Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method

Igor P. Gurov; Petr Hlubina; Vladimir Chugunov

doi:10.1117/12.464466

1 April 2002 Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method

Igor P. Gurov, Petr Hlubina, Vladimir Chugunov

Proceedings Volume 4750, ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage; (2002) https://doi.org/10.1117/12.464466
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus

Abstract

Spectral modulated interference fringes are observed in the form of the periodical modulation of broadband spectrum at the output of interferometer provided with a subsequent spectrometer. Group optical path difference of interfering light waves corresponding to the distance from the surface to be measured is characterized by the phase function or fringe frequency of the spectral modulated interferogram. The phase locked loop (PLL) method was used to demodulate spectral fringes. It is supposed a priori unknown carrier fringe frequency, and PLL technique is realized in iterative mode to calculate full fringe phase. At the first iteration step the fringe phase equal to zero is supposed. The second iteration takes the demodulated phase found form the first iteration, etc. As a result, the phase function of the spectral fringes is found. Method was verified experimentally with application to the analysis of the spectral modulated interferograms inherent in Michelson interferometer excited by a low-coherent source.

Citation Download Citation

Igor P. Gurov, Petr Hlubina, and Vladimir Chugunov "Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method", Proc. SPIE 4750, ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage, (1 April 2002); https://doi.org/10.1117/12.464466

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