Measuring arrangement for capacitive security fences

Details Measuring arrangement for capacitive security fences Measuring arrangement for capacitive security fences

1983-06-02

1985-10-22

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

340564, G01R 1152

Patent

active

045491330

ABSTRACT:
A plurality of transmitters operating at respective frequencies is connected to at least some electrodes of a capacitive security fence. Each electrode is provided with a transformer whose primary winding is connected between the transmitter and ground. The secondary of each transformer is connected to a plurality of bandpass filters having adjustable center frequencies which correspond to the transmitter frequencies. The voltage available at the outputs of the bandpass filters are fed to a measuring device and supplied to a microcomputer. The interelectrode capacitances and the self-capacitances of the electrodes of the system are identified from the measured voltages which are proportional to the capacitances.

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