Patent
Capacitive path sensor with oscillator - has screening electrode between capacitor active and earthing electrodes, at same potential as active electrode
Josef Femboeck,Ernst Gabriel +1 more
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TLDR
In this paper, a path sensor system has an oscillator, a transmit and reception capacitance, a demodulator and a switching amplifier, with the oscillator comprising an externally influence capacitor (5) with an active electrode (6) and an earthing electrode (7).Abstract:
The path sensor system has an oscillator, a transmit and reception capacitance, a demodulator and a switching amplifier, with the oscillator comprising an externally influence capacitor (5) with an active electrode (6) and an earthing electrode (7). Between the two capacitor electrodes is fitted a screening electrode (11) at the same potential as the active electrode. Pref. a compensation electrode is provided for the effect of water on the sensor. The three above-mentioned electrodes, and possibly the compensation electrode are plate-shaped. All the electrodes may be flexible, e.g., of foils. The earthing electrode may be larger than the active electrode, and the screening electrode smaller than the earthing electrode. ADVANTAGE - Flat configuration for electromagnetic field with unidirectional stray effect.read more
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References
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Capacitive proximity detector
TL;DR: In this article, a capteur capacitif de proximite comprend deux electrodes mutuellement isolees electriquement connectees a un generateur de signaux and don au moins une est plate.
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TL;DR: A capacitive proximity initiator has a fully-insulated tubular housing on whose end side a sensor electrode is arranged as mentioned in this paper, where a protection electrode and a screening electrode are allocated to the sensor electrode.