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Proceedings Paper

Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method
Author(s): Igor P. Gurov; Petr Hlubina; Vladimir Chugunov
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Paper 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.

Paper Details

Date Published: 1 April 2002
PDF: 8 pages
Proc. SPIE 4750, ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage, (1 April 2002); doi: 10.1117/12.464466
Show Author Affiliations
Igor P. Gurov, St. Petersburg Institute of Fine Mechanics and Optics (Russia)
Petr Hlubina, Silesian Univ. Opava (Czech Republic)
Vladimir Chugunov, St. Petersburg Institute of Fine Mechanics and Optics (Russia)


Published in SPIE Proceedings Vol. 4750:
ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage

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