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Simultaneous measurement of out-of-plane displacement and slope using a multiaperture DSPI system and fast Fourier transform
Mahendra Prasad Kothiyal
Published in OSA - The Optical Society
2007
Volume: 46
   
Issue: 23
Pages: 5680 - 5686
Abstract
The simultaneous quantitative measurement of out-of-plane displacement and slope using the fast Fourier transform method with a single three-aperture digital speckle pattern interferometry (DSPI) arrangement is demonstrated. The method coherently combines two sheared object waves with a smooth reference wave at the CCD placed at the image plane of an imaging lens with a three-aperture mask placed in front of it. The apertures also introduce multiple spatial carrier fringes within the speckle. A fast Fourier transform of the image generates seven distinct diffraction halos in the spectrum. By selecting the appropriate halos, one can directly obtain two independent out-of-plane displacement phase maps and a slope phase map from the two speckle images, one before and the second after loading the object. It is also demonstrated that by subtracting the out-of-plane displacement phase maps one can generate the same slope phase map. Experimental results are presented for a circular diaphragm clamped along the edges and loaded at the center. © 2007 Optical Society of America.
About the journal
JournalData powered by TypesetApplied Optics
PublisherData powered by TypesetOSA - The Optical Society
ISSN1559128X
Impact Factor1.230
Open AccessNo
Citation Styleunsrt
Sherpa RoMEO Archiving PolicyGreen
Concepts (11)
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    Charge coupled devices
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    Diffraction patterns
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    Fast fourier transforms
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    Interferometry
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    Pattern matching
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    Shear waves
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    CARRIER FRINGES
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    DIFFRACTION HALOS
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    DIGITAL SPECKLE PATTERN INTERFEROMETRY (DSPI) ARRANGEMENT
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    OUT-OF-PLANE DISPLACEMENT
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    Speckle