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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 2 — Jan. 18, 2010
  • pp: 560–565

Strain estimation in digital holographic interferometry using piecewise polynomial phase approximation based method

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

Optics Express, Vol. 18, Issue 2, pp. 560-565 (2010)

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Measurement of strain is an important application of digital holographic interferometry. As strain relates to the displacement derivative, it depends on the derivative of the interference phase corresponding to the reconstructed interference field. The paper proposes an elegant method for direct measurement of unwrapped phase derivative. The proposed method relies on approximating the interference phase as a piecewise cubic polynomial and subsequently evaluating the polynomial coefficients using cubic phase function algorithm. The phase derivative is constructed using the evaluated polynomial coefficients. The method’s performance is demonstrated using simulation and experimental results.

© 2010 Optical Society of America

OCIS Codes
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(090.1995) Holography : Digital holography

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 23, 2009
Revised Manuscript: December 11, 2009
Manuscript Accepted: December 11, 2009
Published: January 4, 2010

Sai S. Gorthi, G. Rajshekhar, and Pramod Rastogi, "Strain estimation in digital holographic interferometry using piecewise polynomial phase approximation based method," Opt. Express 18, 560-565 (2010)

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