JP2017198668A - ブリルアン及びレイリー分布センサ - Google Patents
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- 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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- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
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- G01M11/3172—Reflectometers detecting the back-scattered light in the frequency-domain, e.g. OFDR, FMCW, heterodyne detection
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- G01K11/322—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Brillouin scattering
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Abstract
【解決手段】ブリルアン及びレイリー分布センサは、第1レーザビームを放射する第1レーザ源と、第2レーザビームを放射する第2レーザ源を含み得る。フォトダイオードが両レーザビーム間のビート周波数を取得する。そのビート周波数を用いて2つのレーザビーム間に所定のオフセット周波数シフトを維持することができる。変調器が第1レーザビームを変調する。変調された第1レーザビームは被検査装置(DUT)に注入される。コヒーレント受信機がDUTからの後方散乱信号を収集し得る。後方散乱信号はDUTに注入された変調された第1レーザビームから生じる。コヒーレント受信機は、第2レーザビームを局部発振器として用いて、所定のオフセット周波数シフトに基づいてブリルアン及びレイリートレースを決定することができる。
【選択図】なし
Description
Claims (20)
- 第1レーザビームを放射する第1レーザ源を備え、
第2レーザビームを放射する第2レーザ源を備え、
前記第1レーザビームと前記第2レーザビームとの間のビート周波数を取得するフォトダイオードを備え、ここで、前記ビート周波数は前記第1レーザビームと前記第2レーザビームとの間に所定のオフセット周波数シフトを維持するために使用され、前記所定のオフセット周波数シフトは前記第1レーザビーム又は前記第2レーザビームの何れかの所定の周波数と相対的であり、
前記第1レーザビームを変調する変調器を備え、ここで、変調された第1レーザビームは測定対象物(DUT)に注入されるものであり、且つ
前記DUTからの後方散乱信号を収集するコヒーレント受信機を備え、ここで、前記後方散乱信号は前記DUTに注入された前記変調された第1レーザビームから生じ、前記コヒーレント受信機は、前記第2レーザビームを局部発振器として用いて前記第1レーザビームと前記第2レーザビームとの間の前記所定のオフセット周波数シフトに基づいて前記DUTと関連するブリルアン及びレイリートレースを決定するために使用するものである、
ブリルアン及びレイリー分布センサ。 - 前記ブリルアントレースを決定するための前記所定のオフセット周波数シフトは約10.8GHzである、請求項1記載のブリルアン及びレイリー分布センサ。
- 前記ブリルアントレースを決定するための前記所定のオフセット周波数シフトは約10.0GHz〜約13.0GHzの範囲内から選択される、請求項1記載のブリルアン及びレイリー分布センサ。
- 前記レイリートレースを決定するための前記所定のオフセット周波数シフトは約100.0KHz〜約1.0GHzの範囲内から選択される、請求項1記載のブリルアン及びレイリー分布センサ。
- 前記DUTは光ファイバである、請求項1記載のブリルアン及びレイリー分布センサ。
- 前記コヒーレント受信機は、前記後方散乱信号を受信し、前記後方散乱信号を2つの異なる偏光状態に分割する偏光ビームスプリッタ(PBS)を更に備え、ここで、
前記DUTと関連する前記ブリルアン及びレイリートレースを決定するために、前記後方散乱信号の第1偏光状態に対応する分割部分が第1偏光状態の前記第2レーザビームと混合され、且つ前記後方散乱信号の第2偏光状態に対応する分割部分が第2偏光状態の前記第2レーザビームと混合される、
請求項1記載のブリルアン及びレイリー分布センサ。 - 第1レーザビームと第2レーザビームの間に所定のオフセット周波数シフトを維持するステップで、前記所定のオフセット周波数シフトは前記第1レーザビーム又は前記第2レーザビームの何れかの所定の周波数と相対的である、ステップと、
前記第1レーザビームを変調するステップで、変調された第1レーザビームは測定対象物(DUT)に注入される、ステップと、
前記DUTから後方散乱信号を収集するステップで、前記後方散乱信号は前記DUTに注入された前記変調された第1レーザビームから生じ、前記第2レーザビームは局部発振器として使用される、ステップと、
前記DUTから収集した後方散乱信号に基づいて、前記DUTのブリルアントレースを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項7記載の方法において、更に、
前記DUTからの前記後方散乱信号の収集を複数の周波数シフトに対して反復するステップと、
前記複数の周波数シフトに対応する前記反復収集及び前記DUTからの後方散乱信号の収集に基づいて、分布ブリルアンスペクトルをサンプリングするステップと、
前記分布ブリルアンスペクトルのサンプリングに基づいて、前記DUTに沿う共振ブリルアン周波数シフトを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項8記載の方法において、更に、
