Electric field change sensor employing mains wiring as the trans

Details Electric field change sensor employing mains wiring as the trans Electric field change sensor employing mains wiring as the trans

1981-12-29

1985-03-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340310R, 343720, G08B 1326

Patent

active

045048223

ABSTRACT:
A system for recognizing the intrusion of a conductive or semi-conductive article recognizes the intrusion of the article into an area having an ambient electric field by detecting changes in the electric field. The system basically consists of a transmitter for transmitting an electric field and a receiver for receiving the electric field and for detecting the changes in the field. The transmitter is adapted to be connected to the mains wiring whereby the ground of the mains wiring comprises the transmitting antenna of the system.

REFERENCES:
patent: 2355395 (1944-08-01), Rubenstein
patent: 4155078 (1979-05-01), Bowling et al.
patent: 4174518 (1979-11-01), Mongeon
patent: 4254413 (1981-03-01), Mongeon
patent: 4382252 (1983-05-01), Ohashi et al.

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