Capacitance proximity sensor

Details Capacitance proximity sensor Capacitance proximity sensor

1980-01-18

1982-08-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307246, 324 61R, 328 5, 340562, 340567, G08B 1326

Patent

active

043451675

ABSTRACT:
A method for detecting the change in the capacitance of an antenna caused by the approach of a person to the antenna, including the step of charging said antenna to a predetermined voltage relative to ground or a reference antenna, the step of discharging the antenna through a capacitor such that the voltage developed across the capacitor is proportional to the initial charge on the antenna, said charging and discharging steps being sequentially repeated, and the step of comparing the instantaneous voltage across the capacitor to the long term average voltage to detect transient changes caused by an increase in the antenna capacitance resulting from the approach of a person.

REFERENCES:
patent: 4004234 (1977-01-01), Juvinall
patent: 4081700 (1978-03-01), Hamilton

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