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Differential capacitance sensor as position detector for a magnetic suspension densimeterIn the present work, which consists of adapting a magnetic suspension densimeter for use at pressures up to 350 bars, a differential capacitance sensor is developed for use in the servosystem of a magnetic suspension densimeter for detecting the position of a magnetic buoy. This type of sensor has not been used previously in magnetic suspension densimeters. Its design, performance, and advantages are outlined. A cutaway drawing and a schematic diagram of the capacitance sensor and magnetic buoy are presented and described. The concentric-disk design of the sensor capacitor plates and the high degree of symmetry which results from the printed circuit fabrication approach minimize the sensor sensitivity to lateral displacement of the buoy and to the dielectric constant of the surrounding medium. A high-power microscope is necessary to monitor the position of the buoy relative to the support coil.
Document ID
19790066133
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Frederick, N. V.
(National Bureau of Standards Boulder, CO, United States)
Haynes, W. M.
(National Bureau of Standards Boulder, Colo., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1979
Publication Information
Publication: Review of Scientific Instruments
Volume: 50
Subject Category
Instrumentation And Photography
Accession Number
79A50146
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-78014-C
Distribution Limits
Public
Copyright
Other

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