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Proceedings Paper

Verifying measuring accuracy of the fractional part of interference fringe order by interferometric signal autoconvolution method
Author(s): Igor P. Gurov; Olga B. Rufanova
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Paper Abstract

New method of determination of fractional part of interference fringe order is proposed and its accuracy is verified. This method is based on the calculation of the interferometric signal autoconvolution that is a version of the matched filtering method in the case the interferometric signal is an even function. The fractional part of interference order is identified by the position of the autoconvolution signal maximum. It is evaluated that measuring accuracy depends on the interference pattern parameters such as its spatial frequencies with reference to the fundamental frequency defined as an inverse value of the image extent. The high noise-immunity of the proposed method was proved experimentally: the fringe order error in typical cases was less than 0.03 when S/N ratio in interference pattern was 10. The errors of FFT algorithm were verified with reference to direct autoconvolution method.

Paper Details

Date Published: 27 December 1996
PDF: 6 pages
Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); doi: 10.1117/12.262608
Show Author Affiliations
Igor P. Gurov, St. Petersburg State Institute of Fine Mechanics and Optics (Russia)
Olga B. Rufanova, St. Petersburg State Institute of Fine Mechanics and Optics (Russia)


Published in SPIE Proceedings Vol. 2969:
Second International Conference on Optical Information Processing
Zhores I. Alferov; Yuri V. Gulyaev; Dennis R. Pape, Editor(s)

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