专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO2016142695A1 METHOD AND APPARATUS FOR OPTICAL SENSING 审中-公开
标题翻译：光学感测方法与装置
公开(公告)号：WO2016142695A1
公开(公告)日：2016-09-15
申请号：PCT/GB2016/050625
申请日：2016-03-07
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom , SHATALIN, Sergey
IPC分类号： G01D5/353 , G01H9/00
CPC分类号： G01D5/35374 , G01D5/35306 , G01D5/3537 , G01H9/004
摘要： Embodiments of the invention provide an improved optical fiber distributed acoustic sensor system that makes use of a specially designed optical fiber to improve overall sensitivity of the system, in some embodiments by a factor in excess of 10. This is achieved by inserting into the fiber weak broadband reflectors periodically along the fiber. The reflectors reflect only a small proportion of the light from the DAS incident thereon back along the fiber, typically in the region of 0.001% to 0.1%, but preferably around 0.01% reflectivity per reflector. In addition, to allow for temperate compensation to ensure that the same reflectivity is obtained if the temperature changes, the reflection bandwidth is relatively broadband i.e. in the region of +/- 3nm from the nominal laser wavelength. In some embodiments the reflectors are formed from a series of fiber Bragg gratings, each with a different center reflecting frequency, the reflecting frequencies and bandwidths of the gratings being selected to provide the broadband reflection. In other embodiments a chirped grating may also be used to provide the same effect. In preferred embodiments, the reflectors are spaced at half the gauge length i.e. the desired spatial resolution of the optical fiber DAS.
摘要翻译：本发明的实施例提供了一种改进的光纤分布式声学传感器系统，其利用专门设计的光纤来改善系统的总体灵敏度，在一些实施例中是超过10倍。这是通过将光纤插入到弱纤维宽带反射器周期性地沿着光纤。反射镜仅反射沿着光纤在其上反射的DAS的光的一小部分，通常在每个反射器的0.001％至0.1％的范围内，优选地为约0.01％的反射率。此外，为了允许温和补偿以确保如果温度改变，获得相同的反射率，则反射带宽相对较宽，即距离标称激光波长+/- 3nm的区域。在一些实施例中，反射器由一系列光纤布拉格光栅形成，每个具有不同的中心反射频率，选择光栅的反射频率和带宽以提供宽带反射。在其他实施例中，也可以使用啁啾光栅来提供相同的效果。在优选实施例中，反射器间隔开量程长度的一半，即光纤DAS的期望空间分辨率。

2. 发明申请

WO2015036735A1 NON-ISOTROPIC ACOUSTIC CABLE 审中-公开
标题翻译：非等级声学电缆
公开(公告)号：WO2015036735A1
公开(公告)日：2015-03-19
申请号：PCT/GB2014/052679
申请日：2014-09-04
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , FINFER, Daniel , STRUSEVICH, Dmitry , SHATALIN, Sergey , PARKER, Tom
IPC分类号： G01H9/00 , E21B47/12 , G01D5/353 , G01L1/24
CPC分类号： G01H9/004 , G01L1/242 , G01M7/00 , G02B6/4405 , G02B6/4415
摘要： Embodiments of the present invention address aliasing problems by providing a plurality of discrete acoustic sensors along a cable whereby acoustic signals may be measured in situations where the fibre optic cable has not been secured to a structure or area by a series of clamps, as described in the prior art. Acoustic sampling points are achieved by selectively enhancing the acoustic coupling between the outer layer and the at least one optical fibre arrangement, such that acoustic energy may be transmitted selectively from the outer layer to the at least one optical fibre arrangement. The resulting regions of acoustic coupling along the cable allow the optical fibre to detect acoustic signals. Regions between the outer layer and the at least one optical fibre arrangement that contain material which is acoustically insulating further this enhancement since acoustic waves are unable to travel through such mediums, or at least travel through such mediums at a reduced rate.
摘要翻译：本发明的实施例通过沿着电缆提供多个离散的声学传感器来解决混叠问题，从而可以在光纤电缆未通过一系列夹具固定到结构或区域的情况下测量声信号，如现有技术通过选择性地增强外层和至少一个光纤布置之间的声耦合来实现声学采样点，使得声能可以从外层选择性地传输到至少一个光纤装置。所产生的沿着电缆的声耦合区域允许光纤检测声信号。外层和至少一个光纤布置之间的区域包含进一步声学绝缘的材料，因为声波不能穿过这种介质，或至少以降低的速率行进通过这种介质。

