Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1979-01-12
1980-08-26
Hix, L. T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
340686, 324 59, G01R 2726
Patent
active
042197406
ABSTRACT:
A proximity sensing system including an improved variable inductance measuring technique to provide an indication of the proximity of a target object to a remote sensor unit 10 which includes a sensor inductor. A variable inductance measuring apparatus measures the inductance of the sensor inductor, which inductance corresponds to the proximity of a target object. The variable inductance measuring network includes a sensor current pulse generator 20 which, in each of successive system periods, establishes a time-varying current through the sensor unit 10. A sensor control loop stage 30 senses when the resulting sensor voltage reaches a predetermined level and then captures the sensor current so as to clamp the sensor voltage at this level. A retrieval stage 40 then determines the rate of change of the sensor current at the time the sensor current is zero, establishing a calibrated analog voltage of the inductance of the sensor inductor which is substantially temperature independent. The inductance analog voltage is applied to a proximity detection and switching stage 50 which provides a quantized target-near detection pulse if the inductance analog voltage corresponds to a threshold proximity of the target object. Integration over successive system periods then provides a time-average proximity voltage which is applied to a Schmitt trigger and proximity switching network 58, the output of which indicates the proximity of the target object to the sensor inductor with respect to a threshold actuation gap.
REFERENCES:
patent: 3454869 (1969-07-01), Strauss et al.
patent: 3469204 (1969-10-01), Magyar
patent: 3514627 (1970-05-01), Bridgeman
Dwyer James L.
ELDEC Corporation
Hix L. T,.
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