Capacitively coupled electromagnetic intrusion warning system

Details Capacitively coupled electromagnetic intrusion warning system Capacitively coupled electromagnetic intrusion warning system

1980-12-31

1982-12-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340564, G08B 1326

Patent

active

043664733

ABSTRACT:
An intrusion warning system for indicating the presence of an intruder to a given area comprises a single antenna line encircling the area insulated from the ground, a high frequency oscillator (e.g. of 1 kHz to 10 kHz) for feeding a 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 proximation of the intruder.

REFERENCES:
patent: 3764861 (1973-10-01), Orris
patent: 4064499 (1977-12-01), Geiszler et al.
patent: 4174518 (1979-11-01), Mongeon

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