JP5469749B2 - 位相ベース検知 - Google Patents
位相ベース検知 Download PDFInfo
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- JP5469749B2 JP5469749B2 JP2012531489A JP2012531489A JP5469749B2 JP 5469749 B2 JP5469749 B2 JP 5469749B2 JP 2012531489 A JP2012531489 A JP 2012531489A JP 2012531489 A JP2012531489 A JP 2012531489A JP 5469749 B2 JP5469749 B2 JP 5469749B2
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- signal
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- 238000001514 detection method Methods 0.000 title description 2
- 239000000835 fiber Substances 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 25
- 230000008859 change Effects 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 8
- 238000013459 approach Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005305 interferometry Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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
- G01D5/35303—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
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Description
C1=(f2−f1)+(f4−f3)
C2=(f2−f1)+(f3−f4)
C3=f2−f1
または
C4=f3−f4
を与える干渉計の両方のアームを通過する同じパルスから生じる。
f1=0MHz、f2=10MHz、f3=20MHz、およびf4=50MHzである場合、
C1=40MHz、C2=20MHz、C3=10MHz、およびC4=30MHzとなるが、ただし、いずれの場合も周波数は正の数として示される。パルスf1〜f4について示される周波数は、全て任意の基準に対するものであり、そのため正の数と同様に、ゼロまたは負の数を有することもできることに留意されたい。
Claims (17)
- ある長さの光ファイバに問い合わせることによる分散型音響検知(DAS)の方法において、前記光ファイバが、検知されたパラメータに応えて信号伝播の位相の変化を提供し、
ある長さの光ファイバ内に入力信号を導入するステップと、
前記入力信号に応えて前記光ファイバから後方散乱された帰還信号を受信するステップと、
第一の時点で前記ファイバの一部分から後方散乱された第一帰還信号と、第二の異なる時点で前記ファイバの同じ部分から後方散乱された第二帰還信号とを比較するステップと、
前記比較から、前記後方散乱信号の時間による位相の変化率の測定値を導き出すステップと、を含む方法。 - 前記第一帰還信号が、前記第二帰還信号に対して周波数偏移されている、請求項1に記載の方法。
- 第一帰還信号が第一周波数偏移によって変調され、前記第二帰還信号が第二周波数偏移によって変調される、請求項2に記載の方法。
- 前記方法が、受信した帰還信号を出力干渉計に通すステップを含み、前記出力干渉計が、異なる周波数偏移によって各アームの信号を変調するために配置される、請求項1または2に記載の方法。
- 前記入力信号が、1対の時間間隔パルスを含む、請求項1から4のいずれかに記載の方法。
- 前記パルスが異なる周波数偏移を有する、請求項5に記載の方法。
- 前記測定された位相の変化率に基づいて位相値を得るステップをさらに含む、請求項1から6のいずれかに記載の方法。
- 第一の時点で前記ファイバの第一部分から後方散乱された第一帰還信号と、実質的に同じ時点で前記ファイバの第二の異なる部分から後方散乱された第二帰還信号とを比較するステップと、前記比較から、前記後方散乱信号の位相の測定値を導き出すステップと、をさらに含む、請求項1から7のいずれかに記載の方法。
- 前記位相の測定値および前記位相の変化率の測定値が、共通の入力信号に応えて実質的に同時に決定される、請求項8に記載の方法。
- 前記入力信号が3つの時間間隔パルスを含む、請求項1から9のいずれかに記載の方法。
- 前記入力パルスが、少なくとも2つの異なる波長を含む、請求項10に記載の方法。
- 前記第一および第三パルスの間の時間間隔が、第一および第二パルスの間の時間間隔の2倍より大きい、請求項10または11に記載の方法。
- ある長さの光ファイバに問い合わせるための分散型音響検知(DAS)システムにおいて、前記光ファイバが、検知されたパラメータに応えて信号伝播の位相の変化を提供し、
入力信号に応えて前記光ファイバから後方散乱された信号を受信するための受信器と、
第一の時点で前記ファイバの一部分から後方散乱された第一受信信号と、第二の異なる時点で前記ファイバの同じ部分から後方散乱された第二受信信号とを結合させるようになっている出力干渉計であって、前記出力干渉計が、前記第一および第二帰還信号の間に周波数差を付与するために、少なくとも1つのアームに周波数変調器を含む、出力干渉計と、
前記結合信号を受信し、前記後方散乱信号の時間による位相の変化率を判定するための、位相検出器と、を含むシステム。 - 前記出力干渉計が、前記出力干渉計の各アーム上に周波数変調器を含み、各周波数変調器が異なる周波数偏移を付与する、請求項13に記載のシステム。
- 前記システムが、前記後方散乱信号の位相を判定するための第二位相検出器を含む、請求項13または14に記載のシステム。
- 前記システムが、異なる波長を有する入力から後方散乱された信号を分離するための逆多重器を含む、請求項13から15のいずれか1つに記載のシステム。
- 第一波長における後方散乱信号が前記出力干渉計に渡され、第二波長における信号が前記第二位相検出器に直接渡される、請求項16に記載のシステム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0917150.5 | 2009-09-30 | ||
GBGB0917150.5A GB0917150D0 (en) | 2009-09-30 | 2009-09-30 | Phase based sensing |
PCT/GB2010/001802 WO2011039501A2 (en) | 2009-09-30 | 2010-09-24 | Phase based sensing |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2013506828A JP2013506828A (ja) | 2013-02-28 |
JP5469749B2 true JP5469749B2 (ja) | 2014-04-16 |
