Surface contouring by phase-shifting real-time holography using photorefractive sillenite crystals |
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Authors: | MRR Gesualdi D Soga M Muramatsu |
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Institution: | aInstituto de Fisica, Universidade de São Paulo, CP 66318, CEP 05315-970, São Paulo, SP, Brazil |
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Abstract: | This work proposes to obtain surface contouring by phase-shifting real-time holography using photorefractive sillenite crystals which provides the surface contouring from a change in phase of wavefront of the object illumination beam. The real-time holography using the photorefractive Bi12SiO20 crystal and the four-frame phase-shifting technique was used to obtain the phase map, this map was filtered by an anisotropic sin/cos filter and the unwrapping process used was the cellular-automata technique. We obtained experimental results of the surfaces of the large objects with real discontinuities, and these results agree with the dimensions of the object. |
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Keywords: | Surface contouring Phase-shifting Real-time holography Photorefractive sillenite crystals |
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