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Proceedings Paper

Dynamic processing of spectral interference fringes based on the stochastic phase locked loop method
Author(s): Igor P. Gurov; Vladimir Chugunov
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Paper Abstract

Interferometric optical radar techniques are widely used in non-contact testing and production control. Interferometric spectral radar includes an unbalanced low-coherent interferometer with a subsequent sepctrometer that provides the channeled spectrum observation in the form of spectral modulated fringes inside the light source spectral band. We propose to use the stochastic phase locked loop (SPLL) method for processing the spectral fringe obtained with the measuring wave interaction with a partially scattering tissues. This method involves the dynamic description of the stochastic signals by the discrete stochastic differential equations. Stochastic dynamic fringe processing is based on the prediction the signal value at a next discretization step using whole statistical information available before this step. The prediction error is calculated as the difference between observed and predicted values. Optimal SPLL method provides the minimum RMS error of stochastic fringe phase estimation. Recurrence SPLL procedure increases the quickness of calculations and allows creating the compact measuring devices for industrial inspection.

Paper Details

Date Published: 26 September 2003
PDF: 10 pages
Proc. SPIE 5134, Current Research on Holography and Interferometric Methods for Measurement of Object Properties: 2000-2002, (26 September 2003); doi: 10.1117/12.518201
Show Author Affiliations
Igor P. Gurov, St. Petersburg Institute of Fine Mechanics and Optics (Russia)
Vladimir Chugunov, St. Petersburg Institute of Fine Mechanics and Optics (Russia)


Published in SPIE Proceedings Vol. 5134:
Current Research on Holography and Interferometric Methods for Measurement of Object Properties: 2000-2002
Yuri N. Zakharov, Editor(s)

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