Family
ID=41350608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2012531489A Active JP5469749B2 (ja) | 2009-09-30 | 2010-09-24 | 位相ベース検知 |
Country Status (11)
Country | Link |
---|---|
US (1) | US8537345B2 (ja) |
EP (1) | EP2483639B1 (ja) |
JP (1) | JP5469749B2 (ja) |
CN (1) | CN102612639B (ja) |
BR (1) | BR112012007192B1 (ja) |
CA (1) | CA2775845C (ja) |
GB (1) | GB0917150D0 (ja) |
IN (1) | IN2012DN03047A (ja) |
MX (1) | MX2012003815A (ja) |
RU (1) | RU2556748C2 (ja) |
WO (1) | WO2011039501A2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019522197A (ja) * | 2016-06-29 | 2019-08-08 | オプタセンス・ホールデイングス・リミテツド | 列車内の力のモニタリングのための分布型光ファイバセンシング |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0810977D0 (en) * | 2008-06-16 | 2008-07-23 | Qinetiq Ltd | Phase based sensing |
CA2750905C (en) | 2008-12-31 | 2018-01-30 | Shell Internationale Research Maatschappij B.V. | Method for monitoring deformation of well equipment |
WO2010091404A1 (en) | 2009-02-09 | 2010-08-12 | Shell Oil Company | Method of detecting fluid in-flows downhole |
AU2009339275B2 (en) | 2009-02-09 | 2013-06-27 | Shell Internationale Research Maatschappij B.V. | Areal monitoring using distributed acoustic sensing |
CA2781565A1 (en) | 2009-12-23 | 2011-06-30 | Shell Internationale Research Maatschappij B.V. | Detecting broadside and directional acoustic signals with a fiber optical distributed acoustic sensing (das) assembly |
US9109944B2 (en) | 2009-12-23 | 2015-08-18 | Shell Oil Company | Method and system for enhancing the spatial resolution of a fiber optical distributed acoustic sensing assembly |
US9140815B2 (en) | 2010-06-25 | 2015-09-22 | Shell Oil Company | Signal stacking in fiber optic distributed acoustic sensing |
WO2012030814A2 (en) | 2010-09-01 | 2012-03-08 | Schlumberger Canada Limited | Distributed fiber optic sensor system with improved linearity |
EP2656125A4 (en) | 2010-12-21 | 2018-01-03 | Shell Oil Company | System and method for making distributed measurements using fiber optic cable |
US9322702B2 (en) | 2010-12-21 | 2016-04-26 | Shell Oil Company | Detecting the direction of acoustic signals with a fiber optical distributed acoustic sensing (DAS) assembly |
AU2012225422B2 (en) | 2011-03-09 | 2015-07-02 | Shell Internationale Research Maatschappij B.V. | Integrated fiber optic monitoring system for a wellsite and method of using same |
GB2489749B (en) | 2011-04-08 | 2016-01-20 | Optasense Holdings Ltd | Fibre optic distributed sensing |
CA2835228A1 (en) | 2011-05-18 | 2012-11-22 | Shell Internationale Research Maatschappij B.V. | Method and system for protecting a conduit in an annular space around a well casing |
WO2012173924A2 (en) | 2011-06-13 | 2012-12-20 | Shell Oil Company | Hydraulic fracture monitoring using active seismic sources with receivers in the treatment well |
GB2504446B (en) | 2011-06-20 | 2017-08-30 | Shell Int Res Maatschhappij B V | Fibre optic cable with increased directional sensitivity |
GB201112161D0 (en) * | 2011-07-15 | 2011-08-31 | Qinetiq Ltd | Portal monitoring |
BR112014003050A2 (pt) | 2011-08-09 | 2017-03-01 | Shell Int Research | bloco sensor, e, método para medir parâmetros sísmicos |
CA2858226C (en) | 2011-12-15 | 2018-04-24 | Shell Internationale Research Maatschappij B.V. | Detecting broadside acoustic signals with a fiber optical distributed acoustic sensing (das) assembly |
