NO854117L - Sensor med variabel fiberoptisk kobling. - Google Patents

Sensor med variabel fiberoptisk kobling.

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Publication number
NO854117L
NO854117L NO854117A NO854117A NO854117L NO 854117 L NO854117 L NO 854117L NO 854117 A NO854117 A NO 854117A NO 854117 A NO854117 A NO 854117A NO 854117 L NO854117 L NO 854117L
Authority
NO
Norway
Prior art keywords
sensor
medium
fiber optic
stated
load
Prior art date
Application number
NO854117A
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English (en)
Inventor
Lawrence Henry Gilligan
David William Gerdt
Original Assignee
Sperry Corp
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Publication of NO854117L publication Critical patent/NO854117L/no

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
    • G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
    • 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
    • G01D5/353—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 influencing the transmission properties of an optical fibre
    • G01D5/35338—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 influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35341—Sensor working in transmission
    • G01D5/35345—Sensor working in transmission using Amplitude variations to detect the measured quantity
    • 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
    • G01D5/353—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 influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/35377—Means for amplifying or modifying the measured quantity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/241—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
    • G02B6/2826—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals using mechanical machining means for shaping of the couplers, e.g. grinding or polishing
    • G02B6/283—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals using mechanical machining means for shaping of the couplers, e.g. grinding or polishing couplers being tunable or adjustable
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0128—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects
    • G02F1/0131—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
    • G02F1/0134—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence in optical waveguides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/31—Digital deflection, i.e. optical switching
    • G02F1/313—Digital deflection, i.e. optical switching in an optical waveguide structure
    • G02F1/3131—Digital deflection, i.e. optical switching in an optical waveguide structure in optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Optical Transform (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Description

