WO1987007014A3 - Greatly enhanced spatial detection of optical backscatter for sensor applications - Google Patents

Greatly enhanced spatial detection of optical backscatter for sensor applications 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
Application number
PCT/GB1987/000301
Other languages
French (fr)
Other versions
WO1987007014A2 (en
Inventor
Jeremy Kenneth Arthur Everard
Original Assignee
Jeremy Kenneth Arthur Everard
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 Jeremy Kenneth Arthur Everard filed Critical Jeremy Kenneth Arthur Everard
Publication of WO1987007014A2 publication Critical patent/WO1987007014A2/en
Publication of WO1987007014A3 publication Critical patent/WO1987007014A3/en

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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

Abstract

A pseudo random bit sequence is amplitude modulated onto a light source (2) (other types of modulation are discussed in the specification) and this modulated beam is transmitted down an optical fibre (3) or any material and the detected backscatted signal is multiplied (9) with a digitally delayed reference version of the transmitted sequence. By varying the delay between the transmitted and the reference pseudo random sequence spatial information can be recovered with improved signal to noise ratios compared to conventional Optical Time Domain Reflectometry. This enables improvements in the detected signal to noise ratio of the backscatter allowing reduced signal averaging times or reduced peak transmitted power. This technique can be used to produce enhanced optical sensors, sensing any external parameter on which the backscatter is dependent using video, and coherent detection. Enhanced fibre loss measurement techniques and enhanced fibre discontinuity measurement techniques are described. Distributed temperature sensors are described using Billouin and Raman backscatter. Because of enhanced detection the spatial resolution for a given signal averaging time can be reduced. The measurement of the amplitude, spectra, phase and polarisation of the scatter can also be used to characterise the properties of the material and the influence of any external parameters which influence the properties of the materials producing the backscatter. The measurement of backscatter can therefore be used to measure any external measurand which influences the amplitude, frequency, phase and polarisation of the backscatter.
PCT/GB1987/000301 1986-05-09 1987-05-07 Greatly enhanced spatial detection of optical backscatter for sensor applications WO1987007014A2 (en)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=10597631

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000301 WO1987007014A2 (en) 1986-05-09 1987-05-07 Greatly enhanced spatial detection of optical backscatter for sensor applications

Country Status (2)

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

Families Citing this family (30)

* 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
DE68907886T2 (en) * 1989-01-24 1994-01-13 Hewlett Packard Gmbh Method and device for using optical time domain reflectometers.
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 (en) * 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 (en) * 1993-09-17 1995-11-17 Cortaillod Cables Sa Method for measuring Brillouin scattering in an optical fiber and device for implementing this method.
CA2178952A1 (en) * 1993-12-15 1995-06-22 Frowin Derr Surveillance of optical broad-band connection lines up to a passive interface
GB2292495B (en) * 1994-08-17 1998-03-25 Northern Telecom Ltd Fault location in optical communication systems
JP3534550B2 (en) * 1995-11-01 2004-06-07 住友電気工業株式会社 OTDR device
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 (en) * 2002-11-27 2004-06-17 Fibotec Fiberoptics Gmbh Determining optical fiber defect locations involves emitting light pulses while simultaneously feeding pulses into shift register for simultaneous comparison of sub-patterns after each register stage
WO2004073172A2 (en) * 2003-02-12 2004-08-26 Sensornet Limited Method and apparatus for generation and transmission of high energy optical pulses for long range measurements
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 (en) * 2004-03-25 2005-12-29 Ufz-Umweltforschungszentrum Leipzig-Halle Gmbh Determining the temperature of a medium comprises coupling electromagnetic radiation with a Raman-active substance via an optical fiber, arranging the Raman-active substance in the medium and further processing
GB2414543B (en) * 2004-05-25 2009-06-03 Polarmetrix Ltd Method and apparatus for detecting pressure distribution in fluids
WO2006002689A1 (en) * 2004-07-07 2006-01-12 Agilent Technologies, Inc. Optical time domain reflectometry system at different wavelengths
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 (en) * 2009-05-06 2013-07-18 Bundesanstalt für Materialforschung und -Prüfung (BAM) Error correction method for a fiber optic sensor and measuring device
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
WO2015023255A1 (en) 2013-08-12 2015-02-19 Halliburton Energy Services, Inc Systems and methods for spread spectrum distributed acoustic sensor monitoring
WO2016033192A1 (en) 2014-08-28 2016-03-03 Adelos, Inc. Noise management for optical time delay interferometry
GB201515505D0 (en) 2015-09-01 2015-10-14 Optasense Holdings Ltd Distributed fibre optic sensing
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
WO1987007014A2 (en) 1987-11-19
GB8611405D0 (en) 1986-06-18
GB2190186B (en) 1990-12-19
GB2190186A (en) 1987-11-11

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