Alarm device having a pick-up formed as a condenser with piezoel

Details Alarm device having a pick-up formed as a condenser with piezoel Alarm device having a pick-up formed as a condenser with piezoel

1995-02-17

1996-01-02

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

340566, G08B 1300

Patent

active

054812461

ABSTRACT:
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, or a glass window of a protected space. The condenser is connected with an electrometric amplifier, the signals of which are transmitted to an electronic alarm unit. When the glass pane is subjected 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 modified by the movements of a dielectrical body within the protected region.

REFERENCES:
patent: 3582692 (1971-06-01), Palini
patent: 4054867 (1977-10-01), Owens
patent: 4072936 (1978-02-01), Spirig
patent: 4495434 (1985-01-01), Diepers et al.
patent: 4884061 (1989-11-01), Genevois
patent: 4888581 (1989-12-01), Guscott

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