NO20003753D0 - System og fremgangsmÕte for fiberoptisk avføling - Google Patents

System og fremgangsmÕte for fiberoptisk avføling

Info

Publication number
NO20003753D0
NO20003753D0 NO20003753A NO20003753A NO20003753D0 NO 20003753 D0 NO20003753 D0 NO 20003753D0 NO 20003753 A NO20003753 A NO 20003753A NO 20003753 A NO20003753 A NO 20003753A NO 20003753 D0 NO20003753 D0 NO 20003753D0
Authority
NO
Norway
Prior art keywords
fiber optic
sensing system
optic sensing
fiber
sensing
Prior art date
Application number
NO20003753A
Other languages
English (en)
Other versions
NO20003753L (no
Inventor
J Brett Bunn
James S Bunn
J Mikko Jaaskelainen
Steven J Maas
Original Assignee
Petroleum Geo Services Us Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petroleum Geo Services Us Inc filed Critical Petroleum Geo Services Us Inc
Publication of NO20003753L publication Critical patent/NO20003753L/no
Publication of NO20003753D0 publication Critical patent/NO20003753D0/no

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08—Testing mechanical properties
    • G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
    • G01M11/085—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT] the optical fiber being on or near the surface of the DUT
    • 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
    • G01D5/35306—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 an interferometer arrangement
    • G01D5/35329—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 an interferometer arrangement using interferometer with two arms in transmission, e.g. Mach-Zender interferometer
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0128—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects
    • G02F1/0131—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
    • G02F1/0134—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence in optical waveguides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/212—Mach-Zehnder type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/213—Fabry-Perot type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/30—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 grating
    • G02F2201/307—Reflective grating, i.e. Bragg grating

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Optical Transform (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
NO20003753A 1998-01-23 2000-07-21 System og fremgangsmÕte for fiberoptisk avføling NO20003753D0 (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/012,368 US6314056B1 (en) 1998-01-23 1998-01-23 Fiber optic sensor system and method
PCT/US1999/001168 WO1999038048A1 (en) 1998-01-23 1999-01-20 Fiber optic sensor system and method

Publications (2)

Publication Number Publication Date
NO20003753L NO20003753L (no) 2000-07-21
NO20003753D0 true NO20003753D0 (no) 2000-07-21

Family

ID=21754638

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20003753A NO20003753D0 (no) 1998-01-23 2000-07-21 System og fremgangsmÕte for fiberoptisk avføling

Country Status (10)

Country Link
US (1) US6314056B1 (no)
EP (1) EP1049954A1 (no)
CN (1) CN1252512C (no)
AU (1) AU748184B2 (no)
BR (1) BR9907143A (no)
CA (1) CA2305437C (no)
EA (1) EA200000751A1 (no)
HK (1) HK1035780A1 (no)
NO (1) NO20003753D0 (no)
WO (1) WO1999038048A1 (no)

