Title :
Tunable Micro Cat's Eye Array in an Optical Identification System and Comparison of Different ID Tags
Author :
Chih-Chieh Chang ; Yu-Cheng Yang ; Ming-Chun Su ; Jui-che Tsai
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
An optical identification (ID) system has been built, and dynamic ID tags are compared, which include a home-made tunable cat´s eye retroreflector array, a liquid crystal (LC) spatial light modulator (SLM) combined with a retroreflective tape, a LC SLM combined with a plane mirror, and a LC SLM combined with normal white paper. Performance comparisons indicate that the tag implemented with the microtunable cat´s eye retroreflector array offers the best system security. The image produced by the ID tag is also accurately recognized by the identification system.
Keywords :
identification; liquid crystal devices; mirrors; optical arrays; optical tuning; retroreflectors; security; spatial light modulators; ID tags; LC SLM; SLM; liquid crystal spatial light modulator; microcat eye array tuning; optical identification system; plane mirror; retroreflector array; Arrays; Glass; Optical character recognition software; Optical filters; Optical imaging; Optical scattering; Security; Cat’s eye; Cat???s eye; optical ID tag; optical character recognition (OCR); optical character recognition (OCR).; optical identification; retroreflector array;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2381513
