EP0273918A1 - Ameliorations apportees a des appareils optiques detecteurs de positions - Google Patents

Ameliorations apportees a des appareils optiques detecteurs de positions

Info

Publication number
EP0273918A1
EP0273918A1 EP19870901593 EP87901593A EP0273918A1 EP 0273918 A1 EP0273918 A1 EP 0273918A1 EP 19870901593 EP19870901593 EP 19870901593 EP 87901593 A EP87901593 A EP 87901593A EP 0273918 A1 EP0273918 A1 EP 0273918A1
Authority
EP
European Patent Office
Prior art keywords
zone plate
light
optical
position sensing
fiber
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Withdrawn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
EP19870901593
Other languages
German (de)
English (en)
Inventor
John Philip Dakin
Charles Robert Batchellor
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.)
Plessey Overseas Ltd
Original Assignee
Plessey Overseas Ltd
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 Plessey Overseas Ltd filed Critical Plessey Overseas Ltd
Publication of EP0273918A1 publication Critical patent/EP0273918A1/fr
Withdrawn legal-status Critical Current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
    • G01D5/268—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 using optical fibres
    • 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
    • G01D5/30—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 the beams of light being detected by photocells

Definitions

  • This invention relates to optical position sensing arrangements especially suitable for the remote measurement of the relative position or linear displacement of moving bodies.
  • One known optical position sensing arrangement for remotely measuring the relative position or displacement of a body comprises. a holographic zone plate which may be attached to the aforesaid body and a pair of optical fibres one of which carries from a remote light source white light for illuminating the holographic zone plate and the other of which having its end co-terminous with that of the other fibre collects monochromatic light reflected from the zone plate and having a centre wavelength representative of the distance between the ends of the optical fibres and the zone plate.
  • the collected light is conveyed by the optical fibre to a wavelength analyser which effectively provides an indication of the distance between the fibre ends and the zone plate.
  • the wavelength of the collected light will vary and the change in distance or displacement of the plate relative to the fibre ends will be indicated by t-he wavelength analyser.
  • This known arrangement suffers from the disadvantage that the light emerging from the optical fibre connected to the source of white light takes the form of a cone the semi-angle of which is determined by the fixed numerical aperture of the input fibre. Consequently, unless the zone plate is made sufficiently large some of the light emerging from the. fibre will not impinge on the plate and will therefore be wasted leading to overall optical inefficiency. The position could be alleviated by providing higher power white light sources and/or more sophisticated wavelength analysers.
  • an optical position sensing arrangement comprising two optical fibres and a holographic zone plate, in which lens means is interposed between the co-terminous ends of said fibres, along one of which (i.e. light transmission fibre) white light is conveyed from a remote light source, and the zone plate, whereby all of the light emerging from the end of the light transmission fibre is focused by said lens means so that it all impinges on the zone plate and in which the co-terminous end of the other fibre (i.e. light collecting fibre) collects all the light from the zone plate and conveys it to a wavelength analyser which indicates the wavelength of the collected light and thus the distance between the co-terminous ends of the optical fibres and the zone plate.
  • a wavelength analyser which indicates the wavelength of the collected light and thus the distance between the co-terminous ends of the optical fibres and the zone plate.
  • Figure 1 shows a known optical position sensing arrangement
  • Figure 2 shows an optical position sensing arrangement according to the present invention.
  • light derived from a white light source 1 is conveyed by an optical fibre 2 (i.e. light transmission fibre) to a remote location where it is utilised for the illumination of a holographic zone plate 3 in spaced relationship with the light emerging end of the optical fibre 2.
  • the zone plate 3 may be attached to a linearly movable body (not shown) while the end of the light transmission fibre 2 may be fixed.
  • Monochromatic light reflected by the zone plate 3 is arranged to be collected by the optical fibre 4 (i.e. light collecting fibre) which conveys h-he collected light to a wavelength analyser 5.
  • the wavelength of the collected light which will be determined by the analyser 5 will be dependent upon the distance L between the co-terminous ends of the fibres 2 and 4 and the zone plate 3. Any variation in this distance L will cause a change in the wavelength of the collected monochromatic light which will be detected by the analyser 5 and provide an indication of the position or displacement of the zone plate 3 relative to the fixed end of the optical fibre 2.
  • the efficiency of such position sensing arrangements is improved, as depicted in Figure 2, by providing a lens 6 which is interposed between the co-terminous ends of the light transmission and light collecting fibres 2 and 4 and the holographic zone plate 3.
  • a lens 6 which is interposed between the co-terminous ends of the light transmission and light collecting fibres 2 and 4 and the holographic zone plate 3.

Landscapes

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

Abstract

Un appareil détecteur à fibre optique ou de mesure à distance d'une position linéaire sert à acheminer par l'intermédiaire d'une fibre optique de la lumière blanche, afin d'illuminer une plaque de zone, d'où elle est réfléchie, son trajet retour s'effectuant le long d'une seconde fibre, disposée parallèlement à la première fibre, pour atteindre un analyseur de longueur d'onde, dont dépend la détermination de la position. Ledit appareil se caractérise par une lentille servant à focaliser la lumière blanche provenant de la première fibre sur la plaque de zone, ce qui permet d'éliminer toute perte due à la discordance angulaire, tandis qu'il est toujours possible de placer la seconde fibre par rapport à l'axe optique.
EP19870901593 1986-03-17 1987-03-17 Ameliorations apportees a des appareils optiques detecteurs de positions Withdrawn EP0273918A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8606550 1986-03-17
GB8606550A GB2188143B (en) 1986-03-17 1986-03-17 Improvements relating to optical position sensing arrangements

Publications (1)

Publication Number Publication Date
EP0273918A1 true EP0273918A1 (fr) 1988-07-13

Family

ID=10594739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870901593 Withdrawn EP0273918A1 (fr) 1986-03-17 1987-03-17 Ameliorations apportees a des appareils optiques detecteurs de positions

Country Status (4)

Country Link
EP (1) EP0273918A1 (fr)
JP (1) JPS63502852A (fr)
GB (1) GB2188143B (fr)
WO (1) WO1987005689A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110705689B (zh) * 2019-09-11 2021-09-24 清华大学 可区分特征的持续学习方法及装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2115139B (en) * 1982-02-10 1985-07-31 Marconi Co Ltd Remote monitoring of the position of a member
GB2129930A (en) * 1982-10-23 1984-05-23 Plessey Co Plc Improvements relating to optical detecting monitoring or measuring arrangements
GB2141541A (en) * 1983-06-14 1984-12-19 British Petroleum Co Plc Optical transducers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8705689A1 *

Also Published As

Publication number Publication date
GB2188143A (en) 1987-09-23
GB2188143B (en) 1989-12-20
GB8606550D0 (en) 1986-04-23
JPS63502852A (ja) 1988-10-20
WO1987005689A1 (fr) 1987-09-24

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19880217

AK Designated contracting states

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Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19891011

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19900221

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BATCHELLOR, CHARLES, ROBERT

Inventor name: DAKIN, JOHN, PHILIP