公开(公告)号：WO1990008962A1

公开(公告)日：1990-08-09

申请号：PCT/GB1990000133

申请日：1990-01-30

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  NEWSON, Trevor, Paul ,  GERGES, Awad, Samir

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01P15/08

CPC classification number: G01P15/093 ,  G01D5/268

Abstract: An optical displacement sensor, for example a vibration sensor or accelerometer, in which the relative displacement of a resilient sensing element, such as a diaphragm (5), in response to an external stimulus applied to the sensor, is detected by a Fabry-Perot interferometer (2), and in which one of the mirrors (6) of the interferometer is mounted on the sensing element and the other mirror is formed by the adjacent or distal end of an optical fibre (4) via which the interferometer is illuminated or energised. The means mounting the diaphragm, comprises a housing (1) which may be adapted to be coupled to the external stimulus to be sensed, and the optical fibre (4), which is preferably a mono-mode optical fibre, may also be supported by the housing in a capillary tube (7) so that its optical axis corresponds to the optical axis of the mirror. Another embodiment of the invention comprises a back-to-back configuration in which mirror image Fabry-Perot optical cavities are arranged on either side of a resilient diaphragm sensing element.

Abstract translation: 光学位移传感器，例如振动传感器或加速度计，其中响应于施加到传感器的外部刺激，诸如隔膜（5）的弹性感测元件的相对位移由法布里 - 珀罗 干涉仪（2），其中干涉仪的反射镜（6）中的一个安装在感测元件上，另一个反射镜由光纤（4）的相邻或远端形成，通过该光纤照射干涉仪或 通电。 安装隔膜的装置包括壳体（1），壳体（1）可适于耦合到待感测的外部刺激，并且光纤（4）（其优选地是单模光纤）也可以由 所述壳体处于毛细管（7）中，使得其光轴对应于所述反射镜的光轴。 本发明的另一实施例包括背对背配置，其中镜像法布里 - 珀罗光腔被布置在弹性膜片感测元件的任一侧上。

公开(公告)号：WO1985004473A1

公开(公告)日：1985-10-10

申请号：PCT/GB1985000136

申请日：1985-04-01

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  CORKE, Michael ,  KERSEY, Alan, David ,  JONES, Julian, David, Clayton

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01L11/00

CPC classification number: G01L11/025 ,  G01D5/35303

Abstract: Optical pressure sensing apparatus comprises an optical fibre interferometer (4) arranged to sense the movement of a pressure responsive element (3) and produce an interference signal at its output (20) which can be monitored and processed to measure changes in the pressure applied to the pressure responsive element. The interferometer comprises a signal arm (9) coupled to the pressure responsive element (3) and a fixed reference arm (10). A light source (16) supplies light to the input (19) of the interferometer via an optical fibre (17) and monitoring and processing electronics (22-32) connected to the output (20) determine the optical phase shift between the light beams propagated in the signal and reference arms (9, 10) and produce a pressure reading.

Abstract translation: 光学压力感测装置包括光纤干涉仪（4），其布置成感测压力响应元件（3）的运动，并在其输出端产生干涉信号（20），该信号可被监视和处理，以测量施加到 压力响应元件。 干涉仪包括耦合到压力响应元件（3）和固定参考臂（10）的信号臂（9）。 光源（16）经由光纤（17）向干涉仪的输入端（19）供应光，并且连接到输出端（20）的监视和处理电子设备（22-32）确定光束之间的光学相移 在信号和参考臂（9,10）中传播并产生压力读数。

公开(公告)号：WO1984004385A1

公开(公告)日：1984-11-08

申请号：PCT/GB1984000138

申请日：1984-04-24

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  CORKE, Michael ,  KERSEY, Alan, David

