JP6972018B2 - 安全性のためのマルチコア光ファイバ内の冗長コア - Google Patents
安全性のためのマルチコア光ファイバ内の冗長コア Download PDFInfo
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- 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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- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
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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
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- 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
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G—PHYSICS
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- G02B6/02295—Microstructured optical fibre
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- Length Measuring Devices By Optical Means (AREA)
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Description
この出願は、2016年5月11日に出願された「REDUNDANT CORE IN MULTICORE OPTICAL FIBER FOR SAFETY」という名称の米国仮特許出願第62/334,649号の優先権及び利益を主張し、その全文を本明細書中に参照として援用する。
紡糸マルチコアファイバ(spun multicore fiber)が、光ファイバの形状を決定するために使用されている。4つのコアを有するマルチコアファイバを使用して、ファイバの変形を2つの曲げ角度(ピッチ及びヨー)、1つの捩れ角度、及びファイバの伸びに分離することができる。これらの4つの測定値は、4つの自由度を構成する。これらの4つの測定値(ピッチ、ヨー、捩れ、及び伸び)は、比較的小さな力でファイバに起こり得る変形の全ても表す。
干渉検出回路構成を使用して、光ファイバが感知位置にあるときに、複数の一次コア及び補助コアの各々と関連付けられる測定値干渉パターンデータを検出すること、
データ処理回路構成を使用して、複数の一次コアについての検出される測定値干渉パターンデータに基づいて、複数の一次コアの較正構成と複数の一次コアの実際の構成との間の変動を補償する補償パラメータを決定すること、
補助コアについての予測されるパラメータ値を補助コアについての測定値ベースのパラメータ値と比較して比較を生成すること、
比較に基づいて補償パラメータの不信頼性を決定すること、及び
不信頼性に応答して表示する信号を生成することを含む。
中心コアと、各々が中心コアから半径距離にある4つ又はそれよりも多くの周辺コアとを含む、5つ又はそれよりも多くのコアを備える、光ファイバを含む。5つのコアのうちの1つ又はそれよりも多くのコアは、他のコアの温度応答と異なる温度応答をもたらす。4つ又はそれよりも多くの周辺コアのうちの1つ又はそれよりも多くの周辺コアは、他の4つ又はそれより多くの周辺コアと関連付けられる中心コアからの第2の半径距離とは異なる、中心コアからの第1の半径距離にある。第1の半径距離と第2の半径距離との間の差は、5つ又はそれよりも多くのコアの全てと関連付けられる平均半径距離の少なくとも10%にある。
core”)と呼ぶ。幾つかのパラメータは、このコアbに関して表され、この文書の残部分に関して、指数n=1で特定されるコアは、一例として、基準コアとしての機能を果たすことに留意のこと。2つのパラメータは、コアの位置、即ち、ファイバ中心からの径方向距離r、及び基準コアと交差する確立された垂直軸から測定される任意の角度を記述する。ファイバが曲げられると、所与のコアにおける曲げ誘起ひずみの量は、コアが曲げ平面から分離される垂直距離dに正比例する。これは、外側コアcの指数n=2についての右側の図面に例示されている。曲げ平面が角度θによって記述されるならば、ファイバ内のコアの螺旋状の巻き付け(helical wrapping)の性質を決定されることがある。ファイバの長さに沿う距離に従って、θは螺旋ファイバの回転周波数(spin frequency)によって定められる。
温度はコアの見かけの長さを変化させることもでき、システムにおける第5の「自由度」を表す。多くの形状感知システムは、ファイバの長さに沿う温度変化とファイバの長さに沿う軸方向ひずみ変化とを区別しない。
Claims (17)
- 光ファイバを測定する干渉測定システムであって、
前記光ファイバは、前記光ファイバ内に構成される複数の一次コアと、前記光ファイバ内に構成される補助コアとを含み、
当該干渉測定システムは、
前記複数の一次コア及び前記補助コアの各々と関連付けられる測定値干渉パターンデータを検出するように構成される干渉検出回路構成と、
データ処理回路構成とを含み、
該データ処理回路構成は、
前記複数の一次コアについての前記検出される測定値干渉パターンデータに基づいて、前記複数の一次コアの最適な構成と前記複数の一次コアの実際の構成との間の変動を補償する補償パラメータを決定し、
前記複数の一次コアについてのパラメータ値によって予測される前記補助コアについてのパラメータ値を前記補助コアについての測定値ベースのパラメータ値と比較して、比較値を生成し、
該比較値に基づいて、前記決定される補償パラメータの不信頼性を決定し、且つ
該不信頼性に応答して信号を生成する、
ように構成される、
干渉測定システム。 - 前記信号は、(a)前記干渉検出回路構成又は前記データ処理回路構成の動作における誤差、(b)光ファイバ接続における誤差、(c)前記最適な構成における誤差、又は(d)補償パラメータが前記データ処理回路構成によって決定されない前記光ファイバによって受ける力によって引き起こされる誤差を含む、誤差を表す、請求項1に記載の干渉測定システム。
