JP7491458B2 - 電柱位置特定方法及び架空光ファイバケーブルの状態推定方法 - Google Patents
電柱位置特定方法及び架空光ファイバケーブルの状態推定方法 Download PDFInfo
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- JP7491458B2 JP7491458B2 JP2023500173A JP2023500173A JP7491458B2 JP 7491458 B2 JP7491458 B2 JP 7491458B2 JP 2023500173 A JP2023500173 A JP 2023500173A JP 2023500173 A JP2023500173 A JP 2023500173A JP 7491458 B2 JP7491458 B2 JP 7491458B2
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- 239000013307 optical fiber Substances 0.000 title claims description 96
- 238000000034 method Methods 0.000 title claims description 19
- 238000000691 measurement method Methods 0.000 claims description 11
- 230000001902 propagating effect Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- 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
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/48—Overhead installation
- G02B6/483—Installation of aerial type
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- 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
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Locating Faults (AREA)
Description
光ファイバ振動分布測定方法(DAS:Distributed Acoustic Sensor)を利用した電柱位置特定方法を説明する。DASを利用して、光ファイバ距離に対する振動分布パターンから電柱位置を特定したり、架空光ファイバケーブルの架設状態を示す模式図を図1に示す。通信ビルに設置された光ファイバ振動分布測定装置から、光信号を光ケーブルに入力する。光信号は、地下に敷設された光ファイバケーブルから架空に敷設された光ファイバケーブルを伝搬する。伝搬しながら光ファイバ内でレイリー散乱を誘導し、そのうち、光ファイバ振動分布測定装置側に散乱したレイリー散乱光の一部が後方散乱光として戻ってくる。
Δν=-0.78*ε*ν0 (1)
ここで、εは歪量、ν0はプローブ光の中心周波数を表す。
光ファイバ振動分布測定方法(DAS)を利用した架空光ファイバケーブルの状態推定方法を説明する。DASで測定した電柱スパン内の光ファイバ距離に対する歪量を時間ごとに順次積み上げた光ファイバの振動分布パターンの例を図5、図6及び図7に示す。架空光ファイバケーブルは、電柱スパンごとに振動する弦とみなすことができ、振動パターンを測定することで、光ファイバケーブルの敷設状態を推定することができる。
Claims (3)
- 光ファイバ振動分布測定方法で測定した電柱スパン内の光ファイバ距離に対する歪量を時間ごとに順次積み上げた振動分布パターンから、振動が光ファイバに沿って伝搬し、かつ振動の振幅が一様であれば、光ファイバケーブルが正常であると判断する架空光ファイバケーブルの状態推定方法。
- 光ファイバ振動分布測定方法で測定した電柱スパン内の光ファイバ距離に対する歪量を時間ごとに順次積み上げた振動分布パターンから、振動が光ファイバに沿って伝搬し、かつ振動の振幅が一様でなければ、光ファイバケーブルに付着物による荷重があると判断する架空光ファイバケーブルの状態推定方法。
- 光ファイバ振動分布測定方法で測定した電柱スパン内の光ファイバ距離に対する歪量を時間ごとに順次積み上げた振動分布パターンから、振動が光ファイバの途中で停止又は縮小していれば、光ファイバケーブルに地上障害物が接触していると判断する架空光ファイバケーブルの状態推定方法。
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PCT/JP2021/005852 WO2022176047A1 (ja) | 2021-02-17 | 2021-02-17 | 電柱位置特定方法及び架空光ファイバケーブルの状態推定方法 |
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US (1) | US20240118126A1 (ja) |
EP (1) | EP4296633A1 (ja) |
JP (1) | JP7491458B2 (ja) |
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US11881688B2 (en) * | 2021-04-12 | 2024-01-23 | Nec Corporation | Dynamic anomaly localization of utility pole wires |
WO2024057492A1 (ja) * | 2022-09-15 | 2024-03-21 | 日本電信電話株式会社 | 振動分布波形から電柱位置を特定する方法 |
WO2024166295A1 (ja) * | 2023-02-09 | 2024-08-15 | 日本電信電話株式会社 | 設備位置解析装置及び設備位置解析方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US20190284931A1 (en) | 2018-03-13 | 2019-09-19 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ | Method and system for monitoring a material and/or a device in a bore hole using a fiber optic measuring cable |
WO2020044648A1 (ja) | 2018-08-30 | 2020-03-05 | 日本電気株式会社 | 電柱位置特定システム、電柱位置特定装置、電柱位置特定方法、及び非一時的なコンピュータ可読媒体 |
WO2020044660A1 (ja) | 2018-08-30 | 2020-03-05 | 日本電気株式会社 | 状態特定システム、状態特定装置、状態特定方法、及び非一時的なコンピュータ可読媒体 |
CN111442788A (zh) | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | 一种架空输电线路健康监测方法及系统 |
JP2020134142A (ja) | 2019-02-12 | 2020-08-31 | 日本電信電話株式会社 | 架空光ファイバケーブル検査方法、架空光ファイバケーブル検査装置及びプログラム |
US20200370950A1 (en) | 2019-05-22 | 2020-11-26 | Nec Laboratories America, Inc | Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination |
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CN211234916U (zh) * | 2019-12-17 | 2020-08-11 | 国网新疆电力有限公司昌吉供电公司 | 一种基于das与otdr的光缆状态监测系统 |
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- 2021-02-17 EP EP21926487.6A patent/EP4296633A1/en active Pending
- 2021-02-17 WO PCT/JP2021/005852 patent/WO2022176047A1/ja active Application Filing
- 2021-02-17 US US18/275,726 patent/US20240118126A1/en active Pending
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US20190284931A1 (en) | 2018-03-13 | 2019-09-19 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ | Method and system for monitoring a material and/or a device in a bore hole using a fiber optic measuring cable |
WO2020044648A1 (ja) | 2018-08-30 | 2020-03-05 | 日本電気株式会社 | 電柱位置特定システム、電柱位置特定装置、電柱位置特定方法、及び非一時的なコンピュータ可読媒体 |
WO2020044660A1 (ja) | 2018-08-30 | 2020-03-05 | 日本電気株式会社 | 状態特定システム、状態特定装置、状態特定方法、及び非一時的なコンピュータ可読媒体 |
JP2020134142A (ja) | 2019-02-12 | 2020-08-31 | 日本電信電話株式会社 | 架空光ファイバケーブル検査方法、架空光ファイバケーブル検査装置及びプログラム |
US20200370950A1 (en) | 2019-05-22 | 2020-11-26 | Nec Laboratories America, Inc | Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination |
CN111442788A (zh) | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | 一种架空输电线路健康监测方法及系统 |
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JPWO2022176047A1 (ja) | 2022-08-25 |
US20240118126A1 (en) | 2024-04-11 |
WO2022176047A1 (ja) | 2022-08-25 |
CN116917703A (zh) | 2023-10-20 |
EP4296633A1 (en) | 2023-12-27 |
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