GB2519009B (en) | 2012-08-01 | 2017-09-13 | Shell Int Research | Cable comprising twisted sinusoid for use in distributed sensing |
GB2529780B (en) * | 2013-06-13 | 2018-07-04 | Schlumberger Holdings | Fiber optic distributed vibration sensing with directional sensitivity |
CA2938526C (en) | 2014-03-24 | 2019-11-12 | Halliburton Energy Services, Inc. | Well tools with vibratory telemetry to optical line therein |
WO2015168538A1 (en) * | 2014-05-02 | 2015-11-05 | Halliburton Energy Services, Inc. | Distributed acoustic sensing gauge length effect mitigation |
US10429234B2 (en) | 2015-01-21 | 2019-10-01 | Neubrex Co., Ltd. | Distributed fiber optic acoustic detection device |
WO2017087792A1 (en) * | 2015-11-20 | 2017-05-26 | Sentek Instrument, Llc | Method and apparatus for distributed sensing |
US10359302B2 (en) | 2015-12-18 | 2019-07-23 | Schlumberger Technology Corporation | Non-linear interactions with backscattered light |
US11976552B2 (en) | 2016-10-05 | 2024-05-07 | Halliburton Energy Services, Inc. | Distributed sensing systems and methods with spatial location correlation |
CN110914645B (zh) * | 2017-07-26 | 2022-08-02 | 特拉15私人有限公司 | 分布式光学感测系统和方法 |
KR102404377B1 (ko) * | 2017-10-27 | 2022-05-31 | 주식회사 케이티 | 광 펄스를 이용한 인프라 모니터링 시스템 및 방법 |
CN113405577B (zh) * | 2018-05-30 | 2022-11-11 | 华为技术有限公司 | 一种测量方法及测量装置 |
WO2020032878A1 (en) * | 2018-08-08 | 2020-02-13 | Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Extinction ratio free phase sensitive optical time domain reflectometry based distributed acoustic sensing system |
US11320304B2 (en) * | 2019-05-22 | 2022-05-03 | Nec Corporation | Multi-frequency coherent distributed acoustic sensing (DAS) with single transmitter / receiver pair using offset Tx / Rx frequency framing scheme |
US11378443B2 (en) * | 2019-05-22 | 2022-07-05 | Nec Corporation | Performance of Rayleigh-based phase-OTDR with correlation-based diversity combining and bias removal |
FR3104730B1 (fr) * | 2019-12-12 | 2021-12-24 | Thales Sa | Dispositif de mesure de signaux delivres par un reseau de capteurs a base de cavites laser a fibre optique |
US20210318162A1 (en) * | 2020-04-08 | 2021-10-14 | Nec Laboratories America, Inc | Two stage processing distributed fiber optic sensing (dfos) interrogator for acoustic modulated signals |
IT202200004667A1 (it) | 2022-03-11 | 2022-06-11 | Sestosensor S R L | Rivelatore di fase e polarizzazione per sensori acustici distribuiti a fibre ottiche ed interrogatore basato sullo stesso |
IT202200012014A1 (it) | 2022-06-07 | 2023-12-07 | Sestosensor S R L | Rivelatore interferometrico a miscelazione (interferodina) ed interrogatore per sensori distribuiti a fibre ottiche basato sullo stesso |
Family Cites Families (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4121155A (en) | 1976-12-02 | 1978-10-17 | The Charles Stark Draper Laboratory, Inc. | Position readout device |
US4231260A (en) | 1978-11-03 | 1980-11-04 | The Charles Stark Draper Laboratory, Inc. | Position determining system |
US4697926A (en) | 1985-02-08 | 1987-10-06 | The Board Of Trustees Of The Leland Stanford Junior University | Coherent distributed sensor and method using short coherence length sources |
