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Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2013 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 52, no 10, article id 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, article id 101912
Keywords [en]
digital holography, speckle movements, shape measurement, dual wavelength, phase gradients, Technology - Electrical engineering, electronics and photonics
Keywords [sv]
Teknikvetenskap - Elektroteknik, elektronik och fotonik
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-16110DOI: 10.1117/1.OE.52.10.101912ISI: 000328254600017Scopus ID: 2-s2.0-84886787525Local ID: fb060241-0d1c-469d-a1ab-a677c2bd2d18OAI: oai:DiVA.org:ltu-16110DiVA, id: diva2:989086
Note
Validerad; 2013; 20130916 (davkho)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Khodadad, DavoodHällstig, EmilSjödahl, Mikael

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