3. 发明申请

WO2021165700A1 LONG RANGE OPTICAL FIBER SENSING SYSTEMS 审中-公开
公开(公告)号：WO2021165700A1
公开(公告)日：2021-08-26
申请号：PCT/GB2021/050424
申请日：2021-02-19
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom , SHATALIN, Sergey , MAXWELL, Jack
IPC分类号： G01D5/353 , G01H9/00 , G01K11/32 , G01L1/24 , G01V1/20 , G01V1/22 , G01V1/42 , E21B47/07
摘要： A long range optical fiber sensor such as a distributed acoustic sensor has a sensing fiber located remotely from the interrogator, with a length of transport fiber path connecting the two. Because no sensing is performed on the transport fiber then the pulse repetition rate from the interrogator can be high enough such that the pulse repetition rate and pulse power are optimised according to the sensing fiber length and hence sensing frequency response and sensitivity are also optimised according to the sensing fiber length. In further embodiments fiber amplifiers such as erbium doped fiber amplifiers may be included in line in the transport fiber path, typically located just before the sensing fiber in the direction of pulse travel from the interrogator, to help restore the pulse signal power before it enters the sensing fiber. In yet further embodiments at least one Raman pump source can be provided to inject light pulses on to the transport fiber at a Raman pump wavelength to stimulate the generation of signal photons at the interrogator pulse wavelength via the stimulated Raman scattering (SRS) phenomenon. This helps to maintain the forward pulses and backscatter/reflection signals as they traverse the transport fiber path to and from the sensing fiber.

4. 发明申请

WO2018127708A1 METHOD AND APPARATUS FOR OPTICAL SENSING 审中-公开
公开(公告)号：WO2018127708A1
公开(公告)日：2018-07-12
申请号：PCT/GB2018/050027
申请日：2018-01-05
申请人： SILIXA LTD. , CHEVRON U.S.A. INC.
发明人： SHATALIN, Sergey , DAJCZGEWAND, Julian , FARHADIROUSHAN, Mahmoud , PARKER, Tom
IPC分类号： G01D5/353 , G01H9/00
摘要： Embodiments of the invention provide an improved optical fiber distributed acoustic sensor system that makes use of an optical fiber having reflector portions distributed along its length in at least a first portion. In particular, in order to increase the spatial resolution of the sensor system to the maximum, the reflector portions are positioned along the fiber separated by a distance that is equivalent to twice the distance an optical pulse travels along the fiber in a single sampling period of the data acquisition opto-electronics within the sensor system. As such, no oversampling of the reflections of the optical pulses from the reflector portions is undertaken, which means that it is important that the sampling points for data acquisition in the sensor system are aligned with the reflections that arrive at the sensor system from along the sensing fiber. In order to ensure such alignment, adaptive delay componentry may be used to adaptively align the reflected optical signals (or their electrical analogues) with the sampling points. Alternatively, control over the sampling points can also be undertaken to re-synchronise the sampling points with the returning reflections. In addition, in order to allow higher speed sampling to be undertaken, reflection equalisation componentry may also be used to reduce the dynamic range of the returning reflections.

5. 发明申请

WO2017009606A1 IMPROVED SENSITIVITY OPTICAL FIBER SENSING SYSTEMS 审中-公开
标题翻译：改进的灵敏度光纤传感系统
公开(公告)号：WO2017009606A1
公开(公告)日：2017-01-19
申请号：PCT/GB2016/052050
申请日：2016-07-07
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom , SHATALIN, Sergey
IPC分类号： G01D5/26 , G01D5/353
CPC分类号： G01D5/3537 , G01D5/268 , G01D5/353
摘要： Embodiments of the invention provide optical fiber sensing systems (70) wherein sensitivity is increased by the provision of multiple parallel-connected sensing fibers (76). The fibers (76) are in some embodiments substantially contiguous to each other along the sensing parts of their lengths, for example by being incorporated into a common cable or the like. That is, the fibers in some embodiments run substantially parallel to each other and/or are further arranged such that incident energy at a particular location is incident upon known corresponding sections of the respective fibers substantially simultaneously. The provision of multiple fibers allows for multiple backscatter or reflection signals to be generated in response to a particular event to be sensed, the multiple backscatter or reflection signals pertaining to the same event to be sensed (e.g. temperature change, or incident acoustic energy) being combined together to provide for a greater overall signal for inputting into an optical fiber sensing system for processing. The multiple sensing fibers also permit the optical fiber sensing system to output optical signals for inputting into the fibers, typically as optical pulses, of a greater power than would otherwise be possible without entering the domain of non-linear fiber responses. This is because the output signal is divided between the plurality of sensing fibers, and hence the individual optical signal into each sensing fiber remains within the linear response region. However, the overall backscatter and/or reflections that is/are generated and upon which sensing is based are increased in line with the overall increase in signal power, and hence overall the signal to noise ratio of the system is increased.
摘要翻译：本发明的实施例提供了通过提供多个并联连接的感测光纤（76）来提高灵敏度的光纤传感系统（70）。在一些实施例中，纤维（76）沿其长度的感测部分彼此基本上相邻，例如通过结合到公共电缆等中。也就是说，在一些实施例中，纤维基本上彼此平行地延伸和/或进一步布置成使得特定位置处的入射能量基本上同时入射到相应纤维的已知相应部分上。提供多个光纤允许响应于要感测的特定事件而产生多个反向散射或反射信号，与要感测的相同事件（例如温度变化或入射声能）相关的多个后向散射或反射信号是组合在一起以提供更大的总信号，用于输入到用于处理的光纤感测系统中。多个感测光纤还允许光纤感测系统输出光信号，用于输入光纤（通常为光脉冲），其功率大于否则不会进入非线性光纤响应域的情况下将更大的功率。这是因为在多个感测光纤之间分配输出信号，因此到每个感测光纤中的各个光信号保持在线性响应区域内。然而，根据信号功率的总体增加，生成并且基于感测的反向散射和/或反射增加，因此总体上增加了系统的信噪比。

