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Dual-wavelength holographic shape measurement with iterative phase unwrapping
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.ORCID iD: 0000-0002-7566-3656
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2011 (English)In: Optical Measurement Systems for Industrial Inspection VII / [ed] Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2011, p. 80820B-Conference paper, Published paper (Refereed)
Abstract [en]

In order to measure the shape of a large number of identical components in a manufacturing industry we propose a method where digital holography is used to capture an image of the object and then the shape of the object is achieved by using information from the CAD-model. The holographic recording of the object is done using dual wavelengths giving a synthetic wavelength of about 400 μm. This gives a phase map where the phase intervals represent a depth distance on the object of about 0.2 mm. To find the shape of the object the phase map has to be unwrapped. Since the surface contains discontinuities we use information from the CAD-model of the measured object and unwrap the phase iteratively. The result becomes a digital point representation of the measured surface that can either be used just as a description of the object shape or as a way to describe how well the object has been manufactured compared to the CAD-model. The measurement process that is proposed is adapted for on-line purposes; hence it is fast and reliable.

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2011. p. 80820B-
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 8082
National Category
Applied Mechanics Computational Mathematics
Research subject
Experimental Mechanics; Scientific Computing
Identifiers
URN: urn:nbn:se:ltu:diva-32846DOI: 10.1117/12.889424Scopus ID: 84861059715Local ID: 7771828a-1842-469d-815b-51c84b901bdfISBN: 9780819486783 (print)OAI: oai:DiVA.org:ltu-32846DiVA, id: diva2:1006080
Conference
Optical Measurement Systems for Industrial Inspection : 23/05/2011 - 26/05/2011
Note
Validerad; 2011; 20110816 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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