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WO1987007014A3 - Detection spatiale considerablement amelioree de retrodiffusion optique appliquee a des detecteurs - Google Patents

Detection spatiale considerablement amelioree de retrodiffusion optique appliquee a des detecteurs Download PDF

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Publication number
WO1987007014A3
WO1987007014A3 PCT/GB1987/000301 GB8700301W WO8707014A3 WO 1987007014 A3 WO1987007014 A3 WO 1987007014A3 GB 8700301 W GB8700301 W GB 8700301W WO 8707014 A3 WO8707014 A3 WO 8707014A3
Authority
WO
WIPO (PCT)
Prior art keywords
backscatter
enhanced
transmitted
signal
amplitude
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.)
Ceased
Application number
PCT/GB1987/000301
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English (en)
Other versions
WO1987007014A2 (fr
Inventor
Jeremy Kenneth Arthur Everard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1987007014A2 publication Critical patent/WO1987007014A2/fr
Publication of WO1987007014A3 publication Critical patent/WO1987007014A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G01M11/3118—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR using coded light-pulse sequences
    • 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
    • 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
    • G01M11/3172—Reflectometers detecting the back-scattered light in the frequency-domain, e.g. OFDR, FMCW, heterodyne detection
    • 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
    • G01M11/319—Reflectometers using stimulated back-scatter, e.g. Raman or fibre amplifiers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Optical Transform (AREA)

Abstract

Une séquence de bit pseudo-aléatoire est modulée en amplitude sur une source de lumière (2) (d'autres types de modulation sont exposés dans le descriptif de l'invention) et ce faisceau modulé est transmis le long d'une fibre optique (3) ou sur un autre matériau, le signal rétrodiffusé détecté étant multiplié (9) avec une version de référence numériquement retardée de la séquence transmise. En faisant varier le retard entre la séquence transmise et la séquence de référence pseudo-aléatoire, on peut recueillir des informations spatiales avec des rapports signal/bruit améliorés par rapport à ce que l'on obtient par des techniques conventionnelles de réflectométrie optique du domaine des temps. On obtient ainsi des améliorations dans le rapport signal/bruit détecté de la rétrodiffusion, ce qui a pour conséquence des temps réduits de moyenne de signaux ou une puissance de pointe transmise réduite. Cette technique peut être utilisée pour produire des détecteurs techniques améliorés, qui détectent tout paramètre extérieur dont dépend la rétrodiffusion lors de l'utilisation de systèmes vidéo, et pour produire une détection cohérente. Des techniques améliorées de mesurage des pertes dans la fibre et des techniques améliorées de mesurage de la discontinuité de la fibre sont également décrites. Des détecteurs de températures réparties utilisant la rétrodiffusion de Billouin et Raman sont décrits. Grâce à une détection améliorée, la résolution spatiale d'un temps de moyenne de signaux donné peut être réduite. Le mesurage de l'amplitude, des spectres, de la phase et de la polarisation de la diffusion peut également être utilisé pour caractériser les propriétés du matériau et l'influence de tous les paramètres externes sur les propriétés des matériaux produisant la rétrodiffusion. Le mesurage de la rétrodiffusion peut par conséquent être utilisé pour mesurer n'importe quel champ ou paramètre externe qui influence l'amplitude, la fréquence, la phase et la polarisation de la rétrodiffusion.
PCT/GB1987/000301 1986-05-09 1987-05-07 Detection spatiale considerablement amelioree de retrodiffusion optique appliquee a des detecteurs Ceased WO1987007014A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8611405 1986-05-09
GB8611405A GB2190186B (en) 1986-05-09 1986-05-09 Greatly enhanced spatial detection of optical backscatter for sensor applications

Publications (2)

Publication Number Publication Date
WO1987007014A2 WO1987007014A2 (fr) 1987-11-19
WO1987007014A3 true WO1987007014A3 (fr) 1987-12-03

Family

ID=10597631

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000301 Ceased WO1987007014A2 (fr) 1986-05-09 1987-05-07 Detection spatiale considerablement amelioree de retrodiffusion optique appliquee a des detecteurs

Country Status (2)

