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公开(公告)号：US20090087136A1
公开(公告)日：2009-04-02
申请号：US12293172
申请日：2007-03-29
申请人： Philip John Nash , David John Hill
发明人： Philip John Nash , David John Hill
CPC分类号： G01H9/004 , G01D5/35383 , G01V1/16 , G01V1/184 , G01V1/186
摘要： A fibre-optic sensor package (10) comprises a serial array of fibre-optic sensing coils (14, 16, 18, 20, 22) each of which is comprised in a respective fibre-optic sensor. Four (14, 16, 18, 22) of the coils are housed in a protective casing (24). One of the coils (22) is comprised in a fibre-optic electromagnetic field sensor. The other coils are comprised in respective fibre-optic geophones and/or hydrophones. A single package of the invention allows detection of both seismic and electromagnetic signals. An array of packages of the invention provides detection of both seismic and electromagnetic signal at a series of positions over a long distance or wide area, thus avoiding the need for two conventional arrays. A packages of the invention, and an array of such packages, require little or no electrical power input.
摘要翻译： 光纤传感器封装（10）包括光纤传感线圈（14,16,18,20,22）的串联阵列，每个光纤传感线圈包括在相应的光纤传感器中。 四个（14,16,18,22）的线圈被容纳在保护壳体（24）中。 其中一个线圈（22）包含在光纤电磁场传感器中。 其他线圈包括在相应的光纤地震检波器和/或水听器中。 本发明的单个包装允许检测地震和电磁信号。 本发明的封装阵列提供在长距离或广泛区域上的一系列位置处的地震和电磁信号的检测，从而避免了对两个常规阵列的需要。 本发明的封装和这种封装的阵列需要很少或没有电力输入。
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公开(公告)号：US09739645B2
公开(公告)日：2017-08-22
申请号：US13509415
申请日：2010-11-11
CPC分类号： G01D5/35361 , G01D5/35348
摘要： A method of distributed fiber optic sensing is described in which an optical fiber (104) is interrogated with electromagnetic radiation; back-scattered radiation is detected; and the returns are processed to provide a measurement signal (310) for each of a plurality of longitudinal sensing portions of the optical fiber. The method comprises analyzing the measurement signals of a first subset of longitudinal sensing portions to provide a first zone (306a) having a first sensing function and analyzing the measurement signals of at least a second subset of longitudinal sensing portions to provide at least a second zone (306b) having a second, different, sensing function. The different sensing functions may include detecting different events of interest. In some embodiments the geometry of the fiber may provide different sensing zones (406a, 406b).
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公开(公告)号：US09599489B2
公开(公告)日：2017-03-21
申请号：US12282784
申请日：2007-03-08
CPC分类号： G01D5/35383 , G01D5/35303
摘要： A fiber-optic sensor array (100) comprises a line array of fiber-optic sensor packages (AX, BX, CX, DX, AY, BY, CY, DY, AZ, BZ, CZ, DZ) each having a package input/output (i/o) fiber and each being arranged to output a finite output pulse series of optical output pulses via the package i/o fiber in response to input thereto of one or more interrogating optical pulses. The array further comprises a fiber-optic bus (104,106, 108, 110) extending along the length of the line array, each package i/o fiber being optically coupled to the fiber-optic bus at a respective positions along the line array. The array allows interrogation at a higher frequency than is the case for a serial array of the same number of fiber-optic sensing packages.
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公开(公告)号：US20110139538A1
公开(公告)日：2011-06-16
申请号：US13059806
申请日：2009-08-20
IPC分类号： G01S15/00
摘要： Methods and apparatus for tracking objects in conduits, especially for tracking the movement of a pig in a pipeline, are disclosed. Distributed acoustic sensing is used to obtain signal returns from a plurality of discrete longitudinal sensing portions of a fibre optic cable which is laid along the length of the conduit. The method involves detecting an acoustic signature corresponding to the object moving in the conduit. The acoustic signature may comprise a series of pressure pulses caused by the object traversing joints etc. in the conduit. Preferably the method involves detecting pressure waves caused by the object as it moves through the conduit. Detecting the characteristic pressure wave signal provides discrimination of the object from other acoustic disturbances. In pipeline applications a pig can be tracked in real time, if the pig stops moving an alert can be generated and the location of the pig will be known.
摘要翻译： 公开了用于跟踪管道中的物体的方法和装置，特别是用于跟踪管道中的猪的运动。 分布式声学感测用于从沿着导管长度放置的光纤电缆的多个离散的纵向感测部分获得信号返回。 该方法涉及检测对应于在导管中移动的对象的声学签名。 声学特征可以包括由导管中的物体横穿接头等引起的一系列压力脉冲。 优选地，该方法包括检测由物体在通过导管移动时引起的压力波。 检测特征压力波信号提供对象与其他声学干扰的区别。 在管道应用中，可以实时跟踪猪，如果猪停止移动，则可以产生警报，并且知道猪的位置。
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公开(公告)号：US20110069302A1
公开(公告)日：2011-03-24
申请号：US12883755
申请日：2010-09-16
摘要： A method for monitoring for seismic events by interrogating an optic fibre which forms part of an existing communications infrastructure to provide distributed acoustic sensing (DAS). The signals provided by the distributed sensing provide measurements at each of a plurality of discrete portions along the fibre, which may be many tens of kilometres in length. Warning or measurement and consequently prediction of seismic activity can be provided by collecting data over a wide area, without the need to deploy a correspondingly large fibre network.
