Capacitance intrusion detection system

Details Capacitance intrusion detection system Capacitance intrusion detection system

G - Physics

08

B

340/124.2

G08B 13/26 (2006.01) G08B 29/04 (2006.01)

Patent

CA 1168725

D-23,063 ABSTRACT A capacitance intrusion detection system for use with a metal object or objects insulated from ground comprises a circuit for cyclically charging and discharging the object at a relatively low frequency, for example, less than 500 Hz, and simultaneously integrating the charge on the object to develop a DC voltage pro- portional to the capacitance of the object. The integrating net- work is AC coupled to a bandpass filter which passes signals having frequencies corresponding to changes in capacitance of the object caused by an intruder and these signals are applied to a threshold circuit for activating an alarm when an intrusion occurs. Tamper alarm circuits are provided to detect unauthorized disconnection of any portion of the protected object (decrease capacitance) or the addition of capacitance in an attempt to de- feat the system.

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