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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 11 — May. 21, 2012
  • pp: 11734–11739

Synchronous phase-demodulation and harmonic rejection of 9-step pixelated dynamic interferograms

J. M. Padilla, M. Servin, and J. C. Estrada  »View Author Affiliations

Optics Express, Vol. 20, Issue 11, pp. 11734-11739 (2012)

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We propose a novel synchronous phase-demodulation of pixelated interferograms using squared 3x3 phase-shifted unit-cells. This 3x3 unit-cell is tiled over the CCD image sensor to create a two-dimensional (2D) pixelated carrier. Our synchronous phase-demodulation uses this 2D carrier to demodulate the pixelated interferogram as in the standard 2x2 unit-cell case. The main motivation behind the use of a 3x3 pixelated carrier (instead of the usual 2x2) is its higher harmonic robustness, allowing one to demodulate intensity-distorted fringe patterns. The harmonic rejection robustness of our spatial 3x3 configuration equals the robustness of the temporal least-squares 9-step phase-shifting algorithm (PSA). In other words, extending from the usual 2x2 phase-shifting unit-cell to 3x3 unit-cells, one extends the harmonic rejection of the demodulation algorithm. Finally we also prove that our proposed 9-step, 3x3 pixelated carrier uses the 2D available spectral space more efficiently than using these 9-steps in a linear spatial-carrier configuration.

© 2012 OSA

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 6, 2012
Revised Manuscript: April 23, 2012
Manuscript Accepted: April 30, 2012
Published: May 9, 2012

J. M. Padilla, M. Servin, and J. C. Estrada, "Synchronous phase-demodulation and harmonic rejection of 9-step pixelated dynamic interferograms," Opt. Express 20, 11734-11739 (2012)

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