US4770535A (en) | 1985-02-08 | 1988-09-13 | The Board Of Trustees Of The Leland Stanford Junior University | Distributed sensor array and method using a pulsed signal source |
US4699513A (en) | 1985-02-08 | 1987-10-13 | Stanford University | Distributed sensor and method using coherence multiplexing of fiber-optic interferometric sensors |
US4649529A (en) | 1985-12-02 | 1987-03-10 | Exxon Production Research Co. | Multi-channel fiber optic sensor system |
GB8609732D0 (en) | 1986-04-22 | 1986-05-29 | Plessey Co Plc | Optical fibre sensing systems |
US4848906A (en) | 1987-02-02 | 1989-07-18 | Litton Systems, Inc. | Multiplexed fiber optic sensor |
GB2219902B (en) * | 1988-06-14 | 1992-01-22 | Plessey Co Plc | Optical sensing systems |
US5787053A (en) | 1989-07-07 | 1998-07-28 | The United States Of America As Represented By The Secretary Of The Navy | Continuous fiber pulse reflecting means |
US5140154A (en) | 1991-01-16 | 1992-08-18 | The United States Of America As Represented By The Secretary Of The Navy | Inline fiber optic sensor arrays with delay elements coupled between sensor units |
JPH0545209A (ja) * | 1991-08-09 | 1993-02-23 | Oki Electric Ind Co Ltd | 光音響センサアレイシステム |
US5412474A (en) | 1992-05-08 | 1995-05-02 | Smithsonian Institution | System for measuring distance between two points using a variable frequency coherent source |
RU2091762C1 (ru) * | 1994-06-01 | 1997-09-27 | Акционерное общество открытого типа "Лыткаринский завод оптического стекла" | Рефлектометр |
US5680489A (en) | 1996-06-28 | 1997-10-21 | The United States Of America As Represented By The Secretary Of The Navy | Optical sensor system utilizing bragg grating sensors |
US6522797B1 (en) | 1998-09-01 | 2003-02-18 | Input/Output, Inc. | Seismic optical acoustic recursive sensor system |
US6449046B1 (en) | 1999-05-17 | 2002-09-10 | Chung-Shan Institute Of Science And Technology | Optically amplified WDM/TDM hybrid polarization-insensitive fiber-optic interferometric sensor system |
US6466706B1 (en) | 2000-10-11 | 2002-10-15 | The United States Of America As Represented By The Secretary Of The Navy | Pulsed system and method for fiber optic sensor |
US6785004B2 (en) | 2000-11-29 | 2004-08-31 | Weatherford/Lamb, Inc. | Method and apparatus for interrogating fiber optic sensors |
US7557929B2 (en) * | 2001-12-18 | 2009-07-07 | Massachusetts Institute Of Technology | Systems and methods for phase measurements |
US7119325B2 (en) | 2003-01-27 | 2006-10-10 | Bookham Technology Plc | System and method for monitoring environmental effects using optical sensors |
US7003202B2 (en) * | 2003-04-28 | 2006-02-21 | The Furukawa Electric Co., Ltd. | Method and system for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber, method of manufacturing optical fibers, method of measuring wavelength-dispersion distribution, method of compensating for measurement errors, and method of specifying conditions of measurement |
JP2005014059A (ja) | 2003-06-26 | 2005-01-20 | Ricoh Co Ltd | 超短パルスレーザ加工法及び加工装置並びに構造体 |
GB2406376A (en) * | 2003-09-24 | 2005-03-30 | Qinetiq Ltd | Surveillance system including serial array of fiber optic point sensors |
NO339298B1 (no) | 2003-10-10 | 2016-11-21 | Optoplan As | Aktiv koherensreduksjon for interferometeravspørring |
GB0424305D0 (en) | 2004-11-03 | 2004-12-01 | Polarmetrix Ltd | Phase-disturbance location and measurement in optical-fibre interferometric reflectometry |
