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Title: Closed-field capacitive liquid level sensor

Abstract

A liquid level sensor based on a closed field circuit comprises a ring oscillator using a symmetrical array of plate units that creates a displacement current. The displacement current varies as a function of the proximity of a liquid to the plate units. The ring oscillator circuit produces an output signal with a frequency inversely proportional to the presence of a liquid. A continuous liquid level sensing device and a two point sensing device are both proposed sensing arrangements. A second set of plates may be located inside of the probe housing relative to the sensing plate units. The second set of plates prevent any interference between the sensing plate units.

Inventors:
 [1]
  1. Aiken, SC
Issue Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
OSTI Identifier:
871389
Patent Number(s):
5722290
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
closed-field; capacitive; liquid; level; sensor; based; closed; field; circuit; comprises; oscillator; symmetrical; array; plate; units; creates; displacement; current; varies; function; proximity; produces; output; signal; frequency; inversely; proportional; presence; continuous; sensing; device; proposed; arrangements; set; plates; located; inside; probe; housing; relative; prevent; interference; oscillator circuit; displacement current; level sensing; located inside; level sensor; output signal; liquid level; sensing device; sensor based; symmetrical array; circuit produces; inversely proportional; circuit comprises; closed field; continuous liquid; field circuit; current varies; /73/324/

Citation Formats

Kronberg, James W. Closed-field capacitive liquid level sensor. United States: N. p., 1998. Web.
Kronberg, James W. Closed-field capacitive liquid level sensor. United States.
Kronberg, James W. Thu . "Closed-field capacitive liquid level sensor". United States. https://www.osti.gov/servlets/purl/871389.
@article{osti_871389,
title = {Closed-field capacitive liquid level sensor},
author = {Kronberg, James W},
abstractNote = {A liquid level sensor based on a closed field circuit comprises a ring oscillator using a symmetrical array of plate units that creates a displacement current. The displacement current varies as a function of the proximity of a liquid to the plate units. The ring oscillator circuit produces an output signal with a frequency inversely proportional to the presence of a liquid. A continuous liquid level sensing device and a two point sensing device are both proposed sensing arrangements. A second set of plates may be located inside of the probe housing relative to the sensing plate units. The second set of plates prevent any interference between the sensing plate units.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

Patent:

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