GB1190469A - Capacitive Transducer. - Google Patents

Capacitive Transducer.

Info

Publication number
GB1190469A
GB1190469A GB56394/68A GB5639468A GB1190469A GB 1190469 A GB1190469 A GB 1190469A GB 56394/68 A GB56394/68 A GB 56394/68A GB 5639468 A GB5639468 A GB 5639468A GB 1190469 A GB1190469 A GB 1190469A
Authority
GB
United Kingdom
Prior art keywords
ribbon
plate
voltage
insulating disc
centre
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.)
Expired
Application number
GB56394/68A
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.)
Bausch and Lomb Inc
Original Assignee
Bausch and Lomb Inc
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 Bausch and Lomb Inc filed Critical Bausch and Lomb Inc
Publication of GB1190469A publication Critical patent/GB1190469A/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
    • G01D5/2403—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

Landscapes

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

Abstract

1,190,469. Variable capacitors. BAUSCH & LOMB Inc. 27 Nov., 1968 [6 Dec., 1967], No. 56394/68. Heading H1M. [Also in Division G1] A capacitive transducer for measuring angular displacement comprises two fixed outer plates 26, 28 (Fig. 2), and a rotatable centre plate 30 acting as a shield. The fixed outer plate 28 consists of an insulating disc covered on one side with a thin film of copper 52; centre plate 30 consists of an insulating disc with one half of one side covered with a thin copper coating 50, outer plate 26 consists of an insulating disc covered on one side with a copper film divided into a semi-circular ribbon 44 (Fig. 4), and the remainder 42. The three plates are assembled in a housing with a shaft 16 attached to centre plate 30 by a bushing. An A.C. voltage is applied to end plate 28 (Fig. 10) and a voltage is developed on ribbon 44 depending on the capacitance between the ribbon and plate 28, which depends on the length of ribbon not shielded by centre plate 30. This voltage is therefore indicative of the angular position of shaft 16. The effect of the capacitance between the ribbon 44 and the plate 30 is eliminated by a high-gain amplifier 62 with negative feed-back via capacitor 64 connected to the ribbon, whereby the ribbon is maintained at substantially earth potential, i.e. at the same potential as plate 30. In modifications, the ribbon may be duplicated (Fig. 5, not shown) to measure over 360 degrees, or it may be wedge-shaped (Fig. 6, not shown) for a non-linear relationship.
GB56394/68A 1967-12-06 1968-11-27 Capacitive Transducer. Expired GB1190469A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68850067A 1967-12-06 1967-12-06

Publications (1)

Publication Number Publication Date
GB1190469A true GB1190469A (en) 1970-05-06

Family

ID=24764668

Family Applications (1)

Application Number Title Priority Date Filing Date
GB56394/68A Expired GB1190469A (en) 1967-12-06 1968-11-27 Capacitive Transducer.

Country Status (5)

Country Link
JP (1) JPS516549B1 (en)
DE (1) DE1813153B2 (en)
FR (1) FR1599174A (en)
GB (1) GB1190469A (en)
SE (1) SE356128B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237284A (en) * 1988-09-14 1993-08-17 Presidium Promotions Limited Measurement of capacitance and parameters related thereto for determining displacement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2149880C3 (en) * 1971-10-06 1981-12-03 Hartmann & Braun Ag, 6000 Frankfurt Automatic compensation device for current and voltage measurement
IT1102727B (en) * 1978-03-02 1985-10-07 Autovox Spa DETECTION DEVICE FOR THE ROTATION STATUS OF A SHAFT, IN PARTICULAR FOR TURNTABLES
CH642432A5 (en) * 1978-05-11 1984-04-13 Rotovolumetric Ag DEVICE WITH A CYLINDER, A SLIDING PISTON AND A CAPACITIVE TRANSDUCER.
NL7905562A (en) * 1979-07-17 1981-01-20 Heerens Willem Christiaan CAPACITIVE METER.
JPS5927278A (en) * 1982-08-06 1984-02-13 Mitsubishi Electric Corp Information transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237284A (en) * 1988-09-14 1993-08-17 Presidium Promotions Limited Measurement of capacitance and parameters related thereto for determining displacement

Also Published As

Publication number Publication date
DE1813153B2 (en) 1972-08-31
JPS516549B1 (en) 1976-02-28
FR1599174A (en) 1970-07-15
DE1813153A1 (en) 1969-06-19
SE356128B (en) 1973-05-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years