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Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients
Luleå University of Technology.
Optronic Partner dp AB.
Luleå University of Technology.
2013 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 52, no 10, p. 101912-101912Article in journal (Refereed) Published
Abstract [en]

A new method to measure shape by analyzing the speckle movements in images generated by numerical propagation from dual-wavelength holograms is presented. The relationship of the speckle movements at different focal distances is formulated, and it is shown how this carries information about the surface position as well as the local slope of the object. It is experimentally verified that dual-wavelength holography and numerically generated speckle images can be used together with digital speckle correlation to retrieve the object shape. From a measurement on a cylindrical test object, the method is demonstrated to have a random error in the order of a few micrometers.

Place, publisher, year, edition, pages
2013. Vol. 52, no 10, p. 101912-101912
National Category
Atom and Molecular Physics and Optics
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-55622DOI: 10.1117/1.OE.52.10.101912OAI: oai:DiVA.org:lnu-55622DiVA, id: diva2:953653
Available from: 2016-08-18 Created: 2016-08-18 Last updated: 2017-11-28Bibliographically approved

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Khodadad, Davood

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