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Real‐time analog holography and pattern recognition
Author(s) -
Kransteuber Amy S.,
Gregory Don A.
Publication year - 2001
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.1208
Subject(s) - holography , optics , microwave , spatial light modulator , computer science , reference beam , object (grammar) , physics , artificial intelligence , telecommunications
The combination of a high‐resolution charge‐coupled device (CCD) camera and a phase‐modulating liquid‐crystal array allows holographic fringes to be detected and redisplayed in real time, replacing traditional recording techniques. A modified Mach–Zehnder (Leith–Upatnieks) architecture supplies the small object‐to‐reference beam angle necessary to produce fringes large enough to be processed accurately by the recording system. The optical system, developed to produce holograms and display holographic reconstructions in real time, is then slightly changed to become an optical pattern‐recognition architecture. The real‐time holography system and the optical correlator modifications are described in detail, and examples of experimental results are presented. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 20–24, 2001.