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01K11/00

CPC classification number: G01K11/32

Abstract: A temperature sensor comprises a single-mode all-fibre Michelson interferometer (2, 4-8). The interferometer includes a bi-directional coupler (4) and signal and reference fibers (5, 6) having mirrored ends (7). These two fibers (5, 6) are of unequal lengths to provide an optical path length in-balance and the signal fibre (5) has a metal temperature sensing probe (11) at its mirrored end. The injection current of a laser light source (1) for the interferometer is modulated with a ramping signal so that a linearly moving interference pattern is produced at the output (8) by mixing of the reflected beams propagated in the signal and reference fibers (5, 6). The interference pattern is monitored by a photodetector (9) and electronic circuitry processes the output of the photodetector to determine the optical phase shift between the reflect beams in the signal and reference fibers, which phase shift is dependent on expansion and contraction of the signal fibre with respect to the reference fibre and is therefore related to the temperature at the sensing probe (11).

Abstract translation: 温度传感器包括单模全光纤迈克尔逊干涉仪（2,4-8）。 干涉仪包括双向耦合器（4）和具有镜像端（7）的信号和参考光纤（5,6）。 这两个光纤（5,6）具有不等长度以提供光路长度平衡，并且信号光纤（5）在其镜像端具有金属温度感测探头（11）。 用于干涉仪的激光光源（1）的注入电流用斜坡信号进行调制，从而通过混合在信号中传播的反射光束和参考光纤（5）产生线性运动的干涉图案（8） ，6）。 干涉图案由光电检测器（9）监测，并且电子电路处理光电检测器的输出以确定信号和参考光纤中的反射光束之间的光学相移，该相移取决于信号光纤的扩展和收缩 因此与传感探头（11）的温度有关。

公开(公告)号：WO1984001242A1

公开(公告)日：1984-03-29

申请号：PCT/GB1983000235

申请日：1983-09-22

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  PARKER, Edward, Andrew ,  LANGLEY, Richard, Jonathan

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: H01Q15/00

CPC classification number: G02B5/204 ,  H01Q15/0013

Abstract: A frequency selective surface or dichroic structure has an array of elements (1) each of which comprises at least two substantially concentric symmetrical closed figures (2, 3). For example, the element array may be a regular array of identical double-squares. Other polygons, or ellipses, may alternatively be used as the closed figures. The closed figures may be formed as conductive paths on a dielectric substrate or, alternatively, the Babinet complement of such a structure may be used.

Abstract translation: 频率选择性表面或二向色结构具有元件阵列（1），每个元件包括至少两个基本上同心的对称封闭图形（2,3）。 例如，元素阵列可以是相同双方格的规则数组。 也可以使用其他多边形或椭圆形作为封闭图形。 闭合图形可以形成为介电衬底上的导电路径，或者可以使用这种结构的Babinet补码。

公开(公告)号：WO1987005762A1

公开(公告)日：1987-09-24

申请号：PCT/GB1987000176

申请日：1987-03-13

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  JONES, Julian, David, Clayton

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: H04B09/00

CPC classification number: H04B10/60 ,  G01D5/26 ,  H04B10/25 ,  H04B10/27 ,  H04B10/278

Abstract: Optical apparatus for use as an optical data bus comprises an optical source (2) for launching polarised light into an optically transparent dielectric medium (1), such as, a monomode optical fibre, a reference magneto-optic modulator (3) for producing a change in the polarisation state of the light beam guided within the dielectric medium by Faraday rotation, at least one signal magneto-optic modulator (4, 5, 6) located in proximity to the dielectric medium (1) such that the application of an electrical signal to the signal modulator produces a further change in the polarisation state of the light beam by Faraday rotation, thereby to encode a corresponding signal on the light beam, a detector assembly (9) for producing an electrical signal corresponding to the encoded light beam emerging from the dielectric medium (1), and a processor (10) for decoding the electrical signal from the detector (9) and providing an output uniquely determining the or each encoded signal. The processor (10) may be arranged to supply a servo feedback signal to the reference magneto-optic modulator (3) in orderto maintain the polarisation azimuth of the output light beam from the dielectric medium at a substantially constant angle of rotation. The feedback signal then contains the encoded information. The recovered signal from the or each signal modulator (4, 5, 6) describes the magnetic field at the signal modulator and, hence, the apparatus may also be used as a magnetometer or for the measurement of electrical current.

