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GB1370307A - Apparatus for and method of determinging displacements using moire fringes - Google Patents

Apparatus for and method of determinging displacements using moire fringes

Info

Publication number
GB1370307A
GB1370307A GB4927571A GB4927571A GB1370307A GB 1370307 A GB1370307 A GB 1370307A GB 4927571 A GB4927571 A GB 4927571A GB 4927571 A GB4927571 A GB 4927571A GB 1370307 A GB1370307 A GB 1370307A
Authority
GB
United Kingdom
Prior art keywords
grating
gratings
photo
cells
scale grating
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
GB4927571A
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.)
Bendix Corp
Original Assignee
Bendix Corp
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 Bendix Corp filed Critical Bendix Corp
Publication of GB1370307A publication Critical patent/GB1370307A/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
    • G01D5/26—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

1370307 Photo-electric position measurement BENDIX CORP 22 Oct 1971 [23 Oct 1970] 49275/71 Heading G1A [Also in Division G4] Apparatus for measuring displacement comprising a pair of gratings 11, 13 relatively movable in front of photo-cells 21, 22, 23, 24 includes means 34 for interpolating between the grating lines and means for adjusting the spacing of the gratings. The gratings are selected to have a small number of grating lines per millimetre e.g. 40 in which case the apparatus is fairly insensitive to changes of the order of fortieth's of a millimetre in the spacing 30 between the gratings. As described a reading head 12 which is positioned adjacent their reflective scale grating 11, includes the transmissive indexing grating 13 and the four photo-cells 21-24 phase displaced from each other by 90 degrees. The cell outputs are fed in pairs via differential amplifiers 26, 27 which reduce electrical disturbances due to imperfections in the grating pattern, to a resistive phase divider 35 deriving 10 signals phase displaced by 36 degrees. These are fed via zero crossing detectors 40 to logic circuitry 42 which determines from the relative phase of the photocell outputs the direction of movement and pulses a reversible counter 45 connected to for example a visual display and a chart recorder. The position of the reading head is adjustable by loosening a screw (53), Fig.3 (not shown) so that a nut (54) may be moved in a slot (51) to produce the desired gap (30). The angle of the reading head and hence of the index lines relative to the scale grating is adjustable by an eccentric mechanism (56). Modifications: (1) only two photo-cells may be used. (2) the scale grating may be of cylindrical, frusto-conical or circular form. (3) either the scale grating or the index grating may be moved. (4) the scale grating may be of transmissive form.
GB4927571A 1970-10-23 1971-10-22 Apparatus for and method of determinging displacements using moire fringes Expired GB1370307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8339270A 1970-10-23 1970-10-23

Publications (1)

Publication Number Publication Date
GB1370307A true GB1370307A (en) 1974-10-16

Family

ID=22178001

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4927571A Expired GB1370307A (en) 1970-10-23 1971-10-22 Apparatus for and method of determinging displacements using moire fringes

Country Status (3)

Country Link
DE (1) DE2152803A1 (en)
FR (1) FR2113114A5 (en)
GB (1) GB1370307A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126336A (en) * 1982-08-26 1984-03-21 British Aerospace Detection of movement of a cyclic interference waveform such as in a ring laser gyroscope
GB2194042A (en) * 1986-08-14 1988-02-24 Bicc Plc Displacement measurement
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
CN117804348A (en) * 2024-03-01 2024-04-02 中国科学技术大学 A grating displacement sensor based on longitudinal moiré fringe correlation calculation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325803C2 (en) * 1983-07-16 1986-11-20 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Incremental photoelectric measuring device
US4979827A (en) * 1988-02-26 1990-12-25 Kabushiki Kaisha Okuma Tekkosho Optical linear encoder
CN117804349B (en) * 2024-03-01 2024-04-30 中国科学技术大学 Grating displacement sensor debugging method based on moire fringe correlation calculation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126336A (en) * 1982-08-26 1984-03-21 British Aerospace Detection of movement of a cyclic interference waveform such as in a ring laser gyroscope
GB2194042A (en) * 1986-08-14 1988-02-24 Bicc Plc Displacement measurement
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
CN117804348A (en) * 2024-03-01 2024-04-02 中国科学技术大学 A grating displacement sensor based on longitudinal moiré fringe correlation calculation
CN117804348B (en) * 2024-03-01 2024-04-30 中国科学技术大学 Grating displacement sensor based on longitudinal moire fringe correlation calculation

Also Published As

Publication number Publication date
FR2113114A5 (en) 1972-06-23
DE2152803A1 (en) 1972-04-27

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed