Alarm system and method for detecting proximity of an object to

Details Alarm system and method for detecting proximity of an object to Alarm system and method for detecting proximity of an object to

1986-04-07

1987-06-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

212151, 340534, 340661, G08B 2100

Patent

active

046756647

ABSTRACT:
An antenna receives, by capacitive effect, a current of which the intensity is a function of the distance separating the antenna from an electrical power line. The other factors that influence the current are fixed, constant or are considered negligible. A measuring and conditioning circuit converts the current at the output of the antenna into a coded signal and transmits this coded signal to a control unit. The control unit compares the coded signal to predetermined values stored therein. Alarms are generated by the control unit when the current from the antenna exceeds the predetermined values.

REFERENCES:
patent: 3168729 (1965-02-01), Volberg
patent: 4330777 (1982-05-01), McDuff

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