Real-time analog holography and pattern recognition

✍ Scribed by Amy S. Kransteuber; Don A. Gregory

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 363 KB
• Volume: 30
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.1208

✦ Synopsis

Abstract

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.