Capacitive apparatus to monitor the integrity of a wall
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United States of America Patent
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-
Nov 28, 1989
Grant Date -
N/A
app pub date -
May 26, 1988
filing date -
May 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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