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Fast and robust automatic calibration for single-shot dual-wavelength digital holography based on speckle displacements
Luleå University of Technology.
Luleå University of Technology.
Optronic Partner dp AB.
Luleå University of Technology.
2015 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 54, no 16, p. 5003-5010Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to describe a fast and robust automatic single-shot dual-wavelength holographic calibration method that can be used for online shape measurement applications. We present a model of the correction in two terms for each lobe, one to compensate the systematic errors caused by off-axis angles and the other for the curvature of the reference waves, respectively. Each hologram is calibrated independently without a need for an iterative procedure or information of the experimental set-up. The calibration parameters are extracted directly from speckle displacements between different reconstruction planes. The parameters can be defined as any fraction of a pixel to avoid the effect of quantization. Using the speckle displacements, problems associated with phase wrapping is avoided. The procedure is shown to give a shape accuracy of 34 μm using a synthetic wavelength of 1.1 mm for a measurement on a cylindrical test object with a trace over a field of view of 18  mm×18  mm.

Place, publisher, year, edition, pages
2015. Vol. 54, no 16, p. 5003-5010
National Category
Medical Image Processing
Identifiers
URN: urn:nbn:se:lnu:diva-55804DOI: 10.1364/AO.54.005003OAI: oai:DiVA.org:lnu-55804DiVA, id: diva2:956013
Available from: 2016-08-29 Created: 2016-08-29 Last updated: 2017-11-21Bibliographically approved

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Khodadad, Davood

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  • Other locale
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  • asciidoc
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