Abstract translation: 用作光数据总线的光学装置包括用于将偏振光发射到诸如单模光纤的光学透明电介质（1）中的光源（2），用于产生 通过法拉第旋转在电介质介质中引导的光束的偏振状态的变化;位于电介质介质（1）附近的至少一个信号磁光调制器（4,5,6），使得施加电 对信号调制器的信号通过法拉第旋转产生光束的偏振状态的进一步变化，从而对光束上的相应信号进行编码，用于产生对应于编码光束的电信号的检测器组件（9） 以及用于对来自检测器（9）的电信号进行解码并提供唯一地确定该或每个编码信号的输出的处理器（10）。 处理器（10）可以被布置成将伺服反馈信号提供给参考磁光调制器（3），以便以基本上恒定的旋转角度来保持来自电介质的输出光束的偏振方位角。 然后，反馈信号包含编码信息。 来自或每个信号调制器（4,5,6）的恢复的信号描述了信号调制器处的磁场，因此该装置也可以用作磁力计或用于测量电流。

公开(公告)号：WO1986000698A1

公开(公告)日：1986-01-30

申请号：PCT/GB1985000302

申请日：1985-07-05

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JONES, Julian, David, Clayton ,  JACKSON, David, Alfred ,  AKHAVAN, Leilabady, Pedram

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01F01/32

CPC classification number: G01F1/3245

Abstract: A flowmeter for measuring the velocity of fluid flow by monitoring the vortex shedding frequency of the fluid flow comprises a single mode optical fibre sensing element (1) for detecting vortex shedding and utilises interferometric techniques for producing an electrical output signal corresponding to the vortex shedding frequency. The sensing element (1) comprises at least part of the signal arm (2) of an interferometer (3) which also includes means (12) for deriving a reference signal from the illuminating light source (4). The flow induced oscillation of the sensing element (1) caused by vortex shedding produces modulations of the interferometer output which is monitored by a photodetector (14) which, in turn, produces a modulated electrical output signal which can be processed by a signal processing system (16-19) to identify the vortex shedding frequency and, hence, produce a measurement of the flow velocity.

Abstract translation: 用于通过监测流体流动的涡流脱落频率来测量流体流速的流量计包括用于检测涡流脱落的单模光纤传感元件（1），并利用干涉技术产生对应于涡流脱落频率的电输出信号 。 感测元件（1）包括干涉仪（3）的信号臂（2）的至少一部分，其还包括用于从照明光源（4）导出参考信号的装置（12）。 由涡旋脱落引起的感测元件（1）的流动引起的振荡产生由光电检测器（14）监测的干涉仪输出的调制，光电检测器（14）又产生调制的电输出信号，该调制的电输出信号可由信号处理系统 （16-19）来识别涡流脱落频率，从而产生流速的测量。

公开(公告)号：WO1984003299A1

公开(公告)日：1984-08-30

申请号：PCT/GB1984000057

申请日：1984-02-23

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  BURNS, Richard, George ,  SARKER, Jawed, Mansab

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: C12N11/08

CPC classification number: C12N11/08 ,  C12P19/14

Abstract: Enzymes for example cellulases are immobilised by complexing with polymers derived from quinones which polymers resemble humic polymers. Preferably the quinone is formed in the presence of the enzyme and self-polymerises to incorporate the enzyme. The resulting immobilised enzyme/polymer complex can be further stabilised by supports such as activated clays. The resulting immobilised enzyme complex is particularly suitable for incorporation in soil but can be used for other enzymatic processes.

