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    • 8. 发明申请
    • FIBER OPTIC POWER SPLITTER
    • 光纤分离器
    • WO1991019214A1
    • 1991-12-12
    • PCT/US1991003873
    • 1991-06-03
    • ASTER CORPORATIONSTOWE, David, W.CORKE, Michael
    • ASTER CORPORATION
    • G02B06/26
    • G02B6/2856
    • Fiber optic splitters having a central fiber (18, 21) and a selectable number of surrounding fibers (10, 20) with mutual contact among the surrounding fibers and central fiber, formed preferably of identical diameter starting fibers. According to a formula, between three and five surrounding fibers, the central fiber (18, 21) has a reduced diameter, while for seven or more surrounding fibers, the diameters of the surrounding fibers are reduced. Splitters with one input and four, eight, twelve, or sixteen equal outputs, having a flattened wavelength response are provided. Means are provided to reduce detrimental phase mismatch at the desired coupling ratio as by substantially matching the propagation constants of the central and surrounding fibers in the finished coupler. Provisions for sufficiently matching the propagation constants include making the fused splitter region short; starting with fibers having differing propagation constants selected so the difference is diminished during fusing; fusing the fibers together to the extent that there are substantially no interstitial voids in the coallesced fiber mass; and surrounding the surrounding fibers (10, 20) with a transparent substance having the effect of cladding. For the latter purpose, a tube (11) or transparent optical rods assembled about the surrounding optical fibers are fused therewith, or the transparent substance is a moldable substance applied after the fused region of the coupler has been formed.
    • 9. 发明申请
    • POLARIMETRIC FIBER SENSOR
    • 极性光纤传感器
    • WO1985003124A1
    • 1985-07-18
    • PCT/GB1985000017
    • 1985-01-14
    • KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITEDJACKSON, David, AlfredCORKE, MichaelKERSEY, Alan, David
    • KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED
    • G01D05/26
    • G01D5/344G01K11/32
    • 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.
    • 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。
    • 10. 发明申请
    • OPTICAL DISPLACEMENT SENSING APPARATUS
    • 光学位移传感装置
    • WO1983003010A1
    • 1983-09-01
    • PCT/GB1983000055
    • 1983-02-24
    • KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITEDJACKSON, David, AlfredCORKE, MichaelKERSEY, Alan, David
    • KENT SCIENTIFIC AND INDUSTRIAL PROJECTS LIMITED
    • G01P15/08
    • G01P15/093G01B2290/25
    • An optical displacement sensing apparatus comprises a confocal Fabry-Perot interferometer (1) in which one of the confocal mirrors (6) is mounted on a resilient diaphragm (8), which is attached to a housing (2) supporting the other mirror (3), so that the mirrors are relatively movable in response to an external stimulus applied to the interferometer. The position of the mirror (3) is variable by a piezoelectric element (4), and a servo unit (16) is responsive to the optical output from the interferometer (1) to apply a voltage signal to the piezoelectric element which opposes relative displacement of the mirrors by an external stimulus and tends to maintain the spacing between the mirrors constant. Hence, the servo unit produces a signal corresponding to the stimulus. Both the input light signal for illuminating the interferometer (1) and the output light signal may be transmitted via optical fibers (12, 15).
    • 光学位移感测装置包括共焦法布里 - 珀罗干涉仪(1),其中共焦焦镜(6)中的一个安装在弹性隔膜(8)上,弹性隔膜(8)附接到支撑另一个反射镜(3)的壳体(2) ),使得反射镜响应于施加到干涉仪的外部刺激而相对可移动。 反射镜(3)的位置可由压电元件(4)变化,伺服单元(16)响应于干涉仪(1)的光输出,向与压电元件相对的压电元件施加电压信号 的反射镜通过外部刺激并且趋向于保持反射镜之间的间隔恒定。 因此,伺服单元产生对应于刺激的信号。 用于照射干涉仪(1)的输入光信号和输出光信号都可以经由光纤(12,15)传输。