Country Link
GB (1) GB2190186B (fr)
WO (1) WO1987007014A2 (fr)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH677281A5 (en) * 1988-08-30 1991-04-30 Asea Brown Boveri Optical time domain reflectometry system - uses complementary pseudo-random pulse sequence for compensating reflections
EP0379609B1 (fr) * 1989-01-24 1993-07-28 Hewlett-Packard GmbH Procédé et dispositif d'utilisation de réflectométrie optique à domaine de temps
GB2235284A (en) * 1989-03-23 1991-02-27 Jeremy Kenneth Arthur Everard Optical spectrum analyser
GB2243210A (en) * 1989-08-30 1991-10-23 Jeremy Kenneth Arthur Everard Distributed optical fibre sensor
CH679184A5 (fr) * 1989-10-17 1991-12-31 Leica Aarau Ag
US5356220A (en) * 1992-05-29 1994-10-18 Kawasaki Steel Corporation Method and apparatus for monitoring temperature of blast furnace and temperature control system using temperature monitoring apparatus
FR2710150B1 (fr) * 1993-09-17 1995-11-17 Cortaillod Cables Sa Procédé de mesure de la diffusion Brillouin dans une fibre optique et dispositif de mise en Óoeuvre de ce procédé.
RU2115245C1 (ru) * 1993-12-15 1998-07-10 Сименс АГ Способ контроля оптических широкополосных соединительных линий вплоть до пассивного стыка
GB2292495B (en) * 1994-08-17 1998-03-25 Northern Telecom Ltd Fault location in optical communication systems
JP3534550B2 (ja) * 1995-11-01 2004-06-07 住友電気工業株式会社 Ｏｔｄｒ装置
GB9710057D0 (en) 1997-05-19 1997-07-09 King S College London Distributed sensing system
US6813403B2 (en) * 2002-03-14 2004-11-02 Fiber Optic Systems Technology, Inc. Monitoring of large structures using brillouin spectrum analysis
DE10307542A1 (de) * 2002-11-27 2004-06-17 Fibotec Fiberoptics Gmbh Verfahren und Anordnung zur Ermittlung von Verluststellen in optischen Fasern
EP1604174B1 (fr) * 2003-02-12 2010-07-21 Sensornet Limited Procede et dispositif de production et d'emission d'impulsions optiques de haute energie pour mesures de grandes distances
GB0303155D0 (en) * 2003-02-12 2003-03-19 Sensornet Ltd Distributed sensor
GB2400906B (en) * 2003-04-24 2006-09-20 Sensor Highway Ltd Distributed optical fibre measurements
GB2401738A (en) * 2003-05-16 2004-11-17 Radiodetection Ltd Optical fibre sensor
DE102004015945B3 (de) * 2004-03-25 2005-12-29 Ufz-Umweltforschungszentrum Leipzig-Halle Gmbh Verfahren und Vorrichtung zur Bestimmung der Temperatur eines Mediums
GB2414543B (en) 2004-05-25 2009-06-03 Polarmetrix Ltd Method and apparatus for detecting pressure distribution in fluids
WO2006002689A1 (fr) * 2004-07-07 2006-01-12 Agilent Technologies, Inc. Systeme de reflectometrie de domaine temporel optique a differentes longueurs d'onde
US7030971B1 (en) * 2004-08-06 2006-04-18 The United States Of America Represented By The Secretary Of The Navy Natural fiber span reflectometer providing a virtual signal sensing array capability
GB0424305D0 (en) * 2004-11-03 2004-12-01 Polarmetrix Ltd Phase-disturbance location and measurement in optical-fibre interferometric reflectometry
US8077314B2 (en) 2007-10-15 2011-12-13 Schlumberger Technology Corporation Measuring a characteristic of a multimode optical fiber
DE102009020115B4 (de) * 2009-05-06 2013-07-18 Bundesanstalt für Materialforschung und -Prüfung (BAM) Fehlerkorrekturverfahren für einen faseroptischen Sensor und Meßvorrichtung
US9546915B2 (en) * 2011-10-12 2017-01-17 Baker Hughes Incorporated Enhancing functionality of reflectometry based systems using parallel mixing operations
US8818199B2 (en) * 2012-02-06 2014-08-26 Adtran, Inc. Correlation systems and methods with error compensation
USRE49680E1 (en) 2013-08-12 2023-10-03 Adelos, Llc Systems and methods for spread spectrum distributed acoustic sensor monitoring
WO2016033192A1 (fr) 2014-08-28 2016-03-03 Adelos, Inc. Gestion de bruit pour interférométrie optique à retard temporel
GB201515505D0 (en) 2015-09-01 2015-10-14 Optasense Holdings Ltd Distributed fibre optic sensing
GB202001356D0 (en) 2020-01-31 2020-03-18 Fotech Group Ltd Distributed optical fibre sensor
CN113252599B (zh) * 2021-06-16 2025-07-25 青岛青源峰达太赫兹科技有限公司 一种实现超长倍频扫描的tds系统
AU2021470494A1 (en) 2021-10-18 2024-03-21 Omnisens Sa Method and device for measuring a temperature and/or a strain in an optical fiber

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042165A (en) * 1979-02-08 1980-09-17 Felten & Guilleaume Carlswerk Improvements in or relating to methods of and circuit arrangements for measuring the attenuation of optical fibers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042165A (en) * 1979-02-08 1980-09-17 Felten & Guilleaume Carlswerk Improvements in or relating to methods of and circuit arrangements for measuring the attenuation of optical fibers

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Journal of Lightwave Technology, Volume LT-3, No. 4, August 1985, IEEE, (New York, US), P. HEALEY: "Review of Long Wavelength Single-Mode Optical Fiber Reflectometry Techniques", pages 876-886 see the whole document and in particular page 883, right-hand column, section 2 *
Journal of Physics E. Scientific Instruments, Volume 19, No. 5, May 1986, The Institute of Physics, (Bristol, GB) P. HEALEY: "Instrumentation Principles for Optical Time Domain Reflectometry", pages 334-341 see the whole document and in particular section 3.1.3 *
Proceedings of the 10th European Conference on Optical Communication, Stuttgart, 3-6 September 1984, H. HAUPT, (Amsterdam, NL) J.J. BERNARD et al.: "Field Portable Reflectometer for Single-Mode Fiber Cables", pages 84-85 see page 84, right-hand column, section 2; figure 1 *

Also Published As

Publication number Publication date
GB8611405D0 (en) 1986-06-18
WO1987007014A2 (fr) 1987-11-19
GB2190186A (en) 1987-11-11
GB2190186B (en) 1990-12-19

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