G - Physics – 08 – B
Patent
G - Physics
08
B
349/30, 340/124.
G08B 13/02 (2006.01) G08B 25/00 (2006.01)
Patent
CA 1265597
ABSTRACT OF THE DISCLOSURE A surveillance installation to protect an area of ground. A number of sensing units are spaced around the perimeter of the area to be protected. Each sensing unit comprises a network of strands inconspicuously deployed over a portion of the ground and connected to a magnetically operated switch. When an intruder trips one of the strands, the magnetic switch is operated to signal the presence of an intruder. A central monitoring unit powered by a low voltage DC supply connects the various sensing units by means of a two-wire circuit. The central monitoring unit includes signalling devices to indicate the location of the intruder. The system also has the capability of initiating intruder warning devices.
516184
Ogilvy Renault
Uhlin Per Axel
LandOfFree
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