METHOD AND APPARATUS FOR OPTICAL STRAIN SENSING
    4.
    发明申请
    METHOD AND APPARATUS FOR OPTICAL STRAIN SENSING 审中-公开
    光敏感测方法与装置

    公开(公告)号:US20160054186A1

    公开(公告)日:2016-02-25

    申请号:US14932023

    申请日:2015-11-04

    CPC classification number: G01L1/246 G01D5/35306 G01K11/3206

    Abstract: Mechanical parameters of an object subjected to a force or condition are measured. A curved portion of a multicore optical fiber is attached to the object, and the multicore optical fiber includes a center core and plural off-center cores. A distributed, optically-based sensing technique is used to obtain information at each of multiple points along the curved portion from multiple ones of the cores of the multicore optical fiber. A curvature associated with the fiber attached to the object is determined using the information obtained from multiple ones of the cores. Strain information is obtained for the center core without having to obtain strain information for the off-center cores. Mechanical parameters are determined based on the strain information obtained for the center core and the curvature information obtained from the multiple ones of the cores.

    Abstract translation: 测量受到力或条件的物体的机械参数。 多芯光纤的弯曲部分附着在物体上,多芯光纤包括中心芯和多个偏心芯。 使用分布式的基于光学的感测技术来获得来自多芯光纤的多个核心的沿弯曲部分的多个点的信息。 使用从多个核心获得的信息确定与附接到对象的光纤相关联的曲率。 对于中心芯获得应变信息,而不必获得偏心芯的应变信息。 基于针对中心芯获得的应变信息和从多个芯获得的曲率信息来确定机械参数。

    METHODS AND APPARATUS FOR CALIBRATION FOR A FIBER OPTIC SHAPE SENSOR

    公开(公告)号:US20190234726A1

    公开(公告)日:2019-08-01

    申请号:US16307269

    申请日:2017-05-25

    Abstract: An interferometric measurement system measures a spun optical fiber sensor that includes multiple optical cores configured in the fiber sensor. A calibration machine includes a calibration fixture having known dimensions, one or more automatically controllable actuators for wrapping the fiber sensor starting at one end of the fiber sensor onto a calibration fixture having known dimensions, and an actuator controller configured to control the one or more actuators with actuator control signals. Interferometric detection circuitry, coupled to the actuator controller and to the other end of the fiber sensor, detects measured interferometric pattern data associated with each of the multiple cores when the fiber sensor is wrapped onto the calibration fixture. Data processing circuitry determines compensation parameters that compensate for variations between an optimal configuration of the multiple cores and an actual configuration of the multiple cores in the fiber sensor based on the detected measured interferometric pattern data. The compensation parameters compensate subsequently-obtained measurement interferometric pattern data for the fiber sensor.

    REGISTERING MEASURED OPTICAL FIBER INTERFEROMETRIC DATA WITH REFERENCE OPTICAL FIBER INTERFEