IN169142B - - Google Patents

Info

Publication number
IN169142B
IN169142B IN743/DEL/86A IN743DE1986A IN169142B IN 169142 B IN169142 B IN 169142B IN 743DE1986 A IN743DE1986 A IN 743DE1986A IN 169142 B IN169142 B IN 169142B
Authority
IN
India
Prior art keywords
prior
fibre
lines
optical
values
Prior art date
Application number
IN743/DEL/86A
Other languages
English (en)
Inventor
Arthur Harold Hartog
Martin Peter Gold
Adrian Philip Leach
Original Assignee
York 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 York Ltd filed Critical York Ltd
Publication of IN169142B publication Critical patent/IN169142B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • 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
    • G01D5/32—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
    • G01D5/35383—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 multiple sensor devices using multiplexing techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/39—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is projected from both sides of the fiber or waveguide end-face
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K2007/166—Electrical time domain reflectometry

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Transform (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Multicomponent Fibers (AREA)
  • Glass Compositions (AREA)
IN743/DEL/86A 1985-08-20 1986-08-18 IN169142B (ro)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858520827A GB8520827D0 (en) 1985-08-20 1985-08-20 Fibre-optic sensing devices

Publications (1)

Publication Number Publication Date
IN169142B true IN169142B (ro) 1991-09-07

Family

ID=10584041

Family Applications (1)

Application Number Title Priority Date Filing Date
IN743/DEL/86A IN169142B (ro) 1985-08-20 1986-08-18

Country Status (10)

Country Link
US (1) US4823166A (ro)
EP (1) EP0213872B1 (ro)
JP (1) JPH0746056B2 (ro)
AT (1) ATE84369T1 (ro)
AU (1) AU6157686A (ro)
DE (1) DE3687438T2 (ro)
DK (1) DK393686A (ro)
ES (1) ES2001244A6 (ro)
GB (1) GB8520827D0 (ro)
IN (1) IN169142B (ro)

Families Citing this family (123)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5560712A (en) * 1982-08-06 1996-10-01 Kleinerman; Marcos Y. Optical systems for sensing temperature and thermal infrared radiation
US5302025A (en) * 1982-08-06 1994-04-12 Kleinerman Marcos Y Optical systems for sensing temperature and other physical parameters
US5363463A (en) * 1982-08-06 1994-11-08 Kleinerman Marcos Y Remote sensing of physical variables with fiber optic systems
DE3627198A1 (de) * 1986-08-11 1988-02-18 Bbc Brown Boveri & Cie Anordnung zur zeitlich aufgeloesten optischen rueckstreumessung an lichtwellenleitern
IT1196798B (it) * 1986-11-24 1988-11-25 Cselt Centro Studi Lab Telecom Sensore distribuito di temperatura utilizzante una fibra ottica come elemento sensibile
GB8708148D0 (en) * 1987-04-06 1987-05-13 British Telecomm Radiation pulse generation
DE3717687C1 (de) * 1987-05-26 1988-12-01 Messerschmitt Boelkow Blohm Faseroptischer Stellwertgeber
JPH02114137A (ja) * 1988-10-25 1990-04-26 Asahi Glass Co Ltd 分布型光ファイバ温度センサーおよび温度測定方法
JPH0823512B2 (ja) * 1988-11-28 1996-03-06 日立電線株式会社 光ファイバ線状温度分布測定装置
US5125738A (en) * 1988-12-13 1992-06-30 Sumitomo Electric Industries, Ltd. Apparatus and system for locating a point or a faulty point in a transmission line
JPH0713582B2 (ja) * 1988-12-26 1995-02-15 株式会社東芝 測定装置
JPH0786436B2 (ja) * 1989-01-30 1995-09-20 東京電力株式会社 分布形光ファイバセンサのセンシング方法
JPH02133817U (ro) * 1989-04-07 1990-11-07
JP2540631B2 (ja) * 1989-04-21 1996-10-09 東京電力株式会社 電力ケ―ブル用光ファイバ式分布形温度計測装置
GB8912219D0 (en) * 1989-05-26 1989-07-12 Univ Manchester Sensing apparatus and method
FR2647931B1 (fr) * 1989-06-06 1994-09-09 Thomson Csf Reseau de capteurs relies a une centrale distante d'alimentation, de controle et de traitement
JPH0769223B2 (ja) * 1989-06-08 1995-07-26 旭硝子株式会社 温度測定方法および分布型光ファイバー温度センサー
US5113277A (en) * 1989-06-22 1992-05-12 Hitachi Cable Limited Fiber optic distributed temperature sensor system
DE69025186T2 (de) * 1989-06-29 1996-05-30 British Tech Group Production d'ondes porteuses optiques par effet stimule de diffusion brillouin
US4973853A (en) * 1989-07-28 1990-11-27 Gte Government Systems Corporation Remote subsurface water temperature measuring apparatus with Brillouin scattering
US4962319A (en) * 1989-07-28 1990-10-09 Gte Government Systems Corporation Remote subsurface water temperature measuring apparatus with Brillouin scattering
US4948958A (en) * 1989-08-01 1990-08-14 Gte Government Systems Corporation Remote subsurface water temperature measuring apparatus with brillouin scattering
US5008545A (en) * 1989-10-23 1991-04-16 Tektronix, Inc. High resolution optical fault locator
JPH03185322A (ja) * 1989-12-14 1991-08-13 Fujikura Ltd 光ファイバ式温度分布測定装置
JPH03205523A (ja) * 1989-12-30 1991-09-09 Fujikura Ltd 光ファイバ式温度分布測定装置
US5020872A (en) * 1990-01-04 1991-06-04 Smiths Industries Aerospace & Defense Systems Incorporated Method of operating an electrooptic modulator
JP2738127B2 (ja) * 1990-04-23 1998-04-08 日立電線株式会社 光ファイバ複合トロリ線の架線方法
US5144374A (en) * 1990-04-27 1992-09-01 Cselt - Centro Studi E Laboratori Telecommunicazioni S.P.A. Optical spectroscopy system
US5028146A (en) * 1990-05-21 1991-07-02 Kabushiki Kaisha Toshiba Apparatus and method for measuring temperatures by using optical fiber
US5090018A (en) * 1990-08-02 1992-02-18 Siemens Aktiengesellschaft Pulsed laser system for visually detecting faults in optical waveguides
JP2575324B2 (ja) * 1991-03-02 1997-01-22 株式会社フジクラ 光ファイバ式温度分布測定装置
US5272334A (en) * 1991-10-17 1993-12-21 Kabushiki Kaisha Toshiba Device for detecting a temperature distribution having a laser source with temperature and wavelength adjusting means
EP0553675A1 (de) * 1992-01-29 1993-08-04 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Überwachung der Temperatur in einem Turbinenbauteil
JPH0785057B2 (ja) * 1992-03-05 1995-09-13 紀本電子工業株式会社 微量成分の分析用ラマン分光計
US5449233A (en) * 1992-06-16 1995-09-12 Kabushiki Kaisha Toshiba Temperature distribution measuring apparatus using an optical fiber
JP2986038B2 (ja) * 1992-09-16 1999-12-06 安藤電気株式会社 ラマン散乱光測定による光ファイバの温度測定器
US5348396A (en) * 1992-11-20 1994-09-20 The United States Of America As Represented By The United States Department Of Energy Method and apparatus for optical temperature measurement
KR0133488B1 (en) * 1993-01-06 1998-04-23 Toshiba Kk Temperature distribution detector using optical fiber
DE4304545C2 (de) * 1993-02-11 1998-10-01 Felten & Guilleaume Energie Kabel mit Lichtwellenleitern
US5292196A (en) * 1993-02-17 1994-03-08 Kawasaki Steel Corporation Optical fiber type temperature distribution measuring apparatus
NL9300347A (nl) * 1993-02-24 1994-09-16 Nederland Ptt Optische ruisbron.
GB9315231D0 (en) * 1993-07-22 1993-09-08 York Ltd Optical time domain reflextometry
DE4332501A1 (de) * 1993-09-24 1995-03-30 Siemens Ag Sensorsystem für sich dynamisch ändernde Meßgrößen und zugehöriges Betriebsverfahren
DE4337402A1 (de) * 1993-10-26 1995-04-27 Mannesmann Ag Sonde zur Messung von Druck- und Temperaturprofilen
US5839830A (en) * 1994-09-19 1998-11-24 Martin Marietta Energy Systems, Inc. Passivated diamond film temperature sensing probe and measuring system employing same
EP0731906A1 (en) * 1994-10-03 1996-09-18 York Sensors Limited Monitoring wall temperatures of reactor vessels
US6033108A (en) * 1994-12-14 2000-03-07 Mcdermott Technology, Inc. Extended range fiber-optic temperature sensor
JPH08247858A (ja) * 1995-03-07 1996-09-27 Toshiba Corp 光温度分布センサ及び温度分布測定方法
FR2733080B1 (fr) * 1995-04-11 1997-07-04 Framatome Sa Procede et dispositif de detection et de surveillance du percement du fond de la cuve d'un reacteur nucleaire
DE69636967T2 (de) * 1995-09-20 2007-12-20 Arkray, Inc. Verfahren zur Analyse mittels Lichtstreuung
USH2002H1 (en) 1995-12-19 2001-11-06 The Dow Chemical Company Apparatus for conducting Raman spectroscopy using fiber optics
DE19618685C2 (de) 1996-05-09 1998-05-07 Daimler Benz Aerospace Airbus Verfahren und Anordnung zum Temperaturerfassen in Räumen, insbesondere in Passagier- oder Frachträumen in Flugzeugen
JPH10117424A (ja) * 1996-08-23 1998-05-06 Sumitomo Electric Ind Ltd 電力ケーブルの埋設深度測定方法
WO1998019800A1 (en) * 1996-11-04 1998-05-14 National Recovery Technologies, Inc. Application of raman spectroscopy to identification and sorting of post-consumer plastics for recycling
DE19732300A1 (de) * 1997-07-26 1999-02-11 Deutsche Telekom Ag Verfahren und Vorrichtung zum Aufnehmen und Auswerten von Parameterprofilen an optischen Fasern
GB9914788D0 (en) * 1999-06-25 1999-08-25 Sondex Ltd Downhole pressure measurement
US6606148B2 (en) * 2001-04-23 2003-08-12 Systems And Processes Engineering Corp. Method and system for measuring optical scattering characteristics
GB0111623D0 (en) * 2001-05-11 2001-07-04 Europ Org For Nuclear Research A cryogenic optical fibre temperature sensor
US6614514B2 (en) * 2001-07-16 2003-09-02 Fujikura Ltd. Distortion measuring apparatus and distortion measuring method using this apparatus
TW542908B (en) * 2001-11-30 2003-07-21 Univ Nat Chiao Tung Signal processing method to improve spatial resolution in the temperature distribution measurement
US20030205376A1 (en) * 2002-04-19 2003-11-06 Schlumberger Technology Corporation Means and Method for Assessing the Geometry of a Subterranean Fracture During or After a Hydraulic Fracturing Treatment
AU2003239514A1 (en) * 2002-05-31 2003-12-19 Sensor Highway Limited Parameter sensing apparatus and method for subterranean wells
US20030234921A1 (en) 2002-06-21 2003-12-25 Tsutomu Yamate Method for measuring and calibrating measurements using optical fiber distributed sensor
US6811307B2 (en) * 2002-07-10 2004-11-02 Kenneth J. Crowe DTS measurement of HV cable temperature profile
AU2002951705A0 (en) * 2002-09-27 2002-10-17 Crc For Intelligent Manufacturing Systems And Technologies Ltd Reflectometry
US6997256B2 (en) * 2002-12-17 2006-02-14 Sensor Highway Limited Use of fiber optics in deviated flows
BRPI0410224A (pt) * 2003-05-23 2006-05-09 Sensor Highway Ltd sistema sensor da temperatura distribuìda em fibra ótica
GB2404994A (en) * 2003-08-13 2005-02-16 Sensor Highway Ltd Optical fiber cable
KR100625807B1 (ko) * 2004-02-25 2006-09-20 한국과학기술원 브릴루앙 광섬유 센서를 이용하는 물리량 측정방법
DE102004015945B3 (de) * 2004-03-25 2005-12-29 Ufz-Umweltforschungszentrum Leipzig-Halle Gmbh Verfahren und Vorrichtung zur Bestimmung der Temperatur eines Mediums
US7919325B2 (en) * 2004-05-24 2011-04-05 Authentix, Inc. Method and apparatus for monitoring liquid for the presence of an additive
WO2006002689A1 (en) * 2004-07-07 2006-01-12 Agilent Technologies, Inc. Optical time domain reflectometry system at different wavelengths
EP1615011A1 (en) * 2004-07-08 2006-01-11 Shell Internationale Researchmaatschappij B.V. Method and system for obtaining physical data by means of a distributed fiber optical sensing cable
WO2006045340A1 (en) * 2004-10-27 2006-05-04 Agilent Technologies, Inc. Optical time domain reflectometry for determining distributed physical properties
DE212005000001U1 (de) * 2005-08-04 2006-02-16 Agilent Technologies, Inc. (n.d.Ges.d.Staates Delaware), Palo Alto Optische Reflektometrie-Analyse basierend auf Streusignalen erster und zweiter Ordnung
US7360412B2 (en) * 2006-02-16 2008-04-22 Welldynamics B.V. Single point and fiber optic temperature measurement for correction of a gas column weight in a well
US7628531B2 (en) * 2006-03-13 2009-12-08 SensorTran, Inc Methods and apparatus for dual source calibration for distributed temperature systems
US7628533B2 (en) * 2006-03-13 2009-12-08 SensorTran, Inc Systems and methods for detecting corrosion
JP4784387B2 (ja) * 2006-05-02 2011-10-05 日立電線株式会社 光ファイバ温度センサ
US7409133B2 (en) * 2006-10-05 2008-08-05 Harris Corporation Capillary waveguide tunable optical device
US7539361B2 (en) * 2006-10-05 2009-05-26 Harris Corporation Fiber optic device for measuring a parameter of interest
US7457495B2 (en) * 2006-10-05 2008-11-25 Harris Corporation Method of filtering optical signals with a capillary waveguide tunable optical device
EP1953536A1 (en) * 2007-01-31 2008-08-06 Agilent Technologies, Inc. Distributed physical property sensing using a fiber performing an enhanced raman scattering
CA2629902A1 (en) * 2007-04-26 2008-10-26 Oz Optics Ltd. Detection and location of breaks in distributed brillouin fiber sensors
KR100930342B1 (ko) * 2007-06-29 2009-12-10 주식회사 싸이트로닉 분포 광섬유 센서 시스템
ITBG20070042A1 (it) * 2007-07-31 2009-02-01 Milano Politecnico Sensore e metodo per determinare la temperatura lungo una fibra ottica.
ITBG20070041A1 (it) * 2007-07-31 2009-02-01 Milano Politecnico Filtro per un sensore di temperatura in fibra ottica e relativo metodo di filtraggio
US8077314B2 (en) * 2007-10-15 2011-12-13 Schlumberger Technology Corporation Measuring a characteristic of a multimode optical fiber
DE102008017740A1 (de) * 2008-04-07 2009-10-15 Lios Technology Gmbh Vorrichtung und Verfahren zur Kalibrierung eines faseroptischen Temperaturmesssystems
EP2172619A1 (en) 2008-10-03 2010-04-07 Services Pétroliers Schlumberger Fibre optic tape assembly
US9647750B2 (en) * 2009-02-20 2017-05-09 CommScope Connectivity Belgium BVBA Optical fibre test device
JP5267662B2 (ja) 2009-04-27 2013-08-21 富士通株式会社 線材の敷設状態解析方法及び敷設状態解析装置
DE102009020115B4 (de) * 2009-05-06 2013-07-18 Bundesanstalt für Materialforschung und -Prüfung (BAM) Fehlerkorrekturverfahren für einen faseroptischen Sensor und Meßvorrichtung
DE102010008480A1 (de) * 2009-09-30 2011-03-31 Sms Siemag Ag Kokille zur Verarbeitung von flüssigem metallischem Material
DE102010008944A1 (de) 2010-02-23 2011-08-25 SMS Siemag AG, 40237 Gießpfanne oder Zwischenbehälter zur Aufnahme eines flüssigen Metalls
CN106788694A (zh) 2010-05-27 2017-05-31 爱斯福公司 多采集otdr方法及装置
DE102010052434A1 (de) * 2010-11-24 2012-05-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Überwachung einer kryokonservierten biologischen Probe
GB201020827D0 (en) 2010-12-08 2011-01-19 Fotech Solutions Ltd Distrubuted optical fibre sensor
JP2013092388A (ja) 2011-10-24 2013-05-16 Yokogawa Electric Corp ファイバ温度分布測定装置
US9574949B2 (en) 2012-02-17 2017-02-21 Roctest Ltd Automated system and method for testing the efficacy and reliability of distributed temperature sensing systems
WO2013120162A1 (en) 2012-02-17 2013-08-22 Roctest Ltd. Automated system and method for testing the efficacy and reliability of distributed temperature sensing systems
US9618619B2 (en) * 2012-11-21 2017-04-11 Nikon Corporation Radar systems with dual fiber coupled lasers
US10119816B2 (en) 2012-11-21 2018-11-06 Nikon Metrology Nv Low drift reference for laser radar
GB2515574A (en) * 2013-06-28 2014-12-31 Tgs Geophysical Company Ltd Distributed optical sensing
US9360392B2 (en) * 2013-06-28 2016-06-07 Corning Cable Systems Llc Calibration of optical time domain reflectometry optical loss measurement in optical fibers having potentially dissimilar light backscattering efficiencies
AU2014385118B2 (en) * 2014-03-05 2017-04-06 Fujitsu Limited Abnormality detection system and abnormality detection method
CN104568228B (zh) * 2015-01-04 2017-04-12 山东微感光电子有限公司 Dts系统衰减系数不同时标定方法
JP6350736B2 (ja) * 2015-02-17 2018-07-04 富士通株式会社 判定装置、判定方法および判定プログラム
WO2016181542A1 (ja) 2015-05-13 2016-11-17 富士通株式会社 温度測定装置、温度測定方法および温度測定プログラム
WO2016181541A1 (ja) * 2015-05-13 2016-11-17 富士通株式会社 温度測定装置、温度測定方法および温度測定プログラム
AU2015394726B2 (en) 2015-05-13 2019-09-26 Fujitsu Limited Temperature measurement device, temperature measurement method, and temperature measurement program
EP3308478B1 (en) * 2015-06-11 2020-04-08 Nokia Technologies Oy Fibre-optic communication based on encoded frequency-shifted light
JP6561747B2 (ja) * 2015-10-05 2019-08-21 富士通株式会社 温度測定装置、温度測定方法および温度測定プログラム
GB201601060D0 (en) * 2016-01-20 2016-03-02 Fotech Solutions Ltd Distributed optical fibre sensors
US10101240B1 (en) 2017-04-27 2018-10-16 Viavi Solutions France SAS Optical time-domain reflectometer device including combined trace display
CN109115361B (zh) * 2018-07-26 2024-04-19 上海光织科技有限公司 基于渐变折射率分布的小芯径多模光纤的应用
US10914655B2 (en) * 2018-08-28 2021-02-09 Viavi Solutions Inc. Optical time-domain reflectometer device including multiple and bi-directional optical testing for fiber analysis
PL235969B1 (pl) * 2018-10-18 2020-11-16 El Cab Spolka Z Ograniczona Odpowiedzialnoscia Urządzenie do monitorowania temperatury, sposób monitorowania temperatury oraz system monitorowania temperatury
CN109342769B (zh) * 2018-12-10 2021-01-12 山东省科学院激光研究所 一种标定方法、流速测量方法及装置
CN111207857B (zh) * 2020-01-16 2021-02-26 国兴汇金(深圳)科技有限公司 一种利用分布式光纤温度传感器测量光纤长度的方法
US12055803B2 (en) * 2020-05-12 2024-08-06 Nec Corporation Distributed acoustic sensing using dynamic range suppression
EP3996295A1 (en) 2020-11-04 2022-05-11 Viavi Solutions Inc. High-speed bidirectional optical time-domain reflectometer (otdr)-based testing of device under test
US11431408B2 (en) 2020-11-04 2022-08-30 Viavi Solutions Inc. High speed bidirectional optical time-domain reflectometer (OTDR)-based testing of device under test

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204105A (en) * 1961-01-23 1965-08-31 Thompson Ramo Wooldridge Inc Infrared detector using a raman scattering medium
US3556659A (en) * 1966-02-03 1971-01-19 Applied Physics Corp Laser-excited raman spectrometer
US3770350A (en) * 1972-07-24 1973-11-06 Bell Telephone Labor Inc Method utilizing an optical fiber raman cell
US4081215A (en) * 1976-05-18 1978-03-28 General Electric Company Stable two-channel, single-filter spectrometer
US4215275A (en) * 1977-12-07 1980-07-29 Luxtron Corporation Optical temperature measurement technique utilizing phosphors
FR2422155A1 (fr) * 1978-04-06 1979-11-02 Saint Louis Inst Dispositif pour etudier un fluide par diffusion raman anti-stokes coherente et application s'y rapportant
EP0081702A1 (en) * 1981-11-25 1983-06-22 Kollmorgen Technologies Corporation Electro-optical system for color monitoring
US4459024A (en) * 1981-12-09 1984-07-10 Conoco Inc. Method and apparatus for light detection and ranging for use in visually obstructed areas
FR2520114A1 (fr) * 1982-01-18 1983-07-22 Lignes Telegraph Telephon Dispositif de localisation d'une cassure d'une fibre optique et utilisation d'un tel dispositif
GB2120779B (en) * 1982-03-31 1985-10-09 Komatsu Mfg Co Ltd Quantitative analysis in accordance with cars
GB2122337B (en) * 1982-05-18 1985-11-13 Nat Res Dev Fibre optic sensing device
US4555179A (en) * 1982-11-08 1985-11-26 John Langerholc Detection and imaging of objects in scattering media by light irradiation
GB2140554A (en) * 1983-05-26 1984-11-28 Plessey Co Plc Temperature measuring arrangement
DE3320894A1 (de) * 1983-06-09 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Optischer messgroessenaufnehmer
US4545253A (en) * 1983-08-29 1985-10-08 Exxon Production Research Co. Fiber optical modulator and data multiplexer
US4545679A (en) * 1984-02-21 1985-10-08 The United States Of America As Represented By The United States Department Of Energy Frequency shift measurement in shock-compressed materials
GB2170593B (en) * 1985-02-01 1988-09-14 Central Electr Generat Board Temperature measurement
GB2170594B (en) * 1985-02-04 1988-04-13 Central Electr Generat Board Measuring temperature

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DK393686D0 (da) 1986-08-19
GB8520827D0 (en) 1985-09-25
ES2001244A6 (es) 1988-05-01
DK393686A (da) 1987-02-21
EP0213872B1 (en) 1993-01-07
AU6157686A (en) 1987-02-26
EP0213872A3 (en) 1988-11-23
DE3687438D1 (de) 1993-02-18
DE3687438T2 (de) 1993-05-06
JPS62110160A (ja) 1987-05-21
US4823166A (en) 1989-04-18
JPH0746056B2 (ja) 1995-05-17
EP0213872A2 (en) 1987-03-11
ATE84369T1 (de) 1993-01-15

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