Intrusion warning system

Details Intrusion warning system Intrusion warning system

G - Physics

08

B

340/125, 340/124

G08B 13/18 (2006.01) G08B 13/24 (2006.01) G08B 13/26 (2006.01)

Patent

CA 1161517

ABSTRACT An intrusion warning system for indicating the presence of an intruder to a given area includes an antenna provided around the area and which is insulated from the ground; an oscil- lator is provided for feeding an alternating current signal to the antenna, and a coupling impedance is connected between an output of the oscillator and the antenna; the coupling impedance includes an arrangement to vary the impedance to an appropriate value such that the voltage fed to the antenna is approximately 50% of the voltage fed from the oscillator to the coupling imped- ance; by this arrangement the detection sensitivity is always kept at an optimum; the system also includes a signal processing apparatus for producing an output signal responsive to a change in the voltage of the alternating current on the antenna exceed- ing a predetermined level.

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