- 前記誤差は、前記光ファイバの締付け又は温度変化によって引き起こされる、請求項2に記載の干渉測定システム。
- 前記データ処理回路構成は、前記光ファイバについて引き続き得られる測定値干渉パターンデータに前記補償パラメータを適用するように更に構成される、請求項1乃至3のうちのいずれか1項に記載の干渉測定システム。
- 前記予測されるパラメータ値は、前記補助コアについての予測される位相であり、前記測定値ベースのパラメータ値は、前記補助コアについての測定値ベースの位相である、請求項1乃至4のうちのいずれか1項に記載の干渉測定システム。
- 前記データ処理回路構成は、
前記複数の一次コアの各々において測定される位相の導関数を計算して、複数の位相導関数を取得し、
変換行列によって前記複数の位相導関数を乗じて、予測される補助コアの位相導関数を取得し、且つ
該予測される補助コアの位相導関数を積分して、前記補助コアについての前記予測される位相を取得することによって、
前記補助コアについての前記予測される位相を決定するように更に構成される、
請求項5に記載の干渉測定システム。 - 前記データ処理回路構成は、
前記検出される測定値干渉パターンデータに基づいて、前記光ファイバ上の捩れひずみ、曲げひずみ、及び軸方向ひずみに対応する、前記光ファイバについてのひずみ値を決定し、且つ
前記光ファイバについての前記ひずみ値に基づいて、前記光ファイバの形状を決定する、
ように更に構成される、
請求項1乃至6のうちのいずれか1項に記載の干渉測定システム。 - 前記データ処理回路構成は、前記不信頼性が所定の閾値を超えるときに、前記信号を生成するように更に構成される、請求項1乃至7のうちのいずれか1項に記載の干渉測定システム。
- 前記信号は、前記不信頼性を表す、請求項1乃至8のうちのいずれか1項に記載の干渉測定システム。
- 光ファイバを測定する干渉測定方法であって、
前記光ファイバは、前記光ファイバ内に構成される複数の一次コアと、前記光ファイバ内に構成される補助コアとを含み、
当該干渉測定方法は、
干渉検出回路構成を使用して、前記光ファイバが感知位置にあるときに、前記複数の一次コア及び前記補助コアの各々と関連付けられる測定値干渉パターンデータを検出するステップと、
データ処理回路構成を使用して、前記複数の一次コアについての前記検出される測定値干渉パターンデータに基づいて、前記複数の一次コアの最適な構成と前記複数の一次コアの実際の構成との間の変動を補償する補償パラメータを決定するステップと、
前記複数の一次コアについてのパラメータ値によって予測される前記補助コアについてのパラメータ値を前記補助コアについての測定値ベースのパラメータ値と比較して、比較値を生成するステップと、
該比較値に基づいて、前記補償パラメータの不信頼性を決定するステップと、
該不信頼性に応答して表示する信号を生成するステップとを含む、
干渉測定方法。 - 前記光ファイバについて引き続き得られる測定値干渉パターンデータに前記補償パラメータを適用するステップを更に含む、請求項10に記載の干渉測定方法。
- 前記検出される測定値干渉パターンデータに基づいて、前記光ファイバ上の捩れひずみ、曲げひずみ、及び軸方向ひずみに対応する、前記光ファイバについてのひずみ値を決定するステップと、
該ひずみ値に基づいて、前記光ファイバの形状を決定するステップとを更に含む、
請求項10又は11に記載の干渉測定方法。 - 前記不信頼性に応答して表示する前記信号を生成するステップは、
前記不信頼性が所定の閾値を超えるときに、前記信号を生成するステップを含む、
請求項12に記載の干渉測定方法。 - 複数のコアを含む、光ファイバであって、
前記複数のコアは、
中心コアと、
複数の周辺コアとを含み、
該複数の周辺コアは、4つ又はそれよりも多くの周辺コアを含み、前記複数の周辺コアの各周辺コアは、前記中心コアからそれぞれの半径距離にあり、
前記複数のコアのうちの1つ又はそれよりも多くのコアは、前記複数のコアのうちの残余のコアの温度応答とは異なる温度応答をもたらし、
前記複数の周辺コアのうちの1つ又はそれよりも多くの周辺コアは、前記中心コアから第1の半径距離にあり、前記複数の周辺コアのうちの残余の周辺コアは、前記中心コアから第2の半径距離にあり、
前記複数の周辺コアは、前記中心コアからの平均半径距離を有し、前記第1の半径距離と前記第2の半径距離との間の差が前記平均半径距離の少なくとも10%にある、
光ファイバ。 - 前記複数の周辺コアは、前記光ファイバの長さに沿って螺旋状に撚り合わされる、請求項14に記載の光ファイバ。
- 複数の機械可読命令を含む、非一時的な機械可読媒体であって、
前記複数の機械可読命令は、干渉測定システムと関連付けられる1つ又はそれよりも多くのプロセッサによって実行されるときに、該1つ又はそれよりも多くのプロセッサに、複数の一次コアと補助コアとを含む光ファイバを測定する方法を行わせ、
該方法は、
干渉検出回路構成を使用して、前記複数の一次コア及び前記補助コアの各々と関連付けられる測定値干渉パターンデータを検出するステップと、
データ処理回路構成を使用して、前記複数の一次コアについての前記検出される測定値干渉パターンデータに基づいて、前記複数の一次コアの最適な構成と前記複数の一次コアの実際の構成との間の変動を補償する補償パラメータを決定するステップと、
前記複数の一次コアについてのパラメータ値によって予測される前記補助コアについてのパラメータ値を前記補助コアについての測定値ベースのパラメータ値と比較して、比較値を生成するステップと、
該比較値に基づいて、前記補償パラメータの不信頼性を決定するステップと、
該不信頼性に応答して表示する信号を生成するステップとを含む
非一時的な機械可読媒体。 - 当該方法は、
前記光ファイバについて引き続き得られる測定値干渉パターンデータに前記補償パラメータを適用するステップと、
前記検出される測定値干渉パターンデータに基づいて、前記光ファイバ上の捩れひずみ、曲げひずみ、及び軸方向ひずみに対応する、前記光ファイバについてのひずみ値を決定するステップと、
該ひずみ値に基づいて、前記光ファイバの形状を決定するステップとを更に含む、
請求項16に記載の非一時的な機械可読媒体。
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