DocumentCode
1191925
Title
Elimination of the anomalous humidity effect in precision capacitance based transducers
Author
Bertone, Gregory A. ; Meiksin, Z.H. ; Carroll, Norman L.
Author_Institution
Electr. Instrum. Res. Ltd., Irwin, PA, USA
Volume
40
Issue
6
fYear
1991
fDate
12/1/1991 12:00:00 AM
Firstpage
897
Lastpage
901
Abstract
An anomalous humidity effect has been observed in a precision capacitor-based displacement transducer. This effect displays a threshold, well below the dew point, above which the capacitance change exceeds by far the increase in moisture-caused dielectric constant of the air dielectric. This effect, common to air capacitors in general, results from water vapor adsorption on insulator surfaces. It can be eliminated by shielding the capacitor in a way which removes the humidity sensitive flux from the internal electric field of the capacitor
Keywords
displacement measurement; electric sensing devices; transducers; air capacitors; anomalous humidity effect; dew point; dielectric constant; displacement transducer; humidity sensitive flux; moisture; precision capacitance based transducers; shielding; threshold; Capacitance; Capacitors; Dielectric constant; Dielectric measurements; Dielectrics and electrical insulation; Equations; Humidity; Moisture; Permittivity; Transducers;
fLanguage
English
Journal_Title
Instrumentation and Measurement, IEEE Transactions on
Publisher
ieee
ISSN
0018-9456
Type
jour
DOI
10.1109/19.119764
Filename
119764
Link To Document