G - Physics
08
B
340/124.7
G08B 13/10 (2006.01) H01H 3/14 (2006.01) H01H 3/24 (2006.01)
Patent
CA 1088177
ABSTRACT OF THE DISCLOSURE The specification discloses a burglar alarm system which is capable of detecting changes of load on a certain sector of terrain. The system employs a sensor consisting of a flexible mat containing tubular, intercommunicating and inflatable channels bridged by a supportive, elastic plate over the entire extent of the mat. The channels contain a liquid or gas and any change in volume or pressure in the channels is sensed by a detector and the alarm is operated. In this way it is possible to provide a large-area sensor in which any load on the elastic plate is transmitted to the channels even when the mat is buried in soil which subsequently freezes.
281063
Hirmann Georg A.
Kagi Bruno
Kirby Eades Gale Baker
Multisafe Ag
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