Families Citing this family (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5986749A (en) 1997-09-19 1999-11-16 Cidra Corporation Fiber optic sensing system
CA2278356C (en) * 1998-07-31 2005-03-22 David B. Hall Optical waveguide sensor system for remote detection
US6305227B1 (en) 1998-09-02 2001-10-23 Cidra Corporation Sensing systems using quartz sensors and fiber optics
US6137621A (en) * 1998-09-02 2000-10-24 Cidra Corp Acoustic logging system using fiber optics
WO2000012978A1 (en) * 1998-09-02 2000-03-09 Cidra Corporation Seismic sensing and acoustic logging systems using optical fiber, transducers and sensors
US6346985B1 (en) * 1999-10-29 2002-02-12 Litton Systems, Inc. Optical method for the transduction of remote arrays of electromechanical sensors
EP1255140A1 (en) * 2001-04-23 2002-11-06 Alcatel Temperature compensating device for optical fibre gratings
US6850461B2 (en) * 2002-07-18 2005-02-01 Pgs Americas, Inc. Fiber-optic seismic array telemetry, system, and method
GB2417627B (en) * 2002-07-18 2006-07-19 Pgs Americas Inc Fiber-optic seismic array telemetry system, and method
GB2397121B (en) * 2002-12-20 2005-06-08 Sensor Highway Ltd System and method to minimize modulation instability
EP1961260B1 (en) * 2005-11-21 2013-11-20 Thales Underwater Systems PTY Limited Apparatus for measuring acoustic pressure
AU2006315100B2 (en) * 2005-11-21 2011-05-12 Thales Australia Ltd Methods, systems and apparatus for measuring acoustic pressure
US20130167628A1 (en) * 2007-02-15 2013-07-04 Hifi Engineering Inc. Method and apparatus for detecting an acoustic event along a channel
US20090058422A1 (en) * 2007-09-04 2009-03-05 Stig Rune Tenghamn Fiber optic system for electromagnetic surveying
US7812960B2 (en) 2007-10-16 2010-10-12 Judd Gardner Optical ultrasound device
US8682159B2 (en) * 2008-07-09 2014-03-25 Tyco Electronics Subsea Communications Llc Optical communication system supporting detection and communication networks
US20100045296A1 (en) 2008-08-19 2010-02-25 Pgs Geophysical As Cable system for marine data acquisition
DE102008044810B4 (de) * 2008-08-28 2010-08-26 Northrop Grumman Litef Gmbh Faseroptisches Interferometer und Verfahren zur Bestimmung physikalischer Zustandsgrößen im Innern einer Faserspule eines faseroptischen Interferometers
US20100309750A1 (en) * 2009-06-08 2010-12-09 Dominic Brady Sensor Assembly
MD298Z (ro) * 2010-03-03 2011-07-31 Институт Прикладной Физики Академии Наук Молдовы Sistem cu fibră optică a semnalizării de pază
GB2481845B (en) * 2010-07-08 2014-04-30 Electromagnetic Geoservices As Low noise marine electric field sensor system
CN104919339B (zh) 2012-03-08 2018-01-12 国际壳牌研究有限公司 集成地震监控系统和方法
US9273548B2 (en) 2012-10-10 2016-03-01 Halliburton Energy Services, Inc. Fiberoptic systems and methods detecting EM signals via resistive heating
US9188694B2 (en) 2012-11-16 2015-11-17 Halliburton Energy Services, Inc. Optical interferometric sensors for measuring electromagnetic fields
US9091785B2 (en) 2013-01-08 2015-07-28 Halliburton Energy Services, Inc. Fiberoptic systems and methods for formation monitoring
US9321630B2 (en) 2013-02-20 2016-04-26 Pgs Geophysical As Sensor with vacuum-sealed cavity
US9470806B2 (en) 2013-08-29 2016-10-18 Pgs Geophysical As Piezoelectric accelerometer
US10591622B2 (en) 2013-10-30 2020-03-17 Pgs Geophysical As Reconfigurable seismic sensor cable
US9513398B2 (en) 2013-11-18 2016-12-06 Halliburton Energy Services, Inc. Casing mounted EM transducers having a soft magnetic layer
US9784861B2 (en) 2014-01-31 2017-10-10 Pgs Geophysical As Hydrophone
US10175437B2 (en) 2014-02-18 2019-01-08 Pgs Geophysical As Subsea cable having floodable optical fiber conduit
US9557439B2 (en) 2014-02-28 2017-01-31 Halliburton Energy Services, Inc. Optical electric field sensors having passivated electrodes
US20160252344A1 (en) * 2014-06-19 2016-09-01 Nano And Advanced Materials Institute Limited Self referenced intensity-based polymer optical fibre displacement sensor
WO2016032517A1 (en) 2014-08-29 2016-03-03 Schlumberger Canada Limited Fiber optic magneto-responsive sensor assembly
US9829503B2 (en) 2014-10-03 2017-11-28 Pgs Geophysical As Apparatuses, systems, and methods for accelerometers
US10101481B2 (en) 2014-10-03 2018-10-16 Pgs Geophysical As Floodable optical apparatus, methods and systems
US9927221B2 (en) 2014-10-03 2018-03-27 Pgs Geophysical As Pressure-balanced seismic sensor package
US9746633B2 (en) 2014-10-03 2017-08-29 Pgs Geophysical As Clamp and bending strain relief apparatus and methods
WO2016060678A1 (en) * 2014-10-17 2016-04-21 Halliburton Energy Services, Inc. Well monitoring with optical electromagnetic sensing system
US10302796B2 (en) 2014-11-26 2019-05-28 Halliburton Energy Services, Inc. Onshore electromagnetic reservoir monitoring
CN107111169B (zh) * 2014-12-23 2020-06-19 莱恩尼克斯国际有限责任公司 应力调谐平面照明电路及其方法
BR112019002827A2 (pt) 2016-08-31 2019-05-21 Halliburton Energy Services, Inc. sistema, método para processar levantamentos das vsp em tempo real e sistema de processamento de informação comunicativamente acoplado a um sistema de coleta de dados de detecção acústica distribuída
MX2019008396A (es) 2017-01-18 2019-09-10 Halliburton Energy Services Inc Efecto de la longitud de referencia y conversion de la longitud de referencia.
CN107015074B (zh) * 2017-03-30 2018-05-08 信丰县包钢新利稀土有限责任公司 一种稀土掺杂铁电材料压电系数的测量系统
CA3064870C (en) 2017-06-28 2021-12-28 Halliburton Energy Services, Inc. Angular response compensation for das vsp
CN109798925B (zh) * 2019-01-15 2021-01-19 太原理工大学 一种量程可调的匹配光栅解调装置
CN109813418A (zh) * 2019-03-18 2019-05-28 曲阜师范大学 一种一维光纤矢量传声器探头
CN115598647A (zh) * 2022-12-13 2023-01-13 三微电子科技（苏州）有限公司（Cn） 一种薄膜压电声压传感器和探测成像装置
CN117368557A (zh) * 2023-09-27 2024-01-09 哈尔滨理工大学 一种基于相位解调的光纤电流互感器及其在电缆护层接地电流检测中的应用

