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    • 1. 发明授权
    • Fiber optical interferometric temperature sensor with ramp modulation
    • 具有斜坡调制的光纤干涉式温度传感器
    • US4714342A
    • 1987-12-22
    • US684925
    • 1984-12-18
    • David A. JacksonMichael CorkeAlan D. Kersey
    • David A. JacksonMichael CorkeAlan D. Kersey
    • G01K11/32G01J5/38G01B9/02
    • G01K11/32
    • A temperature sensor comprises a single-mode all-fiber Michelson interferometer. The interferometer includes a bi-directional coupler and signal and reference fibers having mirrored ends. These two fibers are of unequal lengths to provide an optical path length in-balance and the signal fiber may have a metal temperature sensing probe at its mirrored end. The injection current of a laser light source for the interferometer is modulated with a ramping signal so that a linearly moving interference pattern is produced at the output by mixing of the reflected beams propagated in the signal and reference fibers. The interference pattern is monitored by a photodetector and electronic circuitry processes the output of the photodetector to determine the optical phase shift between the light beams propagated in the signal and reference fibers, which phase shift is dependent on expansion or contraction of the signal fiber with respect to the reference fiber and is therefore related to the temperature at the sensing probe.
    • PCT No.PCT / GB84 / 00138 Sec。 371日期1984年12月18日 102(e)1984年12月18日PCT PCT。1984年4月24日PCT公布。 公开号WO84 / 04385 日期1984年11月8日。温度传感器包括单模全光纤迈克尔逊干涉仪。 干涉仪包括双向耦合器以及具有镜像端的信号和参考光纤。 这两条光纤具有不相等的长度以提供平衡的光路长度,并且信号光纤在其镜像端可以具有金属温度感测探针。 用于干涉仪的激光光源的注入电流用斜坡信号调制,使得通过混合传播在信号和参考光纤中的反射光束在输出端产生线性移动的干涉图案。 干涉图案由光电检测器监测,并且电子电路处理光电检测器的输出以确定在信号和参考光纤中传播的光束之间的光学相移,该相移取决于信号光纤的扩展或收缩 与参考光纤相关,因此与感测探头的温度有关。
    • 2. 发明授权
    • Optical pressure sensing apparatus
    • 光压感测装置
    • US4678909A
    • 1987-07-07
    • US810324
    • 1985-11-25
    • David A. JacksonMichael CorkeAlan D. KerseyJulian D. C. Jones
    • David A. JacksonMichael CorkeAlan D. KerseyJulian D. C. Jones
    • G01D5/353G01L11/02G01B11/02
    • G01L11/025G01D5/35303
    • Optical pressure sensing apparatus comprises an optical fibre interferometer arranged to sense the movement of a pressure responsive element and produce an interference signal at its output which can be monitored and processed to measure changes in the pressure applied to the pressure responsive element. The interferometer comprises a signal arm coupled to the pressure responsive element and a fixed reference arm. A light source supplies light to the input of the interferometer via an optical fibre and monitoring and processing electronics connected to the output determine the optical phase shift between the light beams propagated in the signal and reference arms and produce a pressure reading.
    • PCT No.PCT / GB85 / 00136 Sec。 371日期:1985年11月25日 102(e)1985年11月25日日期PCT提交1985年4月1日PCT公布。 第WO85 / 04473号公报 日期:1985年10月10日。光学压力感测装置包括光纤干涉仪,其布置成感测压力响应元件的运动并在其输出处产生干涉信号,其可以被监视和处理,以测量施加到压力的压力的变化 响应元素 干涉仪包括耦合到压力响应元件的信号臂和固定的参考臂。 光源通过光纤向干涉仪的输入提供光,并且连接到输出的监视和处理电子器件确定在信号和参考臂中传播的光束之间的光学相移并产生压力读数。
    • 3. 发明授权
    • Polarimetric fibre sensor
    • 偏光纤传感器
    • US4642458A
    • 1987-02-10
    • US774589
    • 1985-09-05
    • David A. JacksonMichael CorkeAlan D. Kersey
    • David A. JacksonMichael CorkeAlan D. Kersey
    • G01D5/34G01K11/32G02F1/01
    • G01D5/344G01K11/32
    • A polarmetric fiber sensor comprises a lead fiber (1) and a shorter length of sensing fiber (2). Both fibers comprise higly birefringent optical fiber having orthogonal eigen modes and are spliced together with their eigen modes mutually rotated by 45.degree.. The sensing fiber (2) has a reflective distal end (6). Linearly polarized light from a laser source (3) is launched into one mode of the lead fiber (1) and light reflected from the distal end of the sensing fiber is recovered from the other mode of the lead fiber via a beam splitter (7) and photodiode (8). The resulting electrical signal produced by the photodiode (8) corresponds to the modal birefringence of the sensing fiber (2) and changes in this birefringence are monitored by processing means (9) to detect changes in a physical parameter sensed by the sensing fiber.
