WO2010043391A3 - Capacitive null-mode displacement measurement technology - Google Patents

Capacitive null-mode displacement measurement technology Download PDF

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Publication number
WO2010043391A3
WO2010043391A3 PCT/EP2009/007386 EP2009007386W WO2010043391A3 WO 2010043391 A3 WO2010043391 A3 WO 2010043391A3 EP 2009007386 W EP2009007386 W EP 2009007386W WO 2010043391 A3 WO2010043391 A3 WO 2010043391A3
Authority
WO
WIPO (PCT)
Prior art keywords
stationary
displacement measurement
measurement technology
pairs
linear
Prior art date
Application number
PCT/EP2009/007386
Other languages
French (fr)
Other versions
WO2010043391A2 (en
WO2010043391A4 (en
Inventor
Jose A Carrasco
Francisco Garcia De Quiros
Original Assignee
Embedded Instruments And Systems Sl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Embedded Instruments And Systems Sl filed Critical Embedded Instruments And Systems Sl
Publication of WO2010043391A2 publication Critical patent/WO2010043391A2/en
Publication of WO2010043391A3 publication Critical patent/WO2010043391A3/en
Publication of WO2010043391A4 publication Critical patent/WO2010043391A4/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/2403—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by moving plates, not forming part of the capacitor itself, e.g. shields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2412—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap
    • G01D5/2415—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap adapted for encoders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/2405—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by varying dielectric

Abstract

Technique for sensing the absolute position of an object, in linear or rotary displacement, relative to a stationary object or the speed of displacement, is formed, in one embodiment, by two stationary elements and a moving element able to have a linear or rotary displacement when located between the stationary elements. The stationary elements have metallic coatings on their confronted sides to form eight capacitances whose value change when the moving element is displaced between them. Four pairs of sinusoidal waveforms are injected in the metallic tracks of one stationary element by the processing electronics whose amplitude is controlled to cancel each other in the metallic tracks of the confronted stationary element. The generation of the four pairs of sinusoidal waveforms occurs in a close loop that generates coarse and fine information of the position of the moving object. Such information is offered to a user as analog or digital.
PCT/EP2009/007386 2008-10-14 2009-01-12 Capacitive null-mode displacement measurement technology WO2010043391A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1036070A NL1036070C2 (en) 2008-10-14 2008-10-14 Capacitive null-mode displacement measurement technology.
NL1036070 2008-10-14

Publications (3)

Publication Number Publication Date
WO2010043391A2 WO2010043391A2 (en) 2010-04-22
WO2010043391A3 true WO2010043391A3 (en) 2010-10-07
WO2010043391A4 WO2010043391A4 (en) 2010-12-23

Family

ID=40987129

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/007386 WO2010043391A2 (en) 2008-10-14 2009-01-12 Capacitive null-mode displacement measurement technology

Country Status (2)

Country Link
NL (1) NL1036070C2 (en)
WO (1) WO2010043391A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3002562B1 (en) * 2014-10-03 2019-04-24 Ers-Societa' A Responsabilita' Limitata Absolute capacitative encoder
US10641597B2 (en) * 2018-02-22 2020-05-05 Bell Helicopter Textron Inc. Method and apparatus for a precision position sensor
DE102018209515A1 (en) * 2018-06-14 2019-12-19 BSH Hausgeräte GmbH Method for actuating an operating device, in which at least one correction value is determined, operating device and household appliance
CN112325756A (en) * 2020-09-04 2021-02-05 山东休普动力科技股份有限公司 Free piston engine rotor displacement sensor, rotor identification system and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732553A (en) * 1971-04-16 1973-05-08 Spearhead Inc Capacitive pick-off transducer
US3845377A (en) * 1972-04-20 1974-10-29 Nihon Regulator Kk Rotational angle transducer
FR2758183A1 (en) * 1998-01-29 1998-07-10 Magneti Marelli France Capacitive measurement appts. e.g. for angle measuring sensor or vehicle fuel gauge
US20020014891A1 (en) * 1997-03-21 2002-02-07 Georg Brasseur Capacitive angular displacement and angular rate sensor and measurement device for such transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732553A (en) * 1971-04-16 1973-05-08 Spearhead Inc Capacitive pick-off transducer
US3845377A (en) * 1972-04-20 1974-10-29 Nihon Regulator Kk Rotational angle transducer
US20020014891A1 (en) * 1997-03-21 2002-02-07 Georg Brasseur Capacitive angular displacement and angular rate sensor and measurement device for such transducer
FR2758183A1 (en) * 1998-01-29 1998-07-10 Magneti Marelli France Capacitive measurement appts. e.g. for angle measuring sensor or vehicle fuel gauge

Also Published As

Publication number Publication date
WO2010043391A2 (en) 2010-04-22
NL1036070C2 (en) 2010-04-15
WO2010043391A4 (en) 2010-12-23

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