An electronic identification method and means.

摘要

An electronic identification system comprising an identification unit (10) and an interrogator unit. The interrogator unit includes means (11) for emitting light pulses und receiver means (51) to receive a coded signal from the identification unit (10). The interrogator also includes signal verification means (52) to verify that the coded signal from the identification unit (10) has been correctly received. The identification unit (10) includes pulsed light detector means (11), signal processing means (13) to convert the signal into clock pulses and storage means (14) for storing an identifying code such that the code is synchronized out of the storage means (14) by the clock pulses. The identification unit (10) also includes transmitter means (16) for transmitting a coded signal to the receiver means (51), interrogator signal verification means (R10, C10 and 40) to verify the receipt of correct interrogation pulses and shut-down means (37, 41 and 42) to shut-down the identification unit (10) once a verified interrogate signal ceases to be received by the identification unit.