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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 5 — Mar. 5, 2007
  • pp: 2288–2298

Local adaptable quadrature filters to demodulate single fringe patterns with closed fringes.

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

Optics Express, Vol. 15, Issue 5, pp. 2288-2298 (2007)

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We propose a new approach to demodulate a single fringe pattern with closed fringes by using Local Adaptable Quadrature Filters (LAQF). Quadrature filters have been widely used to demodulate complete image interferograms with carrier frequency. However, in this paper, we propose the use of quadrature filters locally, assuming that the phase is locally quasimonochromatic, since quadrature filters are not capable to demodulate image interferograms with closed fringes. The idea, in this paper, is to demodulate the fringe pattern with closed fringes sequentially, using a fringe following scanning strategy. In particular we use linear robust quadrature filters to obtain a fast and robust demodulation method for single fringe pattern images with closed fringes. The proposed LAQF method does not require a previous fringe pattern normalization. Some tests with experimental interferograms are shown to see the performance of the method along with comparisons to its closest competitor, which is the Regularized Phase Tracker (RPT), and we will see that this method is tolerant to higher levels of noise.

© 2007 Optical Society of America

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 29, 2006
Revised Manuscript: January 25, 2007
Manuscript Accepted: January 29, 2007
Published: March 5, 2007

J. C. Estrada, M. Servin, and J. L. Marroquín, "Local adaptable quadrature filters to demodulate single fringe patterns with closed fringes," Opt. Express 15, 2288-2298 (2007)

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