GB1012283A - Optical method and apparatus for the measurement of minute displacements - Google Patents

Optical method and apparatus for the measurement of minute displacements

Info

Publication number
GB1012283A
GB1012283A GB1388263A GB1388263A GB1012283A GB 1012283 A GB1012283 A GB 1012283A GB 1388263 A GB1388263 A GB 1388263A GB 1388263 A GB1388263 A GB 1388263A GB 1012283 A GB1012283 A GB 1012283A
Authority
GB
United Kingdom
Prior art keywords
members
gratings
supports
knife edges
april
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
GB1388263A
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Publication of GB1012283A publication Critical patent/GB1012283A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
    • 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)

Abstract

1,012,283. Optical gauging-measuring strain. TRAVAUX PUBLICS MINISTRE DES. April 8, 1963 [April 6,1962], No. 13882/63. Heading G1M. In a device for measuring minute displacements, two gratings 12,14 bearing similar arrays of fine parallel spaced lines thereon, are mounted in parallel planes and with the line array on one grating at a small angle to the other, by "T"- shaped members 11,13 the ends of which pass through apertures 1a, 2a, 1b, 2b in supports 1, 2 connected by flexing springs 3, 4. The members 11,13 are fulcrummed on knife edges connected to supports 1, 2 by spring members 6, 7, 9, 10. Knife edges 5, 8 are connected to reference points whose relative displacement is to be measured, e.g. two points on a structure if the device is to be used as a strain gauge, and relative movement of knife edges 5, 8 causes rotation of members 11, 13 either in the same direction, see Fig. 2, or in opposite directions, see Fig. 1. In the embodiment of Fig.1 this rotation increases the angle between the line arrays and thus alters the spacing between the interference fringes formed by the gratings. In the embodiment of Fig. 2 the net effect of rotating members 11, 13 is a parallel relative displacement between the line arrays thus causing a bodily shift of the fringe lines observed. The supports 1, 2 may be made of a material having a low thermal expansion coefficient and micrometer means may be provided to adjust the initial position of the gratings. The movement of the fringes can be recorded using a camera.
GB1388263A 1962-04-06 1963-04-08 Optical method and apparatus for the measurement of minute displacements Expired GB1012283A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR893545A FR1331961A (en) 1962-04-06 1962-04-06 Optical strain gauge method and device

Publications (1)

Publication Number Publication Date
GB1012283A true GB1012283A (en) 1965-12-08

Family

ID=8776237

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1388263A Expired GB1012283A (en) 1962-04-06 1963-04-08 Optical method and apparatus for the measurement of minute displacements

Country Status (4)

Country Link
CH (1) CH400614A (en)
FR (1) FR1331961A (en)
GB (1) GB1012283A (en)
LU (1) LU43462A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004081637A2 (en) * 2003-03-12 2004-09-23 Massachusetts Institue Of Technology Micro-actuated adaptive diffractive composites
CN100489447C (en) * 2007-10-11 2009-05-20 中国科学院长春光学精密机械与物理研究所 Detection platform for detecting non-contact type goniometer system accuracy
US9243895B2 (en) 2009-09-18 2016-01-26 Illinois Tool Works Inc. Remote displacement sensor, including an optical strain gauge, an assembly and system therewith
CN112284917A (en) * 2020-10-13 2021-01-29 青岛滨海学院 Device and method for measuring Young modulus of metal wire by utilizing diffraction of light

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004081637A2 (en) * 2003-03-12 2004-09-23 Massachusetts Institue Of Technology Micro-actuated adaptive diffractive composites
WO2004081637A3 (en) * 2003-03-12 2004-12-23 Massachusetts Institue Of Tech Micro-actuated adaptive diffractive composites
US6975459B2 (en) 2003-03-12 2005-12-13 Massachusetts Institute Of Technology Micro-actuated adaptive diffractive composites
CN100489447C (en) * 2007-10-11 2009-05-20 中国科学院长春光学精密机械与物理研究所 Detection platform for detecting non-contact type goniometer system accuracy
US9243895B2 (en) 2009-09-18 2016-01-26 Illinois Tool Works Inc. Remote displacement sensor, including an optical strain gauge, an assembly and system therewith
DE112010003179B4 (en) * 2009-09-18 2016-12-29 Illinois Tool Works, Inc. Optical displacement measuring device and method for measuring a displacement
CN112284917A (en) * 2020-10-13 2021-01-29 青岛滨海学院 Device and method for measuring Young modulus of metal wire by utilizing diffraction of light

Also Published As

Publication number Publication date
LU43462A1 (en) 1963-06-04
FR1331961A (en) 1963-07-12
CH400614A (en) 1965-10-15

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