公开(公告)号：WO1987004798A1

公开(公告)日：1987-08-13

申请号：PCT/GB1987000101

申请日：1987-02-11

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  AKHAVAN LEILABADY, Pedram ,  JONES, Julian, David, Clayton

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01R33/032

CPC classification number: G01R33/0322

Abstract: Interferometric apparatus for use as a data ring or detector of magnetic fields or electric currents, comprises an optical fibre loop (1), a solid state light source (2), a fibre optic directional coupler (3) and a photodiode detector (4). Input light from the light source (2) is polarised and amplitude-divided at the directional coupler (3) into two beams which propagate in opposite directions about the fibre loop (1). After propagating about the loop the two beams are coherently mixed at the directional coupler and the resulting optical interference signal is detected by the photodiode (4). One or more electrical data or signal coils (5, 6, 7) wound about the optical fibre of the loop (1) produce magnetic fields having components in the direction of the optical fibre, whereby the Faraday effect causes rotation of the polarisation azimuths of the counter-propagating beams within the fibre loop. When these azimuth modulated light beams arrive at the directional coupler (3) the resulting interference signal is detected by the photodiode (4) which produces an electrical signal which in turn is processed to recover signals generated by the data or signal coils (5, 6, 7).

Abstract translation: 用作磁场或电流的数据环或检测器的干涉仪包括光纤环路（1），固态光源（2），光纤定向耦合器（3）和光电二极管检测器（4） 。 来自光源（2）的输入光在定向耦合器（3）处被极化并分频成两个沿着光纤回路（1）沿相反方向传播的光束。 在围绕环路传播之后，两个光束在定向耦合器处被相干地混合，并且所得光学干涉信号由光电二极管（4）检测。 围绕环路（1）的光纤缠绕的一个或多个电气数据或信号线圈（5,6,7）产生在光纤的方向上具有成分的磁场，由此法拉第效应使得偏振方位角 光纤回路内的反向传播光束。 当这些方位角调制光束到达定向耦合器（3）时，所产生的干涉信号由光电二极管（4）检测，该光电二极管产生电信号，该电信号又被处理以恢复由数据或信号线圈（5,6）产生的信号 ，7）。

公开(公告)号：WO1986000402A1

公开(公告)日：1986-01-16

申请号：PCT/GB1985000289

申请日：1985-06-28

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JONES, Julian, David, Clayton ,  JACKSON, David, Alfred ,  CORKE, Michael

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01D05/26

CPC classification number: G01D5/344 ,  G01K11/32

Abstract: An interferometric sensor includes an optical fibre polarimetric sensing element (5) for detecting a required measurand and is configured so as to derive interference output signals, which are simultaneously monitored by photodetectors (9, 11), from both conventional, for example, Michelson, and polarimetric interferometer arrangements. The sensor therefore offers the high resolution of a conventional interferometer in conjunction with the increased dynamic range of a polarimetric device.

Abstract translation: 干涉测量传感器包括用于检测所需被测量的光纤偏振感测元件（5），并且被配置为导出由传统的例如迈克尔逊（Michelson）的光电探测器（9,11）同时监测的干扰输出信号， 和偏振干涉仪布置。 因此，传感器提供了传统干涉仪的高分辨率以及极化装置的增加的动态范围。

公开(公告)号：WO1985003124A1

公开(公告)日：1985-07-18

申请号：PCT/GB1985000017

申请日：1985-01-14

Applicant: KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED ,  JACKSON, David, Alfred ,  CORKE, Michael ,  KERSEY, Alan, David

Inventor： KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED

IPC: G01D05/26

CPC classification number: G01D5/344 ,  G01K11/32

Abstract: A polarmetric fiber sensor comprises a lead fiber (1) and a shorter length of sensing fiber (2). Both fibers comprise highly birefringent optical fiber having orthogonal eigen modes and are spliced together with their eigen modes mutually rotated by 45 . The sensing fiber (2) has a reflective distal end (6). Linearly polarised 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.

Abstract translation: 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，并将它们的本征模相互旋转45°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。