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GB2020815A - Displacement Sensor Using Differential Capacitor - Google Patents

Displacement Sensor Using Differential Capacitor

Info

Publication number
GB2020815A
GB2020815A GB7913445A GB7913445A GB2020815A GB 2020815 A GB2020815 A GB 2020815A GB 7913445 A GB7913445 A GB 7913445A GB 7913445 A GB7913445 A GB 7913445A GB 2020815 A GB2020815 A GB 2020815A
Authority
GB
United Kingdom
Prior art keywords
moving object
stationary members
graduations
pair
displacement sensor
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB7913445A
Other versions
GB2020815B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from JP4960578A external-priority patent/JPS54141657A/en
Priority claimed from JP14983678A external-priority patent/JPS5575613A/en
Priority claimed from JP14983778A external-priority patent/JPS5575614A/en
Application filed by Individual filed Critical Individual
Publication of GB2020815A publication Critical patent/GB2020815A/en
Application granted granted Critical
Publication of GB2020815B publication Critical patent/GB2020815B/en
Expired legal-status Critical Current

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
    • G01D5/241—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
    • G01D5/2417—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 separation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

A device for measuring an amount of movement of a moving object comprises sensor means comprising at least a moving object R and at least one pair of stationary members S1, S2 which are confronted with said moving object thereby forming at least one pair of differential capacitors therebetween, the confronting surfaces of said moving object and stationary members having graduations with the same pitch, the graduations of said stationary members being different by 180 DEG in phase from each other with respect to the graduations of said moving object; a pair of oscillators coupled to said capacitors formed in said sensor means; and a mixer for providing a difference frequency signal between the outputs of said oscillators; whereby a signal is provided of which the frequency is increased and decreased alternatively whenever said moving object makes a predetermined amount of movement with respect to said stationary members. <IMAGE>
GB7913445A 1978-04-26 1979-04-18 Displacement sensor using differential capacitor Expired GB2020815B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4960578A JPS54141657A (en) 1978-04-26 1978-04-26 Device for measuring displacement of moving body
JP14983678A JPS5575613A (en) 1978-12-04 1978-12-04 Measuring unit for amount of revolution for rotatory motion body
JP14983778A JPS5575614A (en) 1978-12-04 1978-12-04 Amount of movement measuring unit for straight movement mobile body

Publications (2)

Publication Number Publication Date
GB2020815A true GB2020815A (en) 1979-11-21
GB2020815B GB2020815B (en) 1983-02-09

Family

ID=27293687

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913445A Expired GB2020815B (en) 1978-04-26 1979-04-18 Displacement sensor using differential capacitor

Country Status (4)

Country Link
CH (1) CH630461A5 (en)
DE (2) DE2954266C2 (en)
FR (1) FR2424513A1 (en)
GB (1) GB2020815B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035340A3 (en) * 1980-02-28 1983-08-17 P.A. Consulting Services Limited Improved clinometer
US5237284A (en) * 1988-09-14 1993-08-17 Presidium Promotions Limited Measurement of capacitance and parameters related thereto for determining displacement
US6346818B2 (en) 1998-07-22 2002-02-12 British Aerospace Plc Capacitance position transducer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5759101A (en) * 1980-09-26 1982-04-09 Hiromi Ogasawara Noncontacting infinitesimal displacement gauge
DE19715078A1 (en) * 1997-04-11 1998-10-15 Univ Ilmenau Tech Capacitive displacement and angle measuring method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248962B (en) * 1967-08-31 Sogemque (Electronics) Limited Newport Pagnell Buckinghamshire (Großbritannien) Capacitive transmitter
DE1091346B (en) * 1958-10-22 1960-10-20 Licentia Gmbh Device for measuring the radial and axial play on rotating machines by means of a capacitive encoder
US3221251A (en) 1961-06-15 1965-11-30 Electronic Specialty Company Phase measuring at microwave frequencies with a closed loop servo system using travelling wave tubes
US3386292A (en) * 1964-09-28 1968-06-04 Ibm Digital accelerometer
FR1487368A (en) * 1966-05-10 1967-07-07 Ct D Etudes Et De Rech S De La Improvements in devices for measuring the displacement of a movable member relative to a fixed member
CH536891A (en) * 1971-03-10 1973-05-15 Dubied & Cie Sa E Pulse generator with electric reader for controlling the needles of a knitting machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035340A3 (en) * 1980-02-28 1983-08-17 P.A. Consulting Services Limited Improved clinometer
US5237284A (en) * 1988-09-14 1993-08-17 Presidium Promotions Limited Measurement of capacitance and parameters related thereto for determining displacement
US6346818B2 (en) 1998-07-22 2002-02-12 British Aerospace Plc Capacitance position transducer

Also Published As

Publication number Publication date
FR2424513A1 (en) 1979-11-23
DE2954266C2 (en) 1988-09-08
DE2916760C2 (en) 1984-05-03
CH630461A5 (en) 1982-06-15
FR2424513B1 (en) 1984-03-16
DE2916760A1 (en) 1979-10-31
GB2020815B (en) 1983-02-09

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990417