6. 发明申请

WO2010136810A3 METHOD AND APPARATUS FOR OPTICAL SENSING 审中-公开
公开(公告)号：WO2010136810A3
公开(公告)日：2010-12-02
申请号：PCT/GB2010/050889
申请日：2010-05-27
申请人： SILIXA LTD , FARHADIROUSHAN, Mahmoud , PARKER, Tom Richard , SHATALIN, Sergey
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom Richard , SHATALIN, Sergey
IPC分类号： G01D5/353
摘要： The present invention provides novel apparatus and methods for fast quantitative measurement of perturbation of optical fields transmitted, reflected and/or scattered along a length of an optical fibre. The present invention can be used for point sensors as well as distributed sensors or the combination of both. In particular this technique can be applied to distributed sensors while extending dramatically the speed and sensitivity to allow the detection of acoustic perturbations anywhere along a length of an optical fibre while achieving fine spatial resolution. The present invention offers unique advantages in a broad range of acoustic sensing and imaging applications. Typical uses are for monitoring oil and gas wells such as for distributed flow metering and/or imaging, seismic imaging, monitoring long cables and pipelines, imaging within large vessel as well as for security applications.

7. 发明申请

WO2017203271A1 METHOD AND APPARATUS FOR OPTICAL SENSING 审中-公开
标题翻译：用于光学感测的方法和设备
公开(公告)号：WO2017203271A1
公开(公告)日：2017-11-30
申请号：PCT/GB2017/051496
申请日：2017-05-25
申请人： SILIXA LTD
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom , SHATALIN, Sergey
IPC分类号： G01D5/353
CPC分类号： G01D5/35316
摘要： In one embodiment a multi-wavelength distributed optical fiber sensing system is provided, having reflectors disposed along the sensing fiber to define sensing regions for which individual signals can be resolved. The reflectors are typically Bragg gratings, and have a reflection characteristic having a main reflection lobe at a central wavelength, and smaller reflection side lobes with less reflectivity at a plurality of smaller and/or higher wavelengths. A filtering arrangement is provided to filter out light at the central wavelength on both the forward and return paths to and from the fiber, so that it does not swamp light at the sidelobe wavelengths. Multiple light sources and optical processing systems can then be provided, adapted to operate at the sidelobe wavelengths, which wavelengths are only weakly reflected from the reflectors. As a consequence, an optical fiber sensing system is obtained that allows for simultaneous multi-wavelength sensing operation (at the side-lobe wavelengths) from along the same sensing fiber.
摘要翻译：在一个实施例中，提供了一种多波长分布式光纤传感系统，其具有沿传感光纤设置的反射器，以限定能够分辨各个信号的传感区域。反射器通常是布拉格光栅，并且具有反射特性，其具有在中心波长处的主反射波瓣，以及在多个较小和/或较高波长处具有较少反射率的较小反射侧波瓣。提供了滤波装置，以过滤出去往和来自光纤的前向路径和返回路径上的中心波长的光，使得其不会在旁瓣波长处淹没光。然后可以提供多个光源和光学处理系统，适合于在旁瓣波长下工作，该波长仅从反射器弱反射。结果，获得了允许沿同一传感光纤同时进行多波长传感操作（在旁瓣波长处）的光纤传感系统。

