GB1138082A - Apparatus, e.g. for determining the position of a movable member, and method of using same - Google Patents

Apparatus, e.g. for determining the position of a movable member, and method of using same

Info

Publication number
GB1138082A
GB1138082A GB18700/66A GB1870066A GB1138082A GB 1138082 A GB1138082 A GB 1138082A GB 18700/66 A GB18700/66 A GB 18700/66A GB 1870066 A GB1870066 A GB 1870066A GB 1138082 A GB1138082 A GB 1138082A
Authority
GB
United Kingdom
Prior art keywords
cylinder
grating
photocells
photocell
shaft
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
GB18700/66A
Inventor
Clifford Roy Amsbury
Eric Warren
John Watson Hill
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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 Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB18700/66A priority Critical patent/GB1138082A/en
Publication of GB1138082A publication Critical patent/GB1138082A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses
    • G01D5/38—Forming the light into pulses by diffraction gratings
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/22—Analogue/digital converters pattern-reading type

Abstract

1,138,082. Shaft position encoders. ROLLS ROYCE Ltd. 19 April, 1967 [28 April, 1966], No. 18700/66. Heading G4H. Position measuring apparatus comprises a translucent cylinder on which is formed a diffraction grating with lines at an angle to the cylinder axis, and means to direct light through diametrically opposite sides of the cylinder to form a moirÚ fringe pattern. The position of the pattern may be directly indicative of the angular position of the cylinder, Fig. 1, (not shown). The position may be measured by counting the fringes with a photocell and a counter. Angular movements of a shaft 57, Fig. 2, may also be measured by a grating 44 on a cylinder 43 continuously rotated by a motor 51. Light from a source 45 is collimated by a lens 46 and passes through diametrically opposite portions of the grating 44. The rulings of the grating are inclined to the axis of cylinder 43 so that fringes are produced and detected by a bank of photocells 47. The cylinder 43 has a slot 53 which allows light to pass once per revolution from a source 56 to a fixed photocell 64 and a photocell 62 connected to the shaft 57. Photocells 64 and 62 respectively open and close a gate transferring pulses from the photocells 47 to a counter. The count recorded is thus proportional to the angular separation of cells 62 and 64.
GB18700/66A 1966-04-28 1966-04-28 Apparatus, e.g. for determining the position of a movable member, and method of using same Expired GB1138082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18700/66A GB1138082A (en) 1966-04-28 1966-04-28 Apparatus, e.g. for determining the position of a movable member, and method of using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18700/66A GB1138082A (en) 1966-04-28 1966-04-28 Apparatus, e.g. for determining the position of a movable member, and method of using same

Publications (1)

Publication Number Publication Date
GB1138082A true GB1138082A (en) 1968-12-27

Family

ID=10116913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18700/66A Expired GB1138082A (en) 1966-04-28 1966-04-28 Apparatus, e.g. for determining the position of a movable member, and method of using same

Country Status (1)

Country Link
GB (1) GB1138082A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975571A (en) * 1987-12-15 1990-12-04 Renishaw Plc Opto-electronic scale-reading apparatus
GB2239088A (en) * 1989-11-24 1991-06-19 Ricoh Kk Optical movement measurement
WO2001035059A1 (en) * 1999-11-08 2001-05-17 Ballado Investments, Inc. Device for the optical detection and measurement of linear movements
CN102735324A (en) * 2012-05-21 2012-10-17 山西大学 Device for measuring micro-vibration amplitude of object through laser single slit-single grating

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975571A (en) * 1987-12-15 1990-12-04 Renishaw Plc Opto-electronic scale-reading apparatus
US5355220A (en) * 1989-11-13 1994-10-11 Ricoh Company, Ltd. Optical movement measuring method and apparatus using interference fringes generated by overlapping spots of diffracted lights of different orders of diffraction from a line source
GB2239088A (en) * 1989-11-24 1991-06-19 Ricoh Kk Optical movement measurement
GB2239088B (en) * 1989-11-24 1994-05-25 Ricoh Kk Optical movement measuring method and apparatus
WO2001035059A1 (en) * 1999-11-08 2001-05-17 Ballado Investments, Inc. Device for the optical detection and measurement of linear movements
CN102735324A (en) * 2012-05-21 2012-10-17 山西大学 Device for measuring micro-vibration amplitude of object through laser single slit-single grating
CN102735324B (en) * 2012-05-21 2014-07-30 山西大学 Device for measuring micro-vibration amplitude of object through laser single slit-single grating

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