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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 34 — Dec. 1, 2011
  • pp: H16–H21

Simultaneous measurement of in-plane and out-of-plane displacement derivatives using dual-wavelength digital holographic interferometry

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

Applied Optics, Vol. 50, Issue 34, pp. H16-H21 (2011)

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The paper introduces a method for simultaneously measuring the in-plane and out-of-plane displacement derivatives of a deformed object in digital holographic interferometry. In the proposed method, lasers of different wavelengths are used to simultaneously illuminate the object along various directions such that a unique wavelength is used for a given direction. The holograms formed by multiple reference-object beam pairs of different wavelengths are recorded by a 3-color CCD camera with red, green, and blue channels. Each channel stores the hologram related to the corresponding wavelength and hence for the specific direction. The complex reconstructed interference field is obtained for each wavelength by numerical reconstruction and digital processing of the recorded holograms before and after deformation. Subsequently, the phase derivative is estimated for a given wavelength using two-dimensional pseudo Wigner-Ville distribution and the in-plane and out-of-plane components are obtained from the estimated phase derivatives using the sensitivity vectors of the optical configuration.

© 2011 Optical Society of America

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

ToC Category:

Original Manuscript: May 17, 2011
Revised Manuscript: July 12, 2011
Manuscript Accepted: July 26, 2011
Published: September 27, 2011

Virtual Issues
Digital Holography and 3D Imaging 2011 (2011) Applied Optics

Gannavarpu Rajshekhar, Sai Siva Gorthi, and Pramod Rastogi, "Simultaneous measurement of in-plane and out-of-plane displacement derivatives using dual-wavelength digital holographic interferometry," Appl. Opt. 50, H16-H21 (2011)

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