摘要翻译： 通过询问形成现有通信基础设施的一部分以提供分布式声学感测（DAS）的光纤来监测地震事件的方法。 由分布式感测提供的信号在沿着光纤的多个离散部分中的每一个处提供测量，其长度可以是数十公里。 可以通过在广泛的区域收集数据来提供地震活动的警告或测量，从而预测地震活动，而无需部署相应的大型光纤网络。
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公开(公告)号：US07440644B2
公开(公告)日：2008-10-21
申请号：US10506559
申请日：2003-03-03
申请人： Jonathan James Westhall , David John Hill , William Malcolm Babb , Philip John Nash , Steven Robert Thomson
发明人： Jonathan James Westhall , David John Hill , William Malcolm Babb , Philip John Nash , Steven Robert Thomson
摘要： An optical sensor assembly comprising a plurality of optical fibre sensor coils optically coupled by optical fibre; and an elongate support element, on which said plurality of optical fibre sensor coils and optically coupling optical fibre are mounted is disclosed. The support element has an elastic limit such that when said support element is bent from the elongate axis, the optical fibre fracture limit is reached before the elastic limit is reached. An array of these optical sensor assemblies, the mandrel on which the sensing coils are mounted and their method of manufacture are also disclosed.
摘要翻译： 一种光学传感器组件，包括通过光纤光耦合的多个光纤传感器线圈; 并且公开了一种细长的支撑元件，其上安装有所述多个光纤传感器线圈和光学耦合光纤。 支撑元件具有弹性极限，使得当所述支撑元件从细长轴线弯曲时，在达到弹性极限之前达到光纤断裂极限。 还公开了这些光学传感器组件的阵列，其上安装有感测线圈的心轴及其制造方法。
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公开(公告)号：US09677956B2
公开(公告)日：2017-06-13
申请号：US13509425
申请日：2010-11-11
IPC分类号： G02B6/02 , G01N9/00 , G01N21/47 , G01L1/24 , G01D5/353 , G01H9/00 , G01L11/02 , G02B6/44 , G02B6/032
CPC分类号： G01L1/243 , G01D5/3538 , G01H9/004 , G01L11/025 , G01V1/208 , G01V1/52 , G02B6/02 , G02B6/443 , G02B2006/0325
摘要： Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) and surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximised compared with the core being located at the center of the cable.
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公开(公告)号：US09631972B2
公开(公告)日：2017-04-25
申请号：US13509407
申请日：2010-11-11
CPC分类号： G01H9/004 , G01S3/8083 , G01S5/22
摘要： Techniques for determining lateral offset of the source of an acoustic disturbance in a distributed acoustic fiber optic sensor are described. The sensor comprises an optical source (112) for interrogating an optical fiber (104) and a detector (116) and processor (108) arranged to detect any backscattered radiation and determine a measurement signal for a plurality of discrete longitudinal sensing portions of the optical fiber. The processor is also arranged to analyse the measurement signals to identify signals corresponding to the same acoustic wave arriving at different parts of the fiber and determine from the time of arrival of said acoustic wave the direction and/or distance of the origin of said acoustic wave from the optical fiber. The geometry of the fiber may be arranged to ensure that any positional ambiguity can be resolved and the use of multiple fibers (501, 502) is disclosed.
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公开(公告)号：US09459329B2
公开(公告)日：2016-10-04
申请号：US13819253
申请日：2011-08-31
IPC分类号： G01R33/032 , G02B6/44
CPC分类号： G01R33/0327 , G02B6/4401
摘要： There is provided a system (100) for magnetic field detection, comprising a fiber optic interrogator (104) adapted to interrogate a first length of optical fiber (102) with interrogating radiation, detect radiation backscattered from said optical fiber and analyze said detected radiation to provide distributed sensing indicative of mechanical disturbances of said optical, wherein the optic fiber is mechanically coupled to a material whose dimensions vary dependent on applied magnetic field. Changes in dimensions of the optic fiber as can be detected by virtue of changes in back-scattering of light from said fiber using the principles of fiber optic distributed acoustic sensing.
摘要翻译： 提供了一种用于磁场检测的系统（100），包括：光纤询问器（104），用于询问具有询问辐射的第一长度的光纤（102），检测从所述光纤反向散射的辐射，并将所述检测到的辐射分析到 提供指示所述光学器件的机械干扰的分布式感测，其中所述光纤机械耦合到其尺寸根据所施加的磁场而变化的材料。 通过光纤分布式声学传感的原理，可以通过来自所述光纤的光的反向散射的变化来检测光纤尺寸的变化。
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公开(公告)号：US09416644B2
公开(公告)日：2016-08-16
申请号：US13988839
申请日：2011-11-30
CPC分类号： E21B47/101 , E21B43/26 , E21B43/267 , E21B47/123 , E21B49/00
摘要： This application relates to methods and apparatus for monitoring hydraulic fracturing in well formation and fracture characterization using distributed acoustic sensing (DAS). The method involves interrogating a optic fiber (102) arranged down the path of a bore hole (106) to provide a distributed acoustic sensor and also monitoring flow properties of fracturing fluid pumped (114) into the well. The acoustic data from the distributed acoustic sensor is processed together with the flow properties data to provide an indication of at least one fracture characteristic.
摘要翻译： 本申请涉及使用分布式声学传感（DAS）监测井形成和裂缝特征的水力压裂的方法和装置。 该方法包括询问沿钻孔（106）的路径布置的光纤（102），以提供分布式声学传感器，并且还监测泵送到井中的压裂流体（114）的流动性质。 来自分布式声学传感器的声学数据与流量特性数据一起被处理以提供至少一个断裂特征的指示。
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