Capacitive apparatus to monitor the integrity of a wall

Details Capacitive apparatus to monitor the integrity of a wall Capacitive apparatus to monitor the integrity of a wall

1988-05-26

1989-11-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340562, G08B 1322

Patent

active

048840610

ABSTRACT:
An apparatus for verifying the integrity of a wall automatically sets off an intervention in the case of an act committed against the wall. A capacitive sensor is formed on the external or internal surface of the wall and consists of a thin planar condenser matching the shape of the wall. An oscillator having variable frequency has its control input connected to a plate of the condenser, the other plate being connected to ground, and a circuit detects the variation of frequency of the output signal of the oscillator resulting from a variation of condenser capacitance.

REFERENCES:
patent: 1180246 (1916-04-01), Cregier
patent: 3550109 (1970-12-01), Kato
patent: 3633194 (1972-01-01), Kothe
patent: 3763795 (1973-10-01), Wetz, Jr.
patent: 4169260 (1979-09-01), Bayer

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