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Complex amplitude correlation for compensation of large in-plane motion in digital speckle pattern interferometry
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2006 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 45, no 34, p. 8641-8647Article in journal (Refereed) Published
Abstract [en]

The use of complex amplitude correlation to compensate for large in-plane motion in digital speckle pattern interferometry is investigated. The result is compared with experiments where digital speckle photography (DSP) is used for compensation. An advantage of using complex amplitude correlation instead of intensity correlation (as in DSP) is that the phase change describing the deformation is retrieved directly from the correlation peak, and there is no need to compensate for the large movement and then use the interferometric algorithms. A discovered drawback of this method is that the correlation values drop quickly if a phase gradient larger than π is present in the subimages used for cross correlation. This means that, for the complex amplitude correlation to be used, the size of the subimages must be well chosen or a third parämeter in the cross-correlation algorithm that compensates for the phase variation is needed. Correlation values and wrapped phase maps from the two techniques (intensity and complex amplitude correlation) are presented.

Place, publisher, year, edition, pages
2006. Vol. 45, no 34, p. 8641-8647
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-14090DOI: 10.1364/AO.45.008641ISI: 000242473800009Scopus ID: 2-s2.0-33846486807Local ID: d688e350-aef8-11dc-8c11-000ea68e967bOAI: oai:DiVA.org:ltu-14090DiVA, id: diva2:987044
Note
Validerad; 2006; 20071220 (mike)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Svanbro, AngelicaSjödahl, Mikael

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