Velocimeters
    1.
    发明授权
    Velocimeters 失效
    速度计

    公开(公告)号:US5351116A

    公开(公告)日:1994-09-27

    申请号:US961905

    申请日:1993-01-06

    CPC分类号: G01P3/366 G01P5/26

    摘要: A differential laser Doppler velocimeter is based on the use of a modified fibre optic Sagnac Interferometer 1,2. The interferometer phase is dependent not on the target displacement, but on its velocity. The output intensity of the interferometer may be modulated by control means PC which controls loop birefringence introducing a phase bias and polarization offset between counter-propagating beams.

    摘要翻译: PCT No.PCT / GB91 / 01114 Sec。 371日期:1993年1月6日 102(e)日期1993年1月6日PCT PCT 1991年7月8日PCT公布。 出版物WO92 / 01230 日期:1992年1月23日。差分激光多普勒测速仪基于使用改进的光纤Sagnac干涉仪1,2。 干涉仪相位不依赖于目标位移,而是依赖于其速度。 干涉仪的输出强度可以由控制装置PC调节,控制装置PC控制环路双折射,引入反向传播波束之间的相位偏置和偏振偏移。

    Sensor system for measurement of temperature or strain
    2.
    发明授权
    Sensor system for measurement of temperature or strain 失效
    用于测量温度或应变的传感器系统

    公开(公告)号:US5721615A

    公开(公告)日:1998-02-24

    申请号:US591475

    申请日:1996-01-25

    摘要: A sensor system in an interferometric arrangement has a sensor arm and a reference arm. The reference arm is in a stable environment and the sensor arm is arranged to be subject to variations in strain and/or temperature. Radiation from a broadband source propagates through the arrangement and a broadband interferogram is generated as an air gap is scanned. The interferogram is recorded on an oscilloscope and analyzed using signal processing software on a computer. From the analysis the changes in group delay and optical dispersion of the light in the sensor arm due to strain and temperature changes is measured, and values for the strain and/or temperature changes calculated. A narrowband light source may be used for accurate calibration of path length differences during scanning. The strain and temperature on the sensor arm may be calibrated or tested using clamps and a thermal enclosure. The system may also be configured in a tandem interferometry arrangement including a sensing interferometer and reference interferometer.

    摘要翻译: PCT No.PCT / GB94 / 01388 Sec。 371日期:1996年1月25日 102(e)日期1996年1月25日PCT Filed 1994年6月27日PCT Pub。 公开号WO95 / 02802 日期1995年1月26日干涉仪中的传感器系统具有传感器臂和参考臂。 参考臂处于稳定的环境中,并且传感器臂被布置成经受应变和/或温度的变化。 宽带源的辐射通过该布置传播,并且当扫描气隙时产生宽带干涉图。 干涉图记录在示波器上,并使用计算机上的信号处理软件进行分析。 从分析中,测量由于应变和温度变化导致的传感器臂中的光延迟和光学色散的变化,并且计算应变和/或温度变化的值。 可以使用窄带光源来精确校准扫描期间的路径长度差异。 传感器臂上的应变和温度可以使用夹具和热外壳进行校准或测试。 该系统还可以被配置成包括感测干涉仪和参考干涉仪的串联干涉测量装置。

    Interferometric sensor
    3.
    发明授权
    Interferometric sensor 失效
    干涉传感器

    公开(公告)号:US4725143A

    公开(公告)日:1988-02-16

    申请号:US845136

    申请日:1986-02-27

    IPC分类号: G01B9/02 G01D5/34 G01K11/32

    CPC分类号: G01D5/344 G01K11/32

    摘要: An interferometric sensor includes an optical fiber 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.

    摘要翻译: PCT No.PCT / GB85 / 00289 Sec。 371日期1986年2月27日 102(e)日期1986年2月27日PCT提交1985年6月28日PCT公布。 公开号WO86 / 00402 日期:1986年1月16日。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光电探测器(9,11)同时监测的干扰输出信号 常规的,例如,迈克尔逊和偏振干涉仪布置。 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。

    Optical pressure sensing apparatus
    4.
    发明授权
    Optical pressure sensing apparatus 失效
    光压感测装置

    公开(公告)号:US4678909A

    公开(公告)日:1987-07-07

    申请号:US810324

    申请日:1985-11-25

    IPC分类号: G01D5/353 G01L11/02 G01B11/02

    CPC分类号: G01L11/025 G01D5/35303

    摘要: 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.

    摘要翻译: 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。

    Laser system method and apparatus for performing a material processing
operation and for indicating the state of the operation
    5.
    发明授权
    Laser system method and apparatus for performing a material processing operation and for indicating the state of the operation 失效
    用于执行材料处理操作并指示操作状态的激光系统方法和装置

    公开(公告)号:US5319195A

    公开(公告)日:1994-06-07

    申请号:US857070

    申请日:1992-03-24

    摘要: A laser system comprises a laser (500) whose output beam is delivered to a workpiece (504) by an optical fiber (502). A transducer (506) detects the power of light propagating in the cladding layer of fiber (502) at a position near its input end. The transducer (506) also strips out the light travelling in the cladding layer. The output of transducer (506) is divided by the output of a transducer (507), which detects the power of the output beam of laser (500), to produce a signal indicative of misalignment between the laser beam and the core of fiber (502) at the input face. A transducer (505) comprises a second fiber (508) optically coupled with the cladding layer of fiber (502). Light emitted from the ends of fiber (508) is detected by a pair of detectors (509, 510), whose outputs are indicated on displays (512, 514). Display (512) provides information on the integrity of transmissions of the laser beam through fiber (502). Display ( 514) provides information on the material processing operation performed on workpiece (504), and also on the focus of the beam onto the workpiece.

    摘要翻译: 激光系统包括其输出光束通过光纤(502)传送到工件(504)的激光器(500)。 换能器(506)在靠近其输入端的位置处检测在光纤(502)的包层中传播的光的功率。 换能器(506)也剥离在包层中行进的光。 换能器(506)的输出被检测激光器(500)的输出光束的功率的换能器(507)的输出除以产生指示激光束和光纤芯之间的未对准的信号( 502)。 换能器(505)包括与光纤(502)的包层光学耦合的第二光纤(508)。 从光纤(508)的端部发射的光由一对检测器(509,510)检测,其输出在显示器(512,514)上指示。 显示器(512)提供关于通过光纤(502)的激光束的透射的完整性的信息。 显示器(514)提供关于在工件(504)上执行的材料处理操作的信息,以及关于工件上的光束焦点的信息。

    Vortex shedding flowmeter
    6.
    发明授权
    Vortex shedding flowmeter 失效
    涡流流量计

    公开(公告)号:US4706502A

    公开(公告)日:1987-11-17

    申请号:US841527

    申请日:1986-02-27

    IPC分类号: G01F1/32

    CPC分类号: G01F1/3245

    摘要: 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 utilizes 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.

    摘要翻译: PCT No.PCT / GB85 / 00302 Sec。 371日期1986年2月27日 102(e)日期1986年2月27日PCT提交1985年7月5日PCT公布。 出版物WO86 / 00698 日本1986年1月30日。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电输出 信号对应于涡流脱落频率。 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。