Applications of piezoelectric technology in retro-identification system

 

Piezoelectric technology has been wildly used in nondestructive examination technology; especially it also can be used in acousto-optic retro-identification technology. Theoretical analysis and experimental research of a piezoelectric cat's eye retro-identification (PCERI) system have been carried out. Firstly, an equivalent mathematical model of the cat's eye modulating retro-reflector (MRR) was set up, then the influence of the optical indexes to the reflected intensity was calculated, including the distance between the interrogator and the MRR, the focal length of the lens and the detector diameter. Secondly, a PCERI system has been built up, by which the transmission and identification of simple information have been achieved by experiment. The information transmission speed of PCERI is 600bit/s, which can meet the requirements of identification.