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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 4189–4197

Simultaneous multidimensional deformation measurements using digital holographic moiré

Gannavarpu Rajshekhar, Sai Siva Gorthi, and Pramod Rastogi  »View Author Affiliations


Applied Optics, Vol. 50, Issue 21, pp. 4189-4197 (2011)
http://dx.doi.org/10.1364/AO.50.004189


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Abstract

This paper proposes an elegant technique for the simultaneous measurement of in-plane and out-of-plane displacements of a deformed object in digital holographic interferometry. The measurement relies on simultaneously illuminating the object from multiple directions and using a single reference beam to interfere with the scattered object beams on the CCD plane. Numerical reconstruction provides the complex object wave-fields or complex amplitudes corresponding to prior and postdeformation states of the object. These complex amplitudes are used to generate the complex reconstructed interference field whose real part constitutes a moiré interference fringe pattern. Moiré fringes encode information about multiple phases which are extracted by introducing a spatial carrier in one of the object beams and subsequently using a Fourier transform operation. The information about the in-plane and out-of-plane displacements is then ascertained from the estimated multiple phases using sensitivity vectors of the optical configuration.

© 2011 Optical Society of America

OCIS Codes
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(090.1995) Holography : Digital holography

ToC Category:
Holography

History
Original Manuscript: April 19, 2011
Revised Manuscript: June 3, 2011
Manuscript Accepted: June 5, 2011
Published: July 19, 2011

Citation
Gannavarpu Rajshekhar, Sai Siva Gorthi, and Pramod Rastogi, "Simultaneous multidimensional deformation measurements using digital holographic moiré," Appl. Opt. 50, 4189-4197 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-21-4189

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