JP2019507327A - 周波数合成に基づいた光周波数領域反射方法及びシステム - Google Patents
周波数合成に基づいた光周波数領域反射方法及びシステム Download PDFInfo
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- 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
- G01D5/35306—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 an interferometer arrangement
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- 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
- G01D5/35306—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 an interferometer arrangement
- G01D5/35335—Aspects of emitters or receivers used by an interferometer in an optical fibre sensor arrangement
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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
- G01D5/35361—Sensor working in reflection using backscattering to detect the measured quantity using elastic backscattering to detect the measured quantity, e.g. using Rayleigh backscattering
Abstract
Description
図1に示すように、本実施例は、測定光ファイバ9、信号発生モジュール、順に接続される狭線幅レーザ光源モジュール、光コム生成モジュール、掃引パルスカットモジュール、コヒーレント受信モジュール、光電変換モジュール及びデジタル信号処理モジュールを有し、コヒーレント受信モジュールは測定光ファイバ9に接続されている。
Claims (13)
- ローカル光を電気光学変調及び音響光学変調することで光パルスを取得し、これを検出パルス光信号として測定光ファイバに入力し、取得したレイリー後方散乱光信号をローカル光とコヒーレント検出させた後に光電変換及び復調することにより、光周波数反射計を実現する、周波数合成に基づいた光周波数領域反射方法であって、
電気光学変調では単一周波数信号を用いて変調し、音響光学変調ではパルス信号を用いて変調し、且つ電気光学変調により得られた光コム信号の複数の周波数成分を同時に掃引することにより、光パルスを取得することを特徴とする周波数合成に基づいた光周波数領域反射方法。 - 前記ローカル光が狭線幅レーザ光であり、前記パルス信号がチャープパルス信号であることを特徴とする請求項1に記載の周波数合成に基づいた光周波数領域反射方法。
- 前記光コム信号の周波数間隔がパルス信号の掃引範囲に等しいことを特徴とする請求項1に記載の周波数合成に基づいた光周波数領域反射方法。
- 前記電気光学変調とは、高周波の正弦波電気信号を強度変調又は位相変調方式で単一周波数の光信号に変調して、光周波数コム信号を生成することであることを特徴とする請求項1に記載の周波数合成に基づいた光周波数領域反射方法。
- 前記音響光学変調とは、パルス信号で光コム信号を変調することにより、複数周波数の掃引光パルス信号を取得することであることを特徴とする請求項1に記載の周波数合成に基づいた光周波数領域反射方法。
- 前記復調とは、
光電変換で取得した電気信号に基づいて、その周波数成分の数と同じセグメント数のデジタル掃引信号を生成し、
生成した複数セグメントの複素信号に窓関数をそれぞれ乗じるとともに、元データとそれぞれ相互相関演算することにより、対応する相関関数を取得し、
取得した複数の複素関数をそのまま加算してモジュロを求め、複数セグメントのデジタル掃引信号を合成した復調結果を取得することであることを特徴とする請求項1に記載の周波数合成に基づいた光周波数領域反射方法。 - 前記窓関数が、ハニング窓関数であることを特徴とする請求項6に記載の周波数合成に基づいた光周波数領域反射方法。
- 参照光分岐路、これと同一光源の変調光分岐路、カップリングユニット及び復調ユニットを有し、参照光分岐路と変調光分岐路の出力端がいずれもカップリングユニットに接続され、カップリングユニットの出力端が復調ユニットに接続された周波数合成に基づいた光周波数領域反射システムであって、
前記変調光分岐路が、順に直列に接続される電気光学変調器、音響光学変調器、エルビウムドープ光ファイバ増幅器、光サーキュレータ及び測定光ファイバを有し、電気光学変調器が単一周波数信号で変調することで光コム信号を生成し、音響光学変調器に入力された光コム信号がパルス信号変調で複数周波数の掃引光パルス信号を取得し、且つエルビウムドープ光ファイバ増幅器にて増幅された後に光サーキュレータ及び測定光ファイバに順に出力され、光サーキュレータの反射端が変調光分岐路の出力端としてカップリングユニットに接続されたことを特徴とする周波数合成に基づいた光周波数領域反射システム。 - 前記参照光分岐路及び変調光分岐路の入力端が同一レーザ装置からの狭線幅レーザ光を受取り、当該レーザ装置が光ファイバカプラを経由して、狭線幅レーザ光を99:1の分光比率で変調光分岐路と参照光分岐路にそれぞれ出力することを特徴とする請求項8に記載の周波数合成に基づいた光周波数領域反射システム。
- 前記参照光分岐路には偏波制御器が設けられていることを特徴とする請求項8に記載の周波数合成に基づいた光周波数領域反射システム。
- 前記電気光学変調器が電気光学強度変調器又は電気光学位相変調器であることを特徴とする請求項8に記載の周波数合成に基づいた光周波数領域反射システム。
- 前記カップリングユニットには50:50光ファイバカプラが用いられ、参照光分岐路からのローカル光と光ファイバサーキュレータから出力されたレイリー後方散乱光が、50:50光ファイバカプラでコヒーレント検出されることを特徴とする請求項8に記載の周波数合成に基づいた光周波数領域反射システム。
- 前記復調ユニットが光電変換モジュール、データ収集ボード及び復調モジュールを有し、データ収集ボードが光電変換モジュールで変換された電気信号を収集して、復調モジュールが復調することを特徴とする請求項8に記載の周波数合成に基づいた光周波数領域反射システム。
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CN103984184B (zh) * | 2014-05-19 | 2016-08-24 | 上海交通大学 | 光脉冲压缩反射装置 |
WO2016033192A1 (en) * | 2014-08-28 | 2016-03-03 | Adelos, Inc. | Noise management for optical time delay interferometry |
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CN105067103B (zh) * | 2015-08-31 | 2018-01-02 | 上海交通大学 | 基于光频域反射计的振动检测装置及其方法 |
CN105490738B (zh) * | 2016-01-05 | 2017-10-03 | 上海交通大学 | 基于频率合成的光频域反射方法及系统 |
CN205453695U (zh) | 2016-01-05 | 2016-08-10 | 上海交通大学 | 基于频率合成的光频域反射装置 |
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