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1. WO2020095209 - A CAPACITIVE SENSING SYSTEM AND RELATED METHOD

Publication Number WO/2020/095209
Publication Date 14.05.2020
International Application No. PCT/IB2019/059509
International Filing Date 05.11.2019
IPC
G01F 23/26 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure, or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
26by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
CPC
G01F 23/265
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
26by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
263using capacitors
265for discrete levels
G01F 23/266
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
26by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
263using capacitors
266measuring circuits therefor
G01F 23/268
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
26by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
263using capacitors
268mounting arrangements of probes
Applicants
  • ELECTROLUX HOME PRODUCTS, INC. [US]/[US]
Inventors
  • HORNE, George Marshall
  • JOSEFSSON, Thomas
  • SMITH, Stephen
  • STOUFER, Paul
  • CHITTA, Vasantha K.
Agents
  • ANDERSON, Lauren F.
Priority Data
16/182,13206.11.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A CAPACITIVE SENSING SYSTEM AND RELATED METHOD
(FR) SYSTÈME DE DÉTECTION CAPACITIVE ET PROCÉDÉ ASSOCIÉ
Abstract
(EN)
A capacitive sensing system may include a fluid cup configured to receive a fluid, and processing circuitry and a capacitive sensor coupled to one another, the capacitive sensor is a distance separated from and in parallel with a top surface of the fluid in the fluid cup, the distance the capacitive sensor is separated from the top surface of the fluid being variable with a fill level of the fluid in the fluid cup. The capacitive sensor and the fluid in the fluid cup may form elements of a capacitor with a capacitance that is a function of at least the distance the capacitive sensor is separated from the top surface of the fluid. The processing circuitry may be configured to measure a change in signal corresponding to a change in capacitance of the capacitor and determine the fill level based on a magnitude of the change in signal.
(FR)
L'invention concerne un système de détection capacitive qui peut comprendre une coupelle de fluide configurée pour recevoir un fluide, et un circuit de traitement et un capteur capacitif couplés l'un à l'autre, le capteur capacitif étant séparé d'une distance et en parallèle avec une surface supérieure du fluide dans la coupelle de fluide, la distance selon laquelle le capteur capacitif est séparé de la surface supérieure du fluide étant variable selon un niveau de remplissage du fluide dans la coupelle de fluide. Le capteur capacitif et le fluide dans la coupelle de fluide peuvent former des éléments d'un condensateur avec une capacité qui est une fonction d'au moins la distance selon laquelle le capteur capacitif est séparé de la surface supérieure du fluide. Le circuit de traitement peut être configuré pour mesurer une variation d'un signal correspondant à une variation de capacité du condensateur et déterminer le niveau de remplissage sur la base d'une amplitude de la variation de signal.
Also published as
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