Den foreliggende oppfinnelse vedrører fiberoptiske føl-
ere hvis drift er basert på variasjon av utgangseffekt-forholdet i en fiberoptisk retningskobler.
Følere, f.eks. akselerometere, mikrofoner, hydrofoner og magnetometere innbefattende både elektromekaniske anordninger og, mer nylig, fiberoptiske anordninger er vel-kjente. Fiberoptiske følere gir fordeler hva angår D.C.-følsomhet, dynamisk område og tilbakevisning av forstyrrelse.
Eksisterende fiberoptiske følere er basert på slike prin-sipper som lysfase-interferens, polarisasjonsrotasjon ved hjelp av dobbeltbrytning og mikrobøyetap. Tidligere kjente fiberoptiske følere kan generelt kategoriseres som en-ten amplitude- eller fase (interferometriske) følere.
Ved en amplitudeføler vil en fysikalsk perturbasjon vek-selvirke med fiberen eller en annen anordning som er direkte forbundet med fiberen, for modulasjon av lysinten-siteten i fiberen. Fasefølere som gir økt følsomhet i forhold til amplitudefølere, er omtalt av Giallorenzi,
et al i"Gptical Fibre Sensor Technology" IEEE Journal of Quantum Electronics, Vol. QE18, No. 4, April 1982,side 626-665. Selv om utviklingen innen fiberoptisk tekno-
logi har vært rask, gjenstår det praktiske problemer, f.eks. hva angår støykilder, detekteringsbehandling og pakking.
Den foreliggende oppfinnelse er definert i de vedføyde krav, og tilføyer en annen kategori av fiberoptiske føl-ere til teknikkens stilling, idet de kan betegnes som forholdsfølere ("ratio sensors"). Forholdet mellom lysenergi i utgangsfibrene endrer seg som reaksjon på på-
ført belastning på et medium som omgir en fiberoptisk retningskobler. Ved en utførelsesform skaffer den foreliggende oppfinnelse et fiberoptisk følerapparat, omfattende en sammensmeltet, skrå bikonisk retningskobler
omgitt av et påkjennings-dobbeltbrytende medium. En trans-duktormekanisme, f.eks. en prøvemasse for et akselerometer, et diafragma for en mikrofon eller trykkføler, eller en magnetostriktiv omhylning for et magnetometer, omformer den parameter som skal avføles til en kraft som påføres direkte på det påkjennings-dobbeltbrytende medium. Den påførte belastning som kan være ekstern eller intern i forhold til mediet, endrer brytningsindeksen for det dobbeltbrytende medium, noe som bevirker at forholdet med hensyn til ut-gangseffekt i hver gren av retningskobleren varierer.
En fiberoptisk føler i henhold til den foreliggende oppfinnelse vil nå bli omtalt i ytterligere detalj ved hjelp av et eksempel under henvisning til den vedføyde tegning. Figur 1 viser komponentene i en variabel kobler for en fiberoptisk føler i henhold til en utførelsesform for oppfinnelsen. Figur 2a er et tverrsnitt gjennom en føler i henhold til den foreliggende oppfinnelse, uført som et akselerometer.
Figur 2b er et snitt etter linjen 2b-2b på figur 2a.
En beskrivelse og analyse av bikoniske singelmodus-fiberoptiske koblere som kan brukes i forbindelse med den foreliggende oppfinnelse, er utført av J. Bures et al i en artikkel med tittelen "Analyse d'un Coupleur Bidirection-nel a Fibres Optiques Monomodes Fusionnes", Applied Op-tics, (journal of the Optical Society of America) Vol. 22, No. 12, June 15, 1983,side 1918-1922, og er herved inn-lemmet som referanse.
Idet det henvises til figur 1, er det her anskueliggjort den fiberoptiske føler 10 med variabel kobler i henhold til den foreliggende oppfinnelse. En sammensmeltet fiberoptisk retningskobler 11 er fremstilt av to innfibre 12 ved hjelp av kjente teknikker. Det resulterende liv parti 13 har en redusert diameter på grunn av smelte- og strekkeoperasjonene. Ved livpartiet 13 vil kjernene 18 for fibrene miste sine føringsegenskaper, og livpartiet 13 som en helhet kan f.eks. i tverrsnitt bli en eliptisk formet føringselement med det omgivende medium 15 for kappe. Således vil den bikoniske smeltede retningskobler 11 i livpartiet 13 fremstå for alle praktiske for-mål som en singelfører hvor kjernene 18 i de opprinne-lige fibre 12 spiller en. ubetydelig rolle, og kobling av lysenergi til to utgangsfibre 14 utføres ved hjelp av et støt-fenomen mellom to modi i livpartiet 13. Den opp-deling av optisk energi i utfibrene 14 som er bevirket av støtfenomenet, er en funksjon både av de fysiske dimen-sjoner for det sammensmeltede livparti 13 og brytningsindeksen for det medium 15 som omslutter livpartiet 13. Mediet 15 kan f.eks. være et belastnings-dobbeltbrytende materiale, dvs. et materiale hvor brytningsindeksen er proporsjonal med påført belastning. Et eksempel på belastnings-dobbeltbrytende materiale som egner seg til bruk som mediet 15 ifølge den foreliggende oppfinnelse, er en silikonelastomer, f.eks. den som produseres av General Electric Co., og er kjent som RTV-12. Imidlertid kan et-hvert materiale med en brytningsindeks som varierer som en funksjon med påført belastning, være anvendelig for utøvelse av den foreliggende oppfinnelse.
I praksis vil en inngangsfiber 12 bli belyst av en kilde
med optisk energi 16 som kan være en infrarød kilde. Den optiske energi blir oppdelt ved hjelp av den sammensmeltede bikoniske retningskobler, og forbundet med utgangsfibrene 14 med et forhold som endrer seg alt ettersom brytningsindeksen for mediet 15 endrer seg som en funksjon av påtrykt belastning. Endringene i optisk energi i utgangsfibrene 14 ble målt med hjelp av to fotodetektorer 17 som skaffer elektriske inngangssignaler til en differensialforsterker 19. Således vil utgangssignalet fra differensial-forsterkeren 19 være representativt for den belastning som påføres mediet 15.
Belastning kan påføres den fiberoptiske føler 10 ved hjelp av en intern eller ekstern mekanisme. For påføring av belastning internt kan det fremskaffes en mikroskopisk be-lastningstilstand ved tilsetning av forskjellige materialer til mediet 15, ideelt i form av mikroskopiske partik-ler som blir blandet inn i mediet 15 før herding. F.eks. kan der for avføling av elektriske felter tilsettes et elektrostriktivt pulvermateriale, f.eks. PVF2til mediet 15. Den foreliggende oppfinnelse kan benyttes som en termisk føler ved tilsetning av et termisk ekspansivt materiale, f.eks. nikkel eller aluminium, til mediet 15. For av-føling av magnetiske felter kan der til mediet 15 tilsettes en magnetostriktiv legering, f.eks. nikkel eller jern. Po-lystyren eller nylon kan tilsettes mediet 15 for økning av følsomheten når den foreliggende oppfinnelse blir brukt som en akustisk føler.
Belastning kan påføres eksternt ved hjelp av en kraft som overføres direkte til mediet 15. Ytre belastning kan på-føres mediet 15 ved hjelp av makroskopiske anordninger, f.eks. diafragmer, vektstenger, elektrostriktive, mag-netostriktive og termostriktive elementer. Generelt vil en hvilken som helst mekanisme som omformer en fysisk eller feltvirkning til en kraft benyttes for påføring av belastning på et belastnings-dobbeltbrytende materiale, og derved bli avfølt av optiske organer ved hjelp av den foreliggende oppfinnelse.
Slik det fremgår av figur 2a og 2b, er der vist en utfør-elsesform for den foreliggende oppfinnelse brukt som et akselerometer 20. En sammensveiset, bikonisk, retnings-forholds-kobler 11, plassert inne i en stiv sylinder 22. Inngangsfibre 12 og utgangsfibre 14 strekker seg gjennom sylinderveggen, og holdes på plass ved hjelp av en epoksy-harpiks 23. Det indre av sylinderen 22 er fyllt med en belastnings-dobbeltbrytende silikonelastomer 15, f.eks. General Electric RTV-12, omtalt ovenfor, som omkapsler
den sammensmeltede, bikoniske retningskobler 11. En
prøvemasse 25 plassert på toppen av det belastnings-dobbelbrytende medium 15 ved midtpartiet av sylinderen 22. Forholdet med hensyn til utgangseffekten, og endringen i forholdet for utgangseffekten proporsjonalt med påtrykt belastning er en funksjon av de optiske ma-terielle og geometriske egenskaper for apparatet. Mer spesielt innbefatter koblingsforhold-faktorene: 1. Brytningsindeksen for mediet 15; 2. Lengden av livpartiet 13; 3. Lengden av overføringspartiet mellom livpartiet 13 og inngangsfibrene 12 og utgangsfibrene 14; 4. Diameteren av fibrene 12 og 14 og diameteren av livpartiet 13; 5. Bølgelengden av lyskilden 16;
6. Egenskapene hos den valgte fiber.
Ved valg av en passende materialkonfigurasjon kan man oppnå ønskede driftspunkter og endringer i utgangseffekt-forhoIdene.