8. 发明申请

WO2016030667A1 FLEXIBLE SUBSTRATE FIBER OPTIC SENSING MAT FOR DISTRIBUTED ACOUSTIC SENSING 审中-公开
标题翻译：用于分布式声学感应的柔性基板光纤传感垫
公开(公告)号：WO2016030667A1
公开(公告)日：2016-03-03
申请号：PCT/GB2015/052425
申请日：2015-08-20
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , MAHUE, Veronique , PARKER, Tom , SHATALIN, Sergey
IPC分类号： G01H9/00 , G01D5/353
CPC分类号： G01H9/004 , G01D5/35358
摘要： A prefabricated mat-like structure having lengths of fiber mounted thereon or therein in a predetermined deployment pattern that provides a high spatial density of fiber to give increased spatial sensing resolution is described. The prefabricated mat-like structures may be very easily deployed by being placed against and/or wrapped around an object to be monitored, typically being fastened in place by clamps or the like. In addition, easy removal from the object is also obtained, by simply unfastening the mat- like structure, which may then be redeployed elsewhere. The prefabricated mat-like structure having the fiber already mounted thereon or therein therefore provides a very convenient and easily installable and removable solution
摘要翻译：描述了一种具有安装在其上或其中的纤维长度的预制垫状结构，其中预定展开图案提供高空间密度的纤维以提供增加的空间感测分辨率。预制的垫状结构可以通过被放置在被监视物体上和/或缠绕在被监视物体上而非常容易地部署，通常通过夹具等紧固到位。此外，通过简单地松开垫状结构，也可以从物体中轻松取出，然后将其重新部署到其他地方。具有已经安装在其上的纤维的预制垫状结构因此提供了非常方便和易于安装和可移除的解决方案

9. 发明申请

WO2015056012A1 OPTICAL FIBER CABLE 审中-公开
标题翻译：光纤电缆
公开(公告)号：WO2015056012A1
公开(公告)日：2015-04-23
申请号：PCT/GB2014/053100
申请日：2014-10-15
申请人： SILIXA LTD.
发明人： FARHADIROUSHAN, Mahmoud , FINFER, Daniel , MAHUE, Veronique , PARKER, Tom , SHATALIN, Sergey , STRUSEVICH, Dmitry
IPC分类号： G01D5/353
CPC分类号： G01F1/661 , G01D5/3537 , G02B6/4415
摘要： Embodiments of the present invention provide a cable for optical fiber sensing applications formed from fiber wound around a cable core. A protective layer is then preferably placed over the top of the wound fiber, to protect the fiber, and to help keep it in place on the cable core. The cable core is preferably of a diameter to allow bend-insensitive fiber to be wound thereon with low bending losses. The effect of winding the fiber onto the cable core means that the longitudinal sensing resolution of the resulting cable is higher than simple straight fiber, when the cable is used with an optical fiber sensing system such as a DAS or DTS system. The achieved resolution for the resulting cable is a function of the fiber winding diameter and pitch, with a larger diameter and reduced winding pitch giving a higher longitudinal sensing resolution.
摘要翻译：本发明的实施例提供了一种用于光纤传感应用的电缆，其由围绕电缆芯的纤维缠绕形成。然后优选将保护层放置在缠绕光纤的顶部上方，以保护光纤，并帮助将其保持在电缆芯上的适当位置。电缆芯优选具有允许弯曲不敏感纤维以低弯曲损耗缠绕在其上的直径。将光纤缠绕到电缆芯上的效果意味着当电缆与诸如DAS或DTS系统的光纤传感系统一起使用时，所得电缆的纵向感测分辨率高于简单的直线光纤。所得到的电缆的分辨率是光纤绕组直径和间距的函数，具有较大的直径和减小的绕组间距，从而提供更高的纵向感测分辨率。

10. 发明申请

WO2010136809A3 OPTICAL SENSOR AND METHOD OF USE 审中-公开
公开(公告)号：WO2010136809A3
公开(公告)日：2010-12-02
申请号：PCT/GB2010/050888
申请日：2010-05-27
申请人： SILIXA LTD , FARHADIROUSHAN, Mahmoud , PARKER, Tom, Richard , SHATALIN, Sergey
发明人： FARHADIROUSHAN, Mahmoud , PARKER, Tom, Richard , SHATALIN, Sergey
IPC分类号： G01D5/353
摘要： An interferometer apparatus for an optical fibre system and method of use is described. The interferometer comprises an optical coupler and optical fibres which define first and second optical paths. Light propagating in the first and second optical paths is refelected back to the optical coupler to generate an interference signal. First, second and third interference signal components are directed towards respective first, second and third photodetectors. The third photodetector is connected to the coupler via a non-reciprocal optical device and is configured to measure the intensity of the third interference signal component directed back towards the input fibre. Methods of use in applications to monitoring acoustic perturbations and a calibration method are described.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式