Method and arrangement for measuring changes of capacitive state

Details Method and arrangement for measuring changes of capacitive state Method and arrangement for measuring changes of capacitive state

1984-08-08

1987-08-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340664, G08B 1326

Patent

active

046849327

ABSTRACT:
At a security fence comprising a plurality of electrodes disposed in parallel, a transmitter applies an alternating voltage to at least one of the electrodes. Remaining electrodes are grounded as receive electrodes. An ammeter measures electrode current and a measured value corresponding to an operating capacitance of this electrode is acquired and provided in every electrode circuit. Disruption factors are compensated on the basis of these measured values by means of comparison to earlier measured values of the same or of the other electrodes and by means of comparison to specific measured value patterns. An alarm is triggered only given non-compensatable measured values.

REFERENCES:
patent: 2971184 (1961-02-01), Pearson et al.
patent: 3047849 (1962-07-01), Hansen
patent: 3103003 (1963-09-01), Roberts
patent: 3778807 (1973-12-01), Ralston
patent: 4389646 (1983-06-01), Tago
patent: 4549133 (1985-10-01), Metzner

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