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Fast and robust aut...
Fast and robust automatic calibration for single-shot dual-wavelength digital holography based on speckle displacements
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- Khodadad, Davood, 1985- (författare)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik,Luleå University of Technology
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- Bergström, Per (författare)
- Luleå tekniska universitet,Matematiska vetenskaper,Luleå University of Technology
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- Hällstig, Emil (författare)
- Optronic Partner dp AB, Box 733, SE-931 27 Skellefteå, Sweden
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- Sjödahl, Mikael (författare)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik,Luleå University of Technology
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(creator_code:org_t)
- Optical Society of America, 2015
- 2015
- Engelska.
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Ingår i: Applied Optics. - : Optical Society of America. - 1559-128X .- 2155-3165 .- 0003-6935 .- 1539-4522. ; 54:16, s. 5003-5010
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Annan maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Other Mechanical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk bildbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Image Processing (hsv//eng)
Nyckelord
- Speckle imaging
- Surface measurements
- figure
- Calibration
- Digital holography
- Speckle interferometry
- metrology
- Digital holographic imaging
- Holographic recording
- Optical fields
- Phase unwrapping
- Spatial frequency
- Speckle patterns
- Experimentell mekanik
- Scientific Computing
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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