Patent
Double-driven shield capacitive type proximity sensor
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TLDR
In this paper, a capacity type proximity sensor comprised of a capacitance type sensor, a 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.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.read more
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References
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Patent
Driven shielding capacitive proximity sensor
TL;DR: In this article, a capacitive proximity sensing element, backed by a reflector driven at the same voltage as and in phase with the sensor, is used to reflect the field lines away from a grounded robot arm towards an intruding object, thus dramatically increasing the sensor's range and sensitivity.
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Phase discriminating capacitive array sensor system
John M. Vranish,Wadi Rahim +1 more
TL;DR: A phase discriminating capacitive sensor array system as mentioned in this paper provides multiple sensor elements which are maintained at a phase and amplitude based on a frequency reference provided by a single frequency stabilized oscillator, and the adjustment made to the sensor signals is indicated by output signals which indicate the proximity of the object.
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