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1. WO2020070229 - DISTRIBUTED SENSING APPARATUS

Publication Number WO/2020/070229
Publication Date 09.04.2020
International Application No. PCT/EP2019/076777
International Filing Date 02.10.2019
IPC
G01D 5/353 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical 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
26using optical means, i.e. using infra-red, visible or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
353influencing the transmission properties of an optical fibre
CPC
G01D 5/35303
GPHYSICS
01MEASURING; TESTING
DMEASURING 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
5Mechanical 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
26characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
353influencing the transmission properties of an optical fibre
35303using a reference fibre, e.g. interferometric devices
G01D 5/35358
GPHYSICS
01MEASURING; TESTING
DMEASURING 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
5Mechanical 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
26characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
353influencing the transmission properties of an optical fibre
35338using other arrangements than interferometer arrangements
35354Sensor working in reflection
35358using Backscattering to detect the measured quantity
H04B 10/071
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
071using a reflected signal, e.g. using optical time-domain reflectometers [OTDRs]
Applicants
  • NKT PHOTONICS GMBH [DE]/[DE]
Inventors
  • JOSTMEIER, Thorben
  • MARX, Benjamin
  • RATH, Alexander
  • HILL, Wieland
Agents
  • RICHARD KENNEDY
Priority Data
10 2018 124 435.503.10.2018DE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DISTRIBUTED SENSING APPARATUS
(FR) APPAREIL DE DÉTECTION DISTRIBUÉE
Abstract
(EN)
A distributed sensing apparatus based on Optical Time Domain Reflectometry, OTDR, comprises an optical source; an optical splitter in optical communication with the optical source, the optical splitter having first and second outputs; a sensing fibre in optical communication with the first output of the optical splitter; a combining unit arranged to combine a reference signal derived from the second output of the optical splitter with a backscattered signal derived from the sensing fibre, wherein the combining unit comprises one or more 3x3 fused fibre couplers; and a signal processing unit configured for processing information derived from the combining unit so as to provide distributed sensing data. The combining unit comprises a polarization diversity arrangement comprising one or more polarization sensitive elements, configured to align, in the combining unit, the polarization of a first signal derived from the backscattered signal with that of a first signal derived from the reference signal; and the polarization of a second signal derived from the backscattered signal with that of a second signal derived from the reference signal.
(FR)
L'invention concerne un appareil de détection distribuée basé sur la réflectométrie optique dans le domaine temporel (OTDR) qui comprend une source optique ; un diviseur optique en communication optique avec la source optique, le diviseur optique comportant de première et seconde sorties ; une fibre de détection en communication optique avec la première sortie du diviseur optique ; une unité de combinaison conçue pour combiner un signal de référence dérivé de la seconde sortie du diviseur optique avec un signal rétrodiffusé dérivé de la fibre de détection, l'unité de combinaison comprenant un ou plusieurs coupleurs à fibres fusionnées 3x3 ; et une unité de traitement de signal conçue pour traiter des informations dérivées de l'unité de combinaison de façon à fournir des données de détection distribuée. L'unité de combinaison comprend un agencement de diversité de polarisation comportant un ou plusieurs éléments sensibles à la polarisation, conçus pour aligner, dans l'unité de combinaison, la polarisation d'un premier signal dérivé du signal rétrodiffusé avec celle d'un premier signal dérivé du signal de référence ; et la polarisation d'un second signal dérivé du signal rétrodiffusé avec celle d'un second signal dérivé du signal de référence.
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