7 March 2006 Optical processing of interference patterns
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For the first time the possibility for parallel optical processing and recognition of interference patterns is shown. Sixty-four separated channels with multi-exposured holographic and low-cut filters are used The input interference patterns are calculated by finite element approach for penny-shaped crack in isotropic materials, surface defects and fault in laminate composite material. The set-up of an optical correlator for holographic recording of the filters and parallel processing of interference patterns is shown on Fig.l. High-resolution silver halide light sensitive material HP-650, made by the Bulgarian Academy of Sciences with different developers is used for holographic recording, creation of multiplicator and low-cut filters. Nine exposed holographic recordings were made for three different angles of rotation (-15 deg, 0, and +15 deg) and three different scales (-15%, 0, and +15%) of the interference patterns. Scale, shift and rotation invariant filtering has been obtained for a large angle of rotation of the input images The computer simulation, using a linear model of the system, is in good agreement with the experimental results. The differences could be explained by the nonlinearity of the multiexposure holographic recording For further development of the system and creation of the common filters for parallel optical processing of real two-dimensional interferometric data, a liquid crystal page composer and dynamic holographic recording in photorefractive materials are planed to be used.
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Ventseslav Christov Sainov, Nikola Metchkarov, Valentin A. Kostov, Wolfgang Osten, "Optical processing of interference patterns", Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); doi: 10.1117/12.498421; https://doi.org/10.1117/12.498421

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