Dector system for access control, and a detector assembly for im

Details Dector system for access control, and a detector assembly for im Dector system for access control, and a detector assembly for im

1999-02-23

2000-03-14

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

3405729, 324224, G08B 1314

Patent

active

060378700

ABSTRACT:
The present invention provides a detector system for access control, the system comprising: transmitter coils; associated receiver coils; transponders suitable for generating identifiable signatures; and processor circuits adapted firstly to detect a weapon passing between the transmitter and receiver coils by analyzing variations in the signal received by the receiver coil, and secondly to detect the identifiable signature of a transponder on the basis of the signal received by the receiver coils; wherein: the transmitter coils are adapted to generate respective frequencies, firstly for exciting and detecting any weapons passing between the transmitter and receiver coils, and secondly for activating transponders; the transponders have means suitable for powering their internal circuits electrically from the signal received at the "activation" frequency; each weapon excitation and detection frequency is very different from each frequency used for activating transponders and for transponder signatures; and the signals used for detecting transponders are taken from the outputs of receiver coils that are also used for detecting weapons.

REFERENCES:
patent: 3891980 (1975-06-01), Lewis et al.
patent: 4821023 (1989-04-01), Parks
patent: 4866424 (1989-09-01), Parks

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