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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 24 — Dec. 2, 2013
  • pp: 29687–29694

Robust adaptive phase-shifting demodulation for testing moving wavefronts

Orlando Medina, Julio C. Estrada, and M. Servin  »View Author Affiliations

Optics Express, Vol. 21, Issue 24, pp. 29687-29694 (2013)

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Optical interferometers are very sensitive when environment perturbations affect its optical path. The wavefront under test is not static at all. In this paper, it is proposed a novel and robust phase-shifting demodulation method. This method estimates the interferogram’s phase-shifting locally, reducing detuning errors due to environment perturbations like vibrations and/or miscalibrations of the Phase-Shifting Interferometry setup. As we know, phase-shifting demodulation methods assume that the wavefront under test is static and there is a global phase-shifting for all pixels. The demodulation method presented here is based on local weighted least-squares, letting each pixel have its own phase-shifting. This is a different and better approach, considering that all previous works assume a global phase-shifting for all pixels of interferograms. Seeing this method like a black box, it receives an interferogram sequence of at least 3 interferograms and returns the modulating phase or wavefront under test. Here it is not necessary to know the phase shifts between the interferograms. It does not assume a global phase-shifting for the interferograms, is robust to the movements of the wavefront under test and tolerates miscalibrations of the optical setup.

© 2013 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Image Processing

Original Manuscript: October 1, 2013
Revised Manuscript: November 12, 2013
Manuscript Accepted: November 13, 2013
Published: November 22, 2013

Orlando Medina, Julio C. Estrada, and M. Servin, "Robust adaptive phase-shifting demodulation for testing moving wavefronts," Opt. Express 21, 29687-29694 (2013)

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