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Title: Capacitive proximity sensor

Abstract

A proximity sensor based on a closed field circuit. The circuit comprises a ring oscillator using a symmetrical array of plates that creates an oscillating displacement current. The displacement current varies as a function of the proximity of objects to the plate array. Preferably the plates are in the form of a group of three pair of symmetric plates having a common center, arranged in a hexagonal pattern with opposing plates linked as a pair. The sensor produces logic level pulses suitable for interfacing with a computer or process controller. The proximity sensor can be incorporated into a load cell, a differential pressure gauge, or a device for measuring the consistency of a characteristic of a material where a variation in the consistency causes the dielectric constant of the material to change.

Inventors:
 [1]
  1. Aiken, SC
Issue Date:
Research Org.:
WESTINGHOUSE SAVANNAH RIVER CO
OSTI Identifier:
869327
Patent Number(s):
5315884
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
capacitive; proximity; sensor; based; closed; field; circuit; comprises; oscillator; symmetrical; array; plates; creates; oscillating; displacement; current; varies; function; plate; preferably; form; pair; symmetric; common; center; arranged; hexagonal; pattern; opposing; linked; produces; logic; level; pulses; suitable; interfacing; computer; process; controller; incorporated; load; cell; differential; pressure; gauge; device; measuring; consistency; characteristic; material; variation; causes; dielectric; constant; change; proximity sensor; displacement current; load cell; dielectric constant; process control; differential pressure; pressure gauge; process controller; sensor based; symmetrical array; pulses suitable; circuit comprises; closed field; field circuit; common center; current varies; /73/324/

Citation Formats

Kronberg, James W. Capacitive proximity sensor. United States: N. p., 1994. Web.
Kronberg, James W. Capacitive proximity sensor. United States.
Kronberg, James W. Sat . "Capacitive proximity sensor". United States. https://www.osti.gov/servlets/purl/869327.
@article{osti_869327,
title = {Capacitive proximity sensor},
author = {Kronberg, James W},
abstractNote = {A proximity sensor based on a closed field circuit. The circuit comprises a ring oscillator using a symmetrical array of plates that creates an oscillating displacement current. The displacement current varies as a function of the proximity of objects to the plate array. Preferably the plates are in the form of a group of three pair of symmetric plates having a common center, arranged in a hexagonal pattern with opposing plates linked as a pair. The sensor produces logic level pulses suitable for interfacing with a computer or process controller. The proximity sensor can be incorporated into a load cell, a differential pressure gauge, or a device for measuring the consistency of a characteristic of a material where a variation in the consistency causes the dielectric constant of the material to change.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

Patent:

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