Single fringe pattern demodulation using local adaptable quadrature filters

J. C. Estrada; M. Servin

doi:10.1117/12.726227

18 June 2007 Single fringe pattern demodulation using local adaptable quadrature filters

J. C. Estrada, M. Servin

Proceedings Volume 6617, Modeling Aspects in Optical Metrology; 66170R (2007) https://doi.org/10.1117/12.726227
Event: Optical Metrology, 2007, Munich, Germany

Abstract

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 these have never being used to demodulate complete image interferogramas with out carrirer (with closed fringes). The idea, in this paper, is to demodulate the fringe pattern 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.

Citation Download Citation

J. C. Estrada and M. Servin "Single fringe pattern demodulation using local adaptable quadrature filters", Proc. SPIE 6617, Modeling Aspects in Optical Metrology, 66170R (18 June 2007); https://doi.org/10.1117/12.726227

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KEYWORDS

Fringe analysis

Demodulation

Modulation

Bandpass filters

Linear filtering

Image filtering

Phase shift keying

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