G - Physics
08
B
G08B 13/22 (2006.01) G08B 13/04 (2006.01) G08B 13/14 (2006.01) G08B 13/26 (2006.01)
Patent
CA 2091051
ABSTRACT OF THE DISCLOSURE The device comprises a flat and elongated condenser with a piezoelectric dielectric material placed between two electrodes. This condenser is fastened to a barrier surface such as the glass pane of a display, a cupboard, a glass pane which delimits a protected space. The condenser is connected with an electrometric ampli- fier, the signals of which are transmitted to an electronic alarm unit. When the glass pane is submitted to shocks or to mechanical stresses due to an attempted break-in, the condenser will generate electrical signals able to trigger an alarm when they exceed a certain threshold. The condenser and the amplifier may also be adjusted so as to trigger an alarm when the electrical field is modi- fied by the movements of a dielectrical body within the protected region.
Moniere Henri
Seravalli Alessandro
Gowling Lafleur Henderson Llp
Verres Industriels S.a.
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