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Capacitive angular-position sensor with electrically floating conductive rotor and measurement redundancy

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4 Author(s)
V. Ferrari ; Dept. of Electron. for Autom., Univ. of Brescia, Italy ; A. Ghisla ; D. Marioli ; A. Taroni

This paper presents a capacitive angular-position sensor with a contactless electrically floating conductive rotor and an interface electronic circuit that is designed to maximize the performance/cost ratio. The sensor includes two separate and independent measurement sections that sense the same angle and provide redundancy in critical applications. The electronic interface is based on a relaxation oscillator that, for each of the two sections, measures an appropriate quantity that relates capacitance ratio to angular position and provides a dc output voltage that varies ratiometrically with respect to the supply voltage. The sensor was built in a version with ±11° measuring range for each section. Experimental tests showed a linearity better that 1% of the span.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:55 ,  Issue: 2 )