-field 3D deformation measurement: Comparison between speckle phase and displacement evaluation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Institute of Applied Optics, University of Stuttgart.
Institute of Applied Optics, University of Stuttgart.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
Number of Authors: 4
2016 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, no 27, 7735-7743 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to describe a full-field deformation measurement method based on 3D speckle displacements. The deformation is evaluated from the slope of the speckle displacement function that connects the different reconstruction planes. For our experiment, a symmetrical arrangement with four illuminations parallel to the planes (x,z) and (y,z) was used. Four sets of speckle patterns were sequentially recorded by illuminating an object from the four directions, respectively. A single camera is used to record the holograms before and after deformations. Digital speckle photography is then used to calculate relative speckle displacements in each direction between two numerically propagated planes. The 3D speckle displacements vector is calculated as a combination of the speckle displacements from the holograms recorded in each illumination direction. Using the speckle displacements, problems associated with rigid body movements and phase wrapping are avoided. In our experiment, the procedure is shown to give the theoretical accuracy of 0.17 pixels yielding the accuracy of 2 × 10-3 in the measurement of deformation gradients

Place, publisher, year, edition, pages
2016. Vol. 55, no 27, 7735-7743 p.
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-59937DOI: 10.1364/AO.55.007735ISI: 000383996900038Scopus ID: 2-s2.0-8498881167OAI: oai:DiVA.org:ltu-59937DiVA: diva2:1039901
Note

Validerad; 2016; Nivå 2; 2016-10-25 (andbra)

Available from: 2016-10-25 Created: 2016-10-25 Last updated: 2017-01-19Bibliographically approved

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