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162397A (en) 1978-06-28 1979-07-24 The United States Of America As Represented By The Secretary Of The Navy Fiber optic acoustic sensor
CA1124384A (en) 1979-08-09 1982-05-25 Paolo G. Cielo Stable fiber-optic hydrophone
US4390974A (en) 1981-01-08 1983-06-28 Litton Resources Systems, Inc. Seismic data telemetric system
US4799202A (en) 1982-09-27 1989-01-17 The United States Of America As Represented By The Secretary Of The Navy Complementary interferometric hydrophone
US4648083A (en) 1985-01-03 1987-03-03 The United States Of America As Represented By The Secretary Of The Navy All-optical towed and conformal arrays
US4799752A (en) 1987-09-21 1989-01-24 Litton Systems, Inc. Fiber optic gradient hydrophone and method of using same
US5363342A (en) 1988-04-28 1994-11-08 Litton Systems, Inc. High performance extended fiber optic hydrophone
US4959539A (en) 1989-03-20 1990-09-25 The United States Of America As Represented By The Secretary Of The Navy Flexural disk fiber optic hydrophone
FR2646309B1 (fr) * 1989-04-24 1997-01-31 Technomed Int Sa Procede de fabrication d'un capteur acoustique et capteur acoustique ainsi obtenu, a couche de protection indecollable
US5256237A (en) 1990-04-23 1993-10-26 Litton Systems, Inc. Inner surface fiber affixation for manufacturing a sensor mandrel
US5155548A (en) 1990-05-22 1992-10-13 Litton Systems, Inc. Passive fiber optic sensor with omnidirectional acoustic sensor and accelerometer
US5475216A (en) 1990-05-22 1995-12-12 Danver; Bruce A. Fiber optic sensor having mandrel wound reference and sensing arms
US5253222A (en) 1992-01-28 1993-10-12 Litton Systems, Inc. Omnidirectional fiber optic hydrophone
US5276657A (en) 1992-02-12 1994-01-04 The Pennsylvania Research Corporation Metal-electroactive ceramic composite actuators
US5313266A (en) 1992-08-17 1994-05-17 Keolian Robert M Demodulators for optical fiber interferometers with [3×3] outputs
US5361130A (en) * 1992-11-04 1994-11-01 The United States Of America As Represented By The Secretary Of The Navy Fiber grating-based sensing system with interferometric wavelength-shift detection
US5317544A (en) 1992-11-09 1994-05-31 Litton Systems, Inc. Multiple segment fiber optic hydrophone
US5285424A (en) 1992-12-28 1994-02-08 Litton Systems, Inc. Wide bandwidth fiber optic hydrophone
US5305333A (en) 1992-12-31 1994-04-19 North American Philips Corporation Method and apparatus for amplitude modulation of laser light
AU665490B2 (en) 1993-05-28 1996-01-04 Litton Industries Inc. Fiber optic planar hydrophone
US5394377A (en) 1993-06-01 1995-02-28 Litton Systems, Inc. Polarization insensitive hydrophone
US5394378A (en) 1993-06-21 1995-02-28 The United States Of America As Represented By The Secretary Of The Navy Hydrophone transduction mechanism
US5497233A (en) 1994-07-27 1996-03-05 Litton Systems, Inc. Optical waveguide vibration sensor and method
US5675674A (en) 1995-08-24 1997-10-07 Rockbit International Optical fiber modulation and demodulation system

Also Published As

Publication number Publication date
HK1035780A1 (en) 2001-12-07
EP1049954A1 (en) 2000-11-08
WO1999038048A1 (en) 1999-07-29
US6314056B1 (en) 2001-11-06
CN1288526A (zh) 2001-03-21
AU748184B2 (en) 2002-05-30
CA2305437C (en) 2007-04-10
NO20003753L (no) 2000-07-21
BR9907143A (pt) 2000-10-24
AU2328899A (en) 1999-08-09
EA200000751A1 (ru) 2000-12-25
CN1252512C (zh) 2006-04-19
CA2305437A1 (en) 1999-07-29

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