AIP Digital Archive
Electrical Engineering, Measurement and Control Technology
A linear sensor of the differential capacitance type, possessing more than 120 dB dynamic range, has been developed. The electrical equivalent circuit is that of a symmetric bridge, whose four capacitor elements derive from two semicircular segments each of a rotor and a stator. When driven at a constant excitation voltage, and configured with a differential amplifier and synchronous detector; the sensor output is proportional to the angular displacement, from the nominal position, of the rotor compared to the stator.
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