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Radial displacement sensor for non-contact bearingsA radial position sensor includes four capacitive electrodes oriented about a shaft, arranged in two diametrically opposite pairs. Sensor circuitry generates an output signal in proportion to the capacitance between the electrodes and the shaft; the capacitance between an electrode and the shaft increases as the shaft approaches the electrode and decreases as the shaft recedes from the electrode. The sensor circuitry applies an alternating voltage to one electrode of a pair and a 180 degree out of phase alternating voltage to the other electrode of the pair. The electrical responses of the two electrodes to their respective input signals are summed to form a radial deviation signal which is relatively free from the alternating voltage and accurately represents the position of the shaft relative to the electrodes of the pair.
Document ID
20080004585
Acquisition Source
Goddard Space Flight Center
Document Type
Other - Patent
Authors
McCormick, John A.
Sixsmith, Herbert
Date Acquired
August 24, 2013
Publication Date
May 5, 1998
Subject Category
Electronics And Electrical Engineering
Funding Number(s)
CONTRACT_GRANT: NAS5-31475
CONTRACT_GRANT: NAS5-30854
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,748,005
Patent Application
US-PATENT-APPL-SN-550709

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