Closed-field capacitive liquid level sensor

Title: Closed-field capacitive liquid level sensor

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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:: Kronberg, J W

Issue Date:: 1995-01-01

Research Org.:: Savannah River Site (SRS), Aiken, SC (United States)

Sponsoring Org.:: USDOE, Washington, DC (United States)

OSTI Identifier:: 463635

Patent Number(s):: 8408412

Application Number:: ON: DE97003864; PAN: 8-408,412; TRN: AHC29709%%72

Assignee:: US Dept. of Energy, Washington, DC (United States)

Patent Classifications (CPCs):: B - PERFORMING OPERATIONS B65 - CONVEYING B65D - CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS

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B - PERFORMING OPERATIONS B65 - CONVEYING B65D - CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS
B65D90/08 - Interconnections of wall parts
B65D88/524 - {and one or more side walls being foldable along an additional median line}

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DOE Contract Number:: AC09-89SR18035

Resource Type:: Patent

Resource Relation:: Other Information: PBD: 1995

Country of Publication:: United States

Language:: English

Subject:: 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; LEVEL INDICATORS; LIQUIDS; DESIGN; CAPACITANCE; INTERFERENCE; OSCILLATORS; PROBES

Citation Formats


                    Kronberg, J W. Closed-field capacitive liquid level sensor.  United States: N. p., 1995. 
        Web.

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                    Kronberg, J W. Closed-field capacitive liquid level sensor.  United States.

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                    Kronberg, J W. Sun .  
        "Closed-field capacitive liquid level sensor".  United States.  https://www.osti.gov/servlets/purl/463635.

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@article{osti_463635,

  title        = {Closed-field capacitive liquid level sensor},

  author       = {Kronberg, J 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         = {1995},

  month        = {1}

}

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