JP2014500497A - Dfbファイバレーザ曲げセンサ、および光ヘテロダインマイクロフォン - Google Patents
Dfbファイバレーザ曲げセンサ、および光ヘテロダインマイクロフォン Download PDFInfo
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- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
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- General Physics & Mathematics (AREA)
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- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
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Abstract
Description
本出願は2010年12月2日に出願された米国仮出願特許番号No.61/419,247の利得を請求し、そのすべてが参照のため、ここに引用される。
実験は図1に示される実験の設定を用いて実行された。ここで、ポンプレーザ102により976nmでポンプされた、Erをドープした分布帰還型(DFB)ファイバレーザ101が曲げのセンサとして使用された。Yb、Nd、Tm、Cr、あるいは類似のものなど、いずれかの利得媒体が使用できる。DFBレーザは二つの回転可能なファイバホルダ103、および104を用いて保持され、それらの間の間隔は機械的な並進台を用いて調整可能にした。さらに、二つの波長分割多重装置(WDM)105、および106がポンプ信号から出力信号を分離するための結合器として使用された。DFBレーザは並進台を用いてファイバのホルダをより近くに移動させることにより単純に曲げられた。この設定は、1)DFBレーザの何らかのねじれを除去する、あるいは2)一つのホルダを他方のホルダに相対的に回転することによって意図的にねじれを加えることも可能にした。さらに、ねじられていないDFBレーザの曲げの面を、(図1には示されない)狭い板状のガイドを用いてある方向(例えば、水平面)に限定することにより、偏光の軸(低速、あるいは高速)の傾きの角度θsが曲げ平面に対して変化させられた。ファイバの直交する複屈折軸の曲げの面に対する方向が図2に図解される。
Δν = 969.8 − 0.214T + 591.4*(1/R)2
λ = 1545.6 + 9.11*10−3T
これらの式は、δν、およびλを測定することによる温度T、および曲げ半径の決定をも可能にする。
102 ポンプレーザ
103、104 回転可能なファイバホルダ
105、106 波長分割多重装置(WDM)
900a 変換器
900b 装置
901 DFBファイバレーザ
902 バネ
903 真っ直ぐなDFBレーザ
904 検知器
905、906 ファイバホルダ
910 DFBファイバ
912、1002 回折格子
914 開管型のガイド
918 可動のホルダ
920 ガイド
922 真っ直ぐな回折格子
924 滑車
1000 断面図
1001 高圧縮性の材料
1003 低圧縮性の材料
1500 ファイバ
1501 DFBレーザコア
1502、1503 空胴、空隙
Claims (13)
- 測定量を感知するセンサであって、
少なくとも一つのコアを有するファイバと、
前記少なくとも一つのコア内の単一のファイバ回折格子により形成される少なくとも一つのファイバレーザ空胴共振器とを備え、前記ファイバのコアが、その長さの少なくとも一部に沿って少なくとも二つのモードを有する前記ファイバレーザ空胴共振器を備え、前記少なくとも一つのファイバ空胴共振器が非線形形状に曲げられる第一の部分を含み、さらに、
前記ファイバレーザ空胴共振器に接続される少なくとも一つのポンプレーザを備える、センサ。 - 前記測定量の変化を前記ファイバレーザ空胴共振器の前記第一の部分の非線形形状の変化に変換する、前記ファイバに接続される構造を備える、請求項1に記載のセンサ。
- 前記測定量の変化が前記モードのずれをもたらし、それにより、RFビートノートの変化を生成し、前記センサは、前記RFビートノートを検知する前記ファイバレーザ空胴共振器に接続されるRF検知器を備える、請求項1に記載のセンサ。
- 前記単一のファイバ回折格子が分布帰還型レーザである、請求項1に記載のセンサ。
- 前記ファイバレーザ空胴共振器が、変化する圧力あるいは振動の結果として前記ファイバ自身が曲がることをもたらす前記ファイバの半径方向に非対称な歪みを生じさせる異方性圧力特性を有するファイバ断面を有する、請求項1に記載のセンサ。
- 前記分布帰還型ファイバレーザに接続される光検知器をさらに備える、請求項1に記載のセンサ。
- 前記ファイバレーザ空胴共振器がその長さの少なくとも一部に沿う複屈折の低速軸と高速軸とを有する、請求項1に記載のセンサ。
- 前記測定量が、圧力、あるいは温度、あるいは振動、あるいは化学反応である、請求項1に記載のセンサ。
- 前記光検知器に接続される周波数復調器をさらに備える、請求項6に記載のセンサ。
- 前記センサが光ヘテロダインマイクロフォンである、請求項1に記載のセンサ。
- 測定量を感知するセンサであって、
第一のコアを有数る第一の分布帰還型レーザと第二のコアを有する第二の分布帰還型レーザとを備え、前記第一および第二の分布帰還型レーザの両方が単一のファイバ内に配され、そして、前記第一および第二の分布帰還型レーザの両方が揺らぎにさらされ、
前記第一のコアおよび前記第二のコアのそれぞれが少なくとも一つの相異なるモードに対応し、かつ前記摂動がそれぞれのコアの伝播定数のずれをもたらし、その結果、RFビートノートの変化をもたらし、さらに、
前記生成されたRFビートノートを検知する、前記第一のコアおよび前記第二のコアの両方に接続されているRF検知器を備える、センサ。 - それぞれがコアを備える一つ以上の付加的な分布帰還型レーザからなる、請求項11に記載のセンサ。
- 前記第一のコアおよび前記第二のコアのそれぞれが多数の相異なるモードに対応し、かつ前記第一のコアおよび前記第二のコアのそれぞれがそれぞれのRFビートノートによって特徴付けられる、請求項11に記載のセンサ。
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PCT/US2011/063194 WO2012075474A2 (en) | 2010-12-02 | 2011-12-02 | Dfb fiber laser bend sensor and optical heterodyne microphone |
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EP (1) | EP2646862B1 (ja) |
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WO2012075474A3 (en) | 2013-07-25 |
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