前記共振ブリルアン周波数シフトに対して積分処理を実行することによって、前記分布ブリルアンスペクトルのサンプリングに基づいて、積分ブリルアンパワーを決定するステップ、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項7記載の方法において、更に、
前記第1レーザビーム及び前記第2レーザビームを前記2つのレーザビームの間に異なる所定のオフセット周波数シフトを維持した状態で波長範囲に亘ってスキャンするステップと、
前記異なる所定のオフセット周波数シフトと関連する前記第1レーザビームを更に変調するステップで、更に変調された第1レーザ信号は前記DUTに注入されるステップと、
前記DUTからの更なる後方散乱信号を更に収集するステップで、前記更なる後方散乱信号は前記DUTに注入された前記更に変調された第1レーザビームに基づくものであり、前記第2レーザビームが前記局部発振器として使用される、ステップと、
前記DUTからの前記更なる収集後方散乱信号に基づいて、前記DUTのレイリートレースを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項9記載の方法において、更に、
前記第1レーザビーム及び前記第2レーザビームを前記2つのレーザビームの間に異なる所定のオフセット周波数シフトを維持した状態で波長範囲に亘ってスキャンするステップと、
前記異なる所定のオフセット周波数シフトと関連する前記第1レーザビームを更に変調するステップで、更に変調された第1レーザ信号は前記DUTに注入されるステップと、
前記DUTからの更なる後方散乱信号を更に収集するステップで、前記更なる後方散乱信号は前記DUTに注入された前記更に変調された第1レーザビームに起因し、前記第2レーザビームが前記局部発振器として使用される、ステップと、
前記DUTからの前記更なる収集後方散乱信号に基づいて、前記DUTのレイリートレースを決定するステップで、前記レイリートレースは前記DUTに沿うレイリーパワー対時間又は距離を表す、ステップと、
前記DUTに沿う前記積分ブリルアンパワー、前記レイリーパワー及び前記共振ブリルアン周波数シフトに基づいて、前記DUTと関連する温度及び歪みを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項7記載の方法において、前記DUTは光ファイバである、ブリルアントレース及びレイリートレースを決定する方法。
- 請求項7記載の方法において、前記ブリルアントレースを決定するための前記所定のオフセット周波数シフトは約10.8GHzである、ブリルアントレース及びレイリートレースを決定する方法。
- 請求項7記載の方法において、前記ブリルアントレースを決定するための前記所定のオフセット周波数シフトは約10.0GHz〜約13.0GHzの範囲内から選択される、ブリルアントレース及びレイリートレースを決定する方法。
- 第1レーザビーム及び第2レーザビームを前記2つのレーザビームの間に所定のオフセット周波数シフトを維持した状態で波長範囲に亘ってスキャンするステップで、前記所定のオフセット周波数シフトは前記第1レーザビーム又は前記第2レーザビームの何れかの所定の周波数と相対的である、ステップと、
前記第1レーザビームを変調するステップで、変調された第1レーザビームは測定対象物(DUT)に注入される、ステップと、
前記DUTからの後方散乱信号を収集するステップで、前記後方散乱信号は前記DUTに注入された前記変調された第1レーザビームから生じ、前記第2レーザビームが前記局部発振器として使用される、ステップと、
前記DUTからの前記収集後方散乱信号に基づいて、前記DUTのレイリートレースを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項15記載の方法において、更に、
前記DUTからの前記後方散乱信号の収集を前記所定のオフセット周波数シフトに対して反復するステップと、
前記第1レーザビーム及び前記第2レーザビームを前記2つのレーザビームの間に所定のオフセット周波数シフトを維持した状態で波長範囲に亘ってスキャンする間、前記所定のオフセット周波数シフトに対して反復された前記DUTからの前記後方散乱信号の収集を平均化してコヒーレントフェージング雑音を低減するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項15記載の方法において、前記所定のオフセット周波数シフトは約100.0KHz〜約1.0GHzの範囲から選択される、ブリルアントレース及びレイリートレースを決定する方法。
- 請求項15記載の方法において、前記DUTは光ファイバである、ブリルアントレース及びレイリートレースを決定する方法。
- 請求項15記載の方法において、更に、
前記第1レーザビームと前記第2レーザビームの間に異なる所定のオフセット周波数を維持するステップと、
前記異なる所定のオフセット周波数シフトと関連する前記第1レーザビームを更に変調するステップで、更に変調された第1レーザ信号は前記DUTに注入されるステップと、
前記DUTからの更なる後方散乱信号を更に収集するステップで、前記更なる後方散乱信号は前記DUTに注入された前記更に変調された第1レーザビームから生じ、前記第2レーザビームが前記局部発振器として使用される、ステップと、
前記DUTからの前記更なる収集後方散乱信号に基づいて、前記DUTのレイリートレースを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。 - 請求項19記載の方法において、前記レイリートレースは前記DUTに沿うレイリーパワー対時間又は距離を表し、更に、
前記ブリルアントレースに基づいて、前記DUTと関連するブリルアンパワーを決定するステップと、
前記DUTと関連するパワー変動を除去するために前記ブリルアンパワーを前記レイリーパワーに対して正規化するステップと、
前記正規化したブリルアンパワー及び前記DUTに沿う共振ブリルアン周波数シフトに基づいて、前記DUTと関連する温度及び歪みを決定するステップと、
を備える、ブリルアントレース及びレイリートレースを決定する方法。
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