System for measuring capacitance

Details System for measuring capacitance System for measuring capacitance

1998-09-21

2001-05-08

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

C073S29000R

Reexamination Certificate

active

06227046

ABSTRACT:

ORIGIN OF THE INVENTION
This invention was made by an employee of the United States Government and may be manufactured and used by or for the Government for governmental purposes without the payment of any royalties.
1. Field of the Invention
This invention relates to systems for measuring capacitances.
2. Background of the Invention
Frequently, it is important to know the level of liquids in a tank. Various methods have been proposed for determining liquid levels. It is known that a liquid level can be determined by positioning a capacitor inside the tank with either air or the liquid serving as a dielectric for the capacitor, depending on the level of the liquid in the tank. There must be a connection from the capacitor to a measuring circuit. Preferably, a coaxial cable is used to shield against any outside disturbance. However, the coaxial cable itself has some capacitance between its central conductor and the metallic shield. When the capacitance to be measured is very low and the coaxial cable is long, the inherent capacitance of the cable prevents an accurate measurement of the capacitance of the capacitor in the tank.


REFERENCES:
patent: 4676101 (1987-06-01), Baughman
patent: 5175505 (1992-12-01), Magenau
patent: 5365783 (1993-04-01), Zweifel
patent: 5546005 (1996-08-01), Rauchwerger
patent: 5611240 (1997-03-01), Yamaguchi
patent: 5907242 (1999-05-01), Gaurd

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