JP2019144266A - 分布ファイバセンサ及びシステムのための2コア光ファイバ - Google Patents
分布ファイバセンサ及びシステムのための2コア光ファイバ Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 49
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 14
- 239000002019 doping agent Substances 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 11
- 229910052732 germanium Inorganic materials 0.000 claims description 6
- 239000011162 core material Substances 0.000 claims 71
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 21
- 238000013459 approach Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229910005793 GeO 2 Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000253 optical time-domain reflectometry Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
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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
- G01D5/268—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 using optical fibres
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- G—PHYSICS
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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
- G01D5/35303—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 a reference fibre, e.g. interferometric devices
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- G—PHYSICS
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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
- G01D5/35338—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
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
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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
- G01D5/35383—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 multiple sensor devices using multiplexing techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0818—Waveguides
- G01J5/0821—Optical fibres
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—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
- G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/636—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using an arrangement of pump beam and probe beam; using the measurement of optical non-linear properties
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—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
- 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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- G—PHYSICS
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/636—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using an arrangement of pump beam and probe beam; using the measurement of optical non-linear properties
- G01N2021/638—Brillouin effect, e.g. stimulated Brillouin effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
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Abstract
Description
(a)誘導ブリルアン散乱(すなわち、ブリルアン光時間ドメイン解析、またはBOTDA)、及び
(b)自発ブリルアン散乱(すなわち、ブリルアン光時間ドメイン反射率測定、またはBOTDR)、
の2つの方式で動作する。BOTDA方式及びBOTDR方式はいずれもブリルアン周波数シフトの、検査されるコンポーネントの温度及び/または歪への、線形依存性を利用する。
14 光ファイバ半径
16 コア間距離
20,30,120,130 ファイバコア
24,34 コア半径
28,38 低屈折率リング
28a,38a 低屈折率リング半径
28d.38d 低屈折率リングオフセット距離
28w,38w 低屈折率リング幅
36 クラッド層
100a,100b BOTDRファイバセンサシステム
200a,200b BOTDAファイバセンサシステム
112,112a ミラー
114 ビームスプリッタ
116,116a,116b レーザ
118 光検出器要素
Claims (12)
- ブルリアン分布型ファイバセンサシステムにおいて、
第1のコア、第2のコア及び、前記コアを囲む、クラッド層を有する単一の光ファイバであって、前記コアのそれぞれが、それぞれのコア材料組成、ぞれぞれのコアドーパント濃度、および互いに他方のコアのコア屈折率プロファイルに対して、(i)異なるコア材料組成、(ii)異なるコアドーパント濃度、および(iii)異なるコア屈折率プロファイルを介して、前記光ファイバの他方のコアに対して少なくとも30MHzのブリルアン周波数シフトを示すように構成される、光ファイバと、
