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Shape reconstruction using dual wavelength digital holography and speckle movements
Luleå University of Technology. (Waves and Signals)
Optronic Partner dp AB.
Luleå University of Technology.
2013 (English)In: Proc. SPIE 8788: Optical Measurement Systems for Industrial Inspection VIII / [ed] Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi, SPIE - International Society for Optical Engineering, 2013, 87880IConference paper, Published paper (Refereed)
Abstract [en]

A new technique to measure depth based on dual wavelength digital holography and image correlation of speckle movements is demonstrated. By numerical refocusing of the complex optical field to different focus planes and by measuring the speckle movements caused by a wavelength shift both the object surface position and its local slope can be determined. It is shown how the speckle movement varies linearly with the surface slope, the wavelength shift and the distance of the numerical propagation. This gives a possibility to measure the slope with approximately the same precision as from the interferometric phase maps. In addition, when the object surface is in focus there is no speckle movement so by estimating in what plane the speckle movement is zero the absolute surface position can be measured. 

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2013. 87880I
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:lnu:diva-55621DOI: 10.1117/12.2020471ISBN: 9780819496041 (print)OAI: oai:DiVA.org:lnu-55621DiVA: diva2:953648
Conference
SPIE Optical Metrology 2013
Available from: 2016-08-18 Created: 2016-08-18 Last updated: 2016-11-24Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1117/12.2020471

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Khodadad, Davood
Atom and Molecular Physics and Optics

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CiteExportLink to record
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