G - Physics – 01 – S
Patent
G - Physics
01
S
343/17, 343/19,
G01S 13/74 (2006.01) G08B 13/24 (2006.01)
Patent
CA 1117633
- 1 - Abstract: A presence sensing system comprises a transmitter (13, 14) for transmitting a scanning signal to an area to be kept under surveillance and an active receiver/transmitter device (20, 21, 22, 23, 24) the presence of which is to be detected in the surveillance area, The receiver (21) of the receiver/transmitter device being adapted to receive the scanning signal upon entry into the surveil- lance area and the transmitter (23) of the receiver/ transmitter device being arranged to transmit a presence signal in response to receipt of the scanning signal. receiver (17, 18) is provided for receiving the presence signal to indicate the presence of the receiver/transmitter device in the surveillance area. The invention also includes an active receiver/transmitter device (71, 72, 73, 74) having a securing arrangement (73, 74) for retaining the device on an article to be kept under surveillance. The invention also includes a detector for a security system having a generator (10, 11, 12, 15) for generating a signal for transmission and a transmitter (13, 14) for transmitting the transmission signal for receipt by a presence indicating security device. The detector also comprises a receiver (17, 18) for receiving a signal from the security device in response to the transmission frequency and a comparator (16) for comparing the received signal with a generated frequency for providing a verified presence indicating signal when there is a predetermined relationship therebetween.
319492
Falck John B.
Glanvill Keith B.
Reid John N.
Gowling Lafleur Henderson Llp
Tag Radionics Limited
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