前記光ファイバへ検査光を打ち込むように構成された少なくとも1つのレーザと、
前記各コアから検査光のブリルアン散乱成分を受け取るよう構成された受信器要素であって、各コアのブリルアン周波数シフトに基づき温度および歪みを同時に測定するよう構成された、受信器素子と、
を備えるファイバセンサシステム。 - 検査光を前記光ファイバの各コアに向けるように構成された少なくとも1つのビームスプリッタをさらに備える請求項1に記載のファイバセンサシステム。
- (i)前記単一の光ファイバへプローブ検査光を打ち込むよう構成された少なくとも1つのプローブレーザと、
(ii)複数のビームスプリッタ素子と、
をさらに備え、
前記受信器要素は、前記光ファイバの各コアからのポンプ光並びに検査光を受け取るように構成され、
前記複数のビームスプリッタ素子は、前記ポンプ光並びに検査光を前記光ファイバの各コアに向けるように構成されることを特徴とする請求項1に記載のファイバセンサシステム。 - (i)前記単一の光ファイバが、さらに前記コアの少なくとも一方を囲むように構成された屈折率リングを有し、
(ii)前記クラッド層に対する前記コアの相対屈折率が約0.2%から2%の間にあるように前記コアが構成され、及び/または
(iii)前記コアが、
(1)異なる組成、及び/または
(2)複数の動作波長において異なるモードフィールド径、
を有する、
ことを特徴とする請求項1に記載のファイバセンサシステム。 - 前記単一の光ファイバが、
(i)500μm以下の半径を有する、及び/または
(ii)前記コア間のクロストークが−20dB/km以下であるように構成される、
ことを特徴とする請求項1に記載のファイバセンサシステム。 - 前記光ファイバの第1の端部から当該光ファイバへポンプ検査光を打ち込むよう構成された少なくとも1つのポンプレーザと、
前記光ファイバの第2の端部から当該光ファイバへプローブ検査光を打ち込むよう構成された少なくとも1つのプローブレーザと、
前記ポンプ検査光並びに前記プローブ検査光を前記光ファイバの各コアへ向けるよう構成された複数のビームスプリッタと、
をさらに備える、請求項1に記載のファイバセンサシステム。 - 前記光ファイバが、さらに前記コアの少なくとも一方を囲むように構成された屈折率リング及び、前記コアの前記少なくとも一方から前記屈折率リングを隔てるトレンチを有することを特徴とする請求項1に記載のファイバセンサシステム。
- 前記クラッド層に対する前記コアの相対屈折率が約0.2%から2%の間にあり、前記コアの中心間の距離が少なくとも25μmであるように、前記コアが構成されることを特徴とする請求項1に記載のファイバセンサシステム。
- 前記各コアは、当該コア間のゲルマニウムドーパント濃度の絶対値の差が約1.6モル%以上となるように、互いに異なるゲルマニウム濃度でドープされ、さらに、
前記コアは、各コアの中心間の距離が約55μmであり、前記クラッドが約125μmの外径を有するように構成される、
ことを特徴とする請求項1に記載のファイバセンサシステム。 - 前記受信器要素は、
- ファイバセンサであって、
(I)光を供給する少なくとも1つの光源と;
(II)前記光源に結合された光ファイバであって、第1のコア、第2のコア、および両方のコアを囲むクラッドと有し、各コアは、前記光がコアに打ち込まれたときに単一のプリルアン周波数シフトピーク(BFSピーク)を示すように構成され、さらに、各コアのBFSピークは周波数において他のコアのBSFピークと異なり、各コアは他のコアに対して少なくとも80MHzのブリルアン周波数シフトを示すように構成される、光ファイバと、
を備え、
前記光ファイバは、以下の条件のうち少なくとも1つを満たす:
(i)各コアは、その長さに沿って実質的に均一でるとともに他のコアの屈折率プロファイルとは異なる屈折率プロファイルを有するように構成される;
(ii)各コアは他のコアのドーパント濃度とは異なるドーパント濃度を有するように構成される;
(iii)各コアは他のコアとは異なる組成を有する;
(iv)前記光ファイバは、少なくとも1つのコアを囲むように構成された屈折率リングをさらに有する;
(v)前記コアは各コアの中心間の距離が少なくとも25μmであるように構成される;
(vi)前記コアは各コアの中心間の距離が少なくとも25μmであり、且つ、各コアは低屈折率リングによって囲まれるように構成される、
ことを特徴とする、ファイバセンサ。 - 光ファイバであって、
第1のコア、第2のコア、および両方のコアを囲むクラッドを有し、以下の条件のうち少なくとも1つを満たす:
(i)各コアは、その長さに沿って実質的に均一でるとともに他のコアの屈折率プロファイルとは異なる屈折率プロファイルを有するように構成される;
(ii)各コアは他のコアのドーパント濃度とは異なるドーパント濃度を有するように構成される;
(iii)各コアは他のコアとは異なる組成を有する;
(iv)前記光ファイバは、少なくとも1つのコアを囲むように構成された屈折率リングをさらに有する;
(v)前記コアは各コアの中心間の距離が少なくとも25μmであるように構成される;
(vi)前記コアは各コアの中心間の距離が少なくとも25μmであり、且つ、各コアは低屈折率リングによって囲まれるように構成され、各コアは、前記光がコアに打ち込まれたときに単一のプリルアン周波数シフトピーク(BFSピーク)を示すように構成され、さらに、各コアのBFSピークは周波数において他のコアのBSFピークと異なり、各コアは他のコアに対して少なくとも80MHzのブリルアン周波数シフトを示すように構成される、
ことを特徴とする、光ファイバ。
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US201261681402P | 2012-08-09 | 2012-08-09 | |
US61/681,402 | 2012-08-09 | ||
US13/658,991 | 2012-10-24 | ||
US13/658,991 US9574911B2 (en) | 2012-08-09 | 2012-10-24 | Two-core optical fibers for distributed fiber sensors and systems |
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EP (1) | EP2883023B1 (ja) |
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CA2920157C (en) | 2020-08-18 |
US9574911B2 (en) | 2017-02-21 |
WO2014025614A1 (en) | 2014-02-13 |
US10591666B2 (en) | 2020-03-17 |
EP2883023A1 (en) | 2015-06-17 |
CA2920157A1 (en) | 2014-02-13 |
JP2015531861A (ja) | 2015-11-05 |
US20140042306A1 (en) | 2014-02-13 |
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US20170089834A1 (en) | 2017-03-30 |
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