Capacitance-change transducer applied to rotating vane anemometry and tachometry
作者:
C.L.Smith,
期刊:
Proceedings of the Institution of Electrical Engineers
(IET Available online 1976)
卷期:
Volume 123,
issue 1
页码: 21-25
年代: 1976
DOI:10.1049/piee.1976.0004
出版商: IEE
数据来源: IET
摘要:
Electrical transducing methods for use in rotating-vane anemometry and tachometry are discussed and the advantages to be gained from a capacitance-change pickoff are outlined. Both a theoretical and practical analysis for the capacitance variation in such systems is given, leading to the conclusion that the resulting change, when converted into a voltage-time signal is ideally suited to cable and telemetry transmission. A simple transducingcircuit technique is then presented with measured results indicating that changes of less than 0.01 pF can readily be resolved. In addition, the circuit performance with high residual-capacitance values is investigated, the results of which have led to the development of an insertion-type flowmeter. The paper is concluded by illustrating the application of the techniques in a respiratory-flow transducer.
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