Intrusion warning system

G - Physics – 08 – B

Patent

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Details

340/124.3

G08B 13/22 (2006.01)

Patent

CA 1160314

ABSTRACT OF THE DISCLOSURE An intrusion warning system for indicating the presence of an intruder to a given area comprises a single antenna line provided around encircling around the area insulated from the ground, a high frequency oscillator (e.g. of 1 kHz to 10 kHz) for feeding the high frequency signal to the antenna, a coupling impedance, for example, a capacitor, connected between the output terminal of the oscillator and the antenna and a signal processing part which produces an alarm when detecting a voltage change over a predetermined level of the antenna induced by a proxmimation of the intruder.

368501

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