GB2020012A - Strain and displacement measuring gauges - Google Patents

Strain and displacement measuring gauges

Info

Publication number
GB2020012A
GB2020012A GB7913003A GB7913003A GB2020012A GB 2020012 A GB2020012 A GB 2020012A GB 7913003 A GB7913003 A GB 7913003A GB 7913003 A GB7913003 A GB 7913003A GB 2020012 A GB2020012 A GB 2020012A
Authority
GB
United Kingdom
Prior art keywords
movement
light
path
blocks
gauge
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.)
Withdrawn
Application number
GB7913003A
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.)
Hale K F
Original Assignee
Hale K F
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 Hale K F filed Critical Hale K F
Publication of GB2020012A publication Critical patent/GB2020012A/en
Withdrawn legal-status Critical Current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
    • G01D5/28—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 deflection of beams of light, e.g. for direct optical indication
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

A strain or displacement gauge has two blocks between which movement is measured; a fibre optic light path 2 is provided into the gauge and another fibre optic light path 4 is provided out of the gauge. The change in intensity of light transmitted along the path is a measure of movement between the blocks. A light source 1 supplies light to the gauge along path 2 and an optical detector 3 detects the light received along path 4. A light path can be provided in each block with the paths aligned with each other and movement between the blocks causes misalignment between the paths. Alternatively a shutter or attenuator or a device having markings (for digital measurement) can be interposed in the light path by an amount depending on the movement between the blocks. Sets of fibres may be used to give a vernier effect, and two dimensional measuring is possible. If each block carries a grating, Moiré fringes may be used to measure the movement. If the movement is arranged to rotate the polarisation of the light, this may be used to measure the movement. <IMAGE>
GB7913003A 1978-04-13 1979-04-12 Strain and displacement measuring gauges Withdrawn GB2020012A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1458578 1978-04-13

Publications (1)

Publication Number Publication Date
GB2020012A true GB2020012A (en) 1979-11-07

Family

ID=10043893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913003A Withdrawn GB2020012A (en) 1978-04-13 1979-04-12 Strain and displacement measuring gauges

Country Status (3)

Country Link
FR (1) FR2422932A1 (en)
GB (1) GB2020012A (en)
NO (1) NO791209L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194042A (en) * 1986-08-14 1988-02-24 Bicc Plc Displacement measurement
US5142588A (en) * 1990-01-29 1992-08-25 Matsushita Electric Industrial Co., Ltd. Method of and apparatus for measuring track displacement on a magnetic tape
WO2005047814A1 (en) * 2003-10-17 2005-05-26 Bed-Check Corporation Displacement sensor apparatus
US7319400B2 (en) 2003-10-17 2008-01-15 Bed-Check Corporation Method and apparatus for monitoring a restraint device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2623900B1 (en) * 1987-12-01 1991-01-04 Vauge Christian FIBER OPTIC MICRO-DISPLACEMENT SENSOR

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194042A (en) * 1986-08-14 1988-02-24 Bicc Plc Displacement measurement
US5142588A (en) * 1990-01-29 1992-08-25 Matsushita Electric Industrial Co., Ltd. Method of and apparatus for measuring track displacement on a magnetic tape
WO2005047814A1 (en) * 2003-10-17 2005-05-26 Bed-Check Corporation Displacement sensor apparatus
US7078676B2 (en) 2003-10-17 2006-07-18 Bed-Check Corporation Displacement sensor apparatus
US7319400B2 (en) 2003-10-17 2008-01-15 Bed-Check Corporation Method and apparatus for monitoring a restraint device

Also Published As

Publication number Publication date
NO791209L (en) 1979-10-16
FR2422932A1 (en) 1979-11-09

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)