Change search
ReferencesLink to record
Permanent link

Direct link
Characterization and compensation of decorrelations in interferometric set-ups using active optics
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2007 (English)In: Optical Measurement Systems for Industrial Inspection V / [ed] Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2007, 661619- p.Conference paper (Refereed)
Abstract [en]

Decorrelation in an interferometric set-up appears due to movements of the speckle pattern. In the case of rigid body movements the effect of decorrelation severely limits the performance of speckle interferometers. If the movement is larger than the speckle size the wanted phase information of the deformation is lost. Phase modulating spatial light modulators (SLMs) provide a new method to non-mechanically deflect and shape light. By using the SLM for scanning the field-of-view and focusing at different distances it is possible to measure intensity speckle patterns in a three-dimensional volume. These intensity images can then be cross correlated to give a three-dimensional correlation coefficient of the speckle pattern. If an SLM is utilized in an interferometric set-up it is possible to compensate for unwanted movements during an experiment. The measured correlation coefficient will then provide information regarding how large movements that are allowed with maintained performance of the interferometer. It is shown that for large movements the SLM can be used to retrieve phase maps.

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2007. 661619- p.
Series
, Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 6616
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-35236DOI: 10.1117/12.726054Local ID: 9b010410-79a6-11dd-b356-000ea68e967bISBN: 978-0819467584OAI: oai:DiVA.org:ltu-35236DiVA: diva2:1008488
Conference
Optical Measurement Systems for Industrial Inspection : 18/07/2007 - 18/07/2007
Note
Validerad; 2007; 20080903 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Hällstig, EmilSvanbro, Angelica
By organisation
Fluid and Experimental Mechanics

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 4 hits
ReferencesLink to record
Permanent link

Direct link