Verifying measuring accuracy of the fractional part of interference fringe order by interferometric signal autoconvolution method

Igor P. Gurov; Olga B. Rufanova

doi:10.1117/12.262608

27 December 1996 Verifying measuring accuracy of the fractional part of interference fringe order by interferometric signal autoconvolution method

Igor P. Gurov, Olga B. Rufanova

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Proceedings Volume 2969, Second International Conference on Optical Information Processing; (1996) https://doi.org/10.1117/12.262608
Event: Second International Conference on Optical Information Processing, 1996, St. Petersburg, Russian Federation

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.

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Igor P. Gurov and Olga B. Rufanova "Verifying measuring accuracy of the fractional part of interference fringe order by interferometric signal autoconvolution method", Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); https://doi.org/10.1117/12.262608

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