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Proceedings Paper

Photorefractive moiré like pattern as optical numerical code generator
Author(s): G. N. de Oliveira; M. E. de Oliveira; P. A. M. dos Santos
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Paper Abstract

In the present letter 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.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8493, Interferometry XVI: Techniques and Analysis, 84931F (13 September 2012); doi: 10.1117/12.931660
Show Author Affiliations
G. N. de Oliveira, Univ. Federal Fluminense (Brazil)
M. E. de Oliveira, Univ. Federal Fluminense (Brazil)
P. A. M. dos Santos, Univ. Federal Fluminense (Brazil)

Published in SPIE Proceedings Vol. 8493:
Interferometry XVI: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers; Jan Burke, Editor(s)

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