Security system for monitoring the passage of items through...

Details Security system for monitoring the passage of items through... Security system for monitoring the passage of items through...

G - Physics

08

B

G08B 13/24 (2006.01) G08B 13/14 (2006.01)

Patent

CA 2255342

A security system for monitoring the presence of one or more objects in a monitored zone. The system comprising an antenna and at least one tag having a tuned resonant circuit, the tag being associated with one or more objects to be monitored. A transmitter coupled to the antenna operable to transmit at one of a plurality of frequencies in response to a frequency selection signal; a receiver coupled to said antenna and for producing a tag detection signal for stopping said cycling of said transmitter frequencies in response to a signal received at said receiver from said tag thereby causing said transmitter to transmit at a single frequency when a tag is detected. Means for decreasing the output power of the transmitter when the received signal is above a predetermined level.

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