Volume charge density measuring system
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United States of America Patent
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-
Jul 1, 2003
Grant Date -
N/A
app pub date -
May 19, 2000
filing date -
Dec 3, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitive sensor includes one or more chambers through which a material can flow. Two conductors are located to partially surround the flow chamber so that the material flows between the conductors. Where more than one chamber is used, additional conductors are provided. A measurement circuit connected to the conductors provides an output corresponding to a difference between test and reference frequencies. A display indicates the measured capacitance as a continuous-scale, proportional representation or a binary representation. The sensor system can measure volume charge density of a fluid or parameters responsive to changes in volume charge density, such as flow velocity.
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