US7336365B2 (en) | 2005-02-11 | 2008-02-26 | Optoplan As | Method and apparatus for suppression of crosstalk and noise in time-division multiplexed interferometric sensor systems |
FR2889305B1 (fr) | 2005-07-28 | 2007-10-19 | Sercel Sa | Reseau d'interferometres a fibre optique |
US7327462B2 (en) | 2005-08-17 | 2008-02-05 | Litton Systems, Inc. | Method and apparatus for direct detection of signals from a differential delay heterodyne interferometric system |
GB0521713D0 (en) | 2005-10-25 | 2005-11-30 | Qinetiq Ltd | Traffic sensing and monitoring apparatus |
US7372576B2 (en) | 2005-11-01 | 2008-05-13 | Agilent Technologies, Inc. | System and method for generating beams of light using an anisotropic acousto-optic modulator |
US7375819B2 (en) | 2005-11-01 | 2008-05-20 | Agilent Technologies, Inc. | System and method for generating beams of light using an anisotropic acousto-optic modulator |
US8670662B2 (en) * | 2006-04-03 | 2014-03-11 | British Telecommunications Public Limited Company | Evaluating the position of an optical fiber disturbance |
GB2442745B (en) | 2006-10-13 | 2011-04-06 | At & T Corp | Method and apparatus for acoustic sensing using multiple optical pulses |
GB2442746B (en) * | 2006-10-13 | 2011-04-06 | At & T Corp | Method and apparatus for acoustic sensing using multiple optical pulses |
GB2443661B (en) * | 2006-11-08 | 2011-08-31 | Polarmetrix Ltd | Detecting a disturbance in the phase of light propogating in an optical waveguide |
GB0705240D0 (en) * | 2007-03-14 | 2007-04-25 | Qinetiq Ltd | Phase based sensing |
GB0810977D0 (en) | 2008-06-16 | 2008-07-23 | Qinetiq Ltd | Phase based sensing |
GB0815523D0 (en) | 2008-08-27 | 2008-10-01 | Qinetiq Ltd | Phase based sensing |
-
2009
- 2009-09-30 GB GBGB0917150.5A patent/GB0917150D0/en not_active Ceased
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2010
- 2010-09-24 JP JP2012531489A patent/JP5469749B2/ja active Active
- 2010-09-24 MX MX2012003815A patent/MX2012003815A/es active IP Right Grant
- 2010-09-24 CA CA2775845A patent/CA2775845C/en active Active
- 2010-09-24 EP EP10763396.8A patent/EP2483639B1/en active Active
- 2010-09-24 WO PCT/GB2010/001802 patent/WO2011039501A2/en active Application Filing
- 2010-09-24 US US13/499,076 patent/US8537345B2/en active Active
- 2010-09-24 CN CN201080044182.2A patent/CN102612639B/zh not_active Expired - Fee Related
- 2010-09-24 IN IN3047DEN2012 patent/IN2012DN03047A/en unknown
- 2010-09-24 RU RU2012117750/28A patent/RU2556748C2/ru not_active IP Right Cessation
- 2010-09-24 BR BR112012007192-0A patent/BR112012007192B1/pt active IP Right Grant
Cited By (1)
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BR112012007192A2 (pt) | 2016-03-29 |
CA2775845C (en) | 2017-11-14 |
MX2012003815A (es) | 2012-06-19 |
CA2775845A1 (en) | 2011-04-07 |
JP2013506828A (ja) | 2013-02-28 |
EP2483639A2 (en) | 2012-08-08 |
EP2483639B1 (en) | 2020-03-04 |
WO2011039501A3 (en) | 2012-02-16 |
GB0917150D0 (en) | 2009-11-11 |
RU2556748C2 (ru) | 2015-07-20 |
IN2012DN03047A (ja) | 2015-07-31 |
WO2011039501A2 (en) | 2011-04-07 |
US8537345B2 (en) | 2013-09-17 |
CN102612639A (zh) | 2012-07-25 |
US20120188533A1 (en) | 2012-07-26 |
RU2012117750A (ru) | 2013-11-20 |
BR112012007192B1 (pt) | 2021-06-22 |
CN102612639B (zh) | 2014-10-08 |
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