18 August 2014 Digital holographic moiré pattern for optical numerical code generation
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Abstract
In the present paper low frequency moiré fringe patterns are used as secure numerical code generator. These moiré patterns are experimentally obtained by the superposition of two sinusoidal gratings with slightly different pitches. The Bi12TiO20 photorefractive crystal sample is used as holographic medium An optical numerical base was defined with patterns representing 0,1 and -1 digits like bits. Then, the complete set of these optical bits are combined to form bytes, where a numerical sequence is represented. The results show that the proposed numerical code could be used as standard numerical identification in robotic vision or in transmition of security numerical keys.
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G. N. de Oliveira, G. N. de Oliveira, M. E. de Oliveira, M. E. de Oliveira, R. B. da Rocha Freire Jr., R. B. da Rocha Freire Jr., P. A. M. dos Santos, P. A. M. dos Santos, } "Digital holographic moiré pattern for optical numerical code generation", Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 920316 (18 August 2014); doi: 10.1117/12.2061714; https://doi.org/10.1117/12.2061714
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