Claims (8)

1. Fiberoptisk føler omfattende fiberoptiske koblerorganer (13) for deling av innkommende lysenergi blant en flerhet av utgangsfibre, karakterisert ved at føleren ytterligere omfatter et medium (15) for inn-kapsling av de fiberoptiske koblerorganer, idet brytningsindeksen for mediet er en funksjon av den belastning som påføres mediet, samt detektororganer (17, 19) for frem-skaffelse av et utgangssignal som representerer forholdet med hensyn til energi i utgangs fibrene.
2. Føler som angitt i krav 1, karakterisert ved at mediet (15) er en belastnings-dobbeltbrytende silikonelastomer.
3. Føler som angitt i krav 1 eller 2, karakterisert ved at der påføres en ytre belastning på mediet (15) .
4. Føler som angitt i krav 1 eller 2, karakterisert ved at der på mediet (15) påtrykkes en indre belastning ved deri å kombinere materialer som reagerer på et parameter som skal avføles.
5. Føler som angitt i et av de foregående krav, karakterisert ved at den fiberoptiske kobler (13) er en sammensmeltet, avsmalnet, bikonisk, retningsfiberop-tisk kobler.
6. Føler som angitt i et av de foregående krav, karakterisert ved at den innkommende lysenergi er infrarød energi.
7. Føler som angitt i et av de foregående krav, karakterisert ved at detektororganene omfatter en flerhet av fotodetektor-dioder (17) anordnet for å motta energi fra utfiberne, og en differensialforsterker (19) til å motta utgangssignalex fra fotodetektor-diod-ene og skaffe utsignalet.
8. Føler som angitt i et av de foregående krav, karakterisert ved at føleren er konstruert som et akselerometer, og at kobleren (13) og mediet (15) rommes i et hus (22) med inn- og utfibre (12, 14) rag-ende gjennom husveggen.
NO854117A 1984-10-17 1985-10-16 Sensor med variabel fiberoptisk kobling. NO854117L (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/661,630 US4634858A (en) 1984-10-17 1984-10-17 Variable coupler fiberoptic sensor

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Publication Number Publication Date
NO854117L true NO854117L (no) 1986-04-18

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US (1) US4634858A (no)
EP (1) EP0178806A3 (no)
JP (1) JPS6197628A (no)
CA (1) CA1239294A (no)
NO (1) NO854117L (no)

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CA1239294A (en) 1988-07-19
EP0178806A2 (en) 1986-04-23

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