    • PCT No.PCT / GB85 / 00017 Sec。 371日期:1985年9月5日 102(e)1985年9月5日PCT 1985年1月18日PCT PCT。 出版物WO85 / 03124 日期:1985年7月18日。一种光纤传感器包括引线光纤(1)和较短长度的传感光纤(2)。 两根纤维均包含具有正交本征模的高双折射光纤,并将其本征模式相互旋转45度而拼接在一起。 感测光纤(2)具有反射的远端(6)。 来自激光源(3)的线偏振光发射到引导光纤(1)的一种模式中,并且从感测光纤的远端反射的光通过分束器(7)从引线光纤的另一种模式恢复, 和光电二极管(8)。 由光电二极管(8)产生的电信号对应于感测光纤(2)的模式双折射,并且通过处理装置(9)监视该双折射的变化,以检测由感测光纤感测到的物理参数的变化。
    • 5. 发明授权
    • Fiber optic power splitter
    • 光纤分离器
    • US5121452A
    • 1992-06-09
    • US532197
    • 1990-06-01
    • David W. StoweMichael Corke
    • David W. StoweMichael Corke
    • G02B6/28
    • G02B6/2856
    • Fiber optic power splitters having a central fiber and a selected number of surrounding fibers spaced periodically around the central fiber and the method of fabricating such splitters are described. For splitters having between three and five surrounding fibers, the central fiber is made to have a reduced diameter relative to the surrounding fibers so that it contacts each of the surrounding fibers and each of the surrounding fibers, likewise, touches each of its neighboring fibers. For splitters having seven or more surrounding fibers, the diameters of the surrounding fibers are reduced relative to the central fiber so that mutual contact is made among the set of equal diameter surrounding fibers and the central fiber. The equation governing the relative diameters of the central and surrounding fibers, and methods of obtaining uniform diameter reduction in an optical fiber are described. Single-mode splitters made according to these means have relatively low variation of splitting fraction with variations of input optical power wavelength and can be made to distribute optical power input in any fiber among, e.g. three to seventeen outputs according to predeterminable relationships. Of particular practical importance, splitters can be made which split one input into four, eight, twelve, or sixteen equal outputs, having a flattened response over a significant wavelength range.
    • 描述了具有中心纤维和围绕中心纤维周期性间隔的选定数量的周围纤维的光纤功率分配器和制造这种分离器的方法。 对于具有3-5个周围纤维的分离器,中心纤维相对于周围的纤维具有减小的直径,使得其与每个周围的纤维接触,并且每个周围的纤维同样接触其每个相邻的纤维。 对于具有七个或更多个周围纤维的分离器,相对于中心纤维,周围纤维的直径减小,使得在一组等直径的周围纤维和中心纤维之间形成相互接触。 描述了控制中心和周围纤维的相对直径的方程,以及获得光纤中均匀直径减小的方法。 根据这些方法制造的单模分离器具有相对低的分辨率分数随输入光功率波长变化的变化,并且可以使光纤功率输入在任何光纤中分布。 根据可预见的关系,三到十七个输出。 特别实际上重要的是,可以制造分离器,其将一个输入分成四个,八个,十二个或十六个相等的输出,在显着的波长范围内具有平坦的响应。
    • 6. 发明授权
    • Optical communication monitoring and control
    • 光通信监控
    • US5510917A
    • 1996-04-23
    • US417461
    • 1995-04-04
    • Michael CorkeDean A. WerthmanRobin M. MoranDavid W. StoweNeville J. RonanAmy R. Beaudet
    • Michael CorkeDean A. WerthmanRobin M. MoranDavid W. StoweNeville J. RonanAmy R. Beaudet
    • H04B10/077H04B10/079H04J14/02H04B10/08
    • H04J14/029H04B10/077H04B10/07953H04B10/07955H04J14/0279
    • For communicating over optical routes, route monitoring and protection are provided. In routes carrying signals on each of a number of wave lengths a tapped fraction of the signal is demultiplexed and an individual wave length is detected for determining performance and for triggering switching to alternative monitored routes carrying the same signal. Switching of all wave lengths if one shows faulty, with either a single wave length or all wave lengths being monitored is shown. Performance of a long wave length component is employed to determine route quality for shorter wave lengths as well. In bi-directional communication systems, performance of a wave length moving in one direction through a route determines route quality for transmission in the other direction, as well. Progressive sampling and digitization of the tapped signal and comparison to a digitized reference enables high sensitivity of monitoring. Detected average intensity of a tapped wave length, detected error rate in tapped wave lengths and use of performance data fed back from the receiver telecommunication equipment are used to control switching from one monitored route to another. In a unidirectional system, a wideband coupler at the transmitter is used both to merge signals at various wave lengths and to distribute energy at each of the wave lengths to each route.
    • 为了通过光路进行通信,提供路由监控和保护。 在多个波长中的每一个上携带信号的路由中,信号的抽头分数被解复用,并且检测单个波长以确定性能并且用于触发切换到携带相同信号的替代监视路由。 显示所有波长的切换,如果显示有故障,单个波长或被监测的所有波长。 使用长波长分量的性能来确定较短波长的路线质量。 在双向通信系统中,通过路线沿一个方向移动的波长的性能也决定了在另一个方向上传输的路由质量。 轻触信号的逐行采样和数字化以及与数字化参考的比较可实现高灵敏度的监控。 检测到的抽头波长的平均强度,抽头波长的检测误差率和使用从接收机电信设备反馈的性能数据,用于控制从一个被监控的路由到另一个的转换。 在单向系统中,发射机处的宽带耦合器被用于合并各种波长的信号,并且在每个波长的每个路径上分配能量。