Double-driven shield capacitive type proximity sensor

Details Double-driven shield capacitive type proximity sensor Double-driven shield capacitive type proximity sensor

1993-01-25

1995-08-15

Peng, John K.

Communications: electrical

Continuously variable indicating

With particular transmitter

340562, 324686, 324687, G08C 1910

Patent

active

054423473

ABSTRACT:
A capacity type proximity sensor comprised of a capacitance type sensor, a capacitance type reference, and two independent and mutually opposing driven shields respectively adjacent the sensor and reference and which are coupled in an electrical bridge circuit configuration and driven by a single frequency crystal controlled oscillator. The bridge circuit additionally includes a pair of fixed electrical impedance elements which form adjacent arms of the bridge and which comprise either a pair of precision resistances or capacitors. Detection of bridge unbalance provides an indication of the mutual proximity between an object and the sensor. Drift compensation is also utilized to improve performance and thus increase sensor range and sensitivity.

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