Proximity sensing circuit

Details Proximity sensing circuit Proximity sensing circuit

1974-09-20

1977-01-04

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328 5, 340258C, 328151, 307279, H03K 1700, G08B 1300

Patent

active

040016137

ABSTRACT:
A proximity sensor system includes first and second circuits connected at their inputs to a source of sampling pulses and at their outputs to a difference circuit. A proximity sensor is connected to the first circuit for modifying the amplitude of the signals produced at its output in response to the presence of an object in proximity to the sensor. The signals produced at the output of the second circuit are substantially independent of the presence of an object. The difference circuit produces an output signal indicative of which one of the first and second circuits produces the largest amplitude signal and is indicative of the presence or absence of an object. The proximity sensor may be comprised of a sheet or conductive material with a first wire connected between the sheet and the first circuit and a second wire isolated from the sheet but extending along the first wire and being connected to the second circuit.

REFERENCES:
patent: 3515984 (1970-06-01), King et al.
patent: 3517326 (1970-06-01), Roesch
patent: 3553575 (1971-01-01), Shea
patent: 3801976 (1974-04-01), Ross et al.
patent: 3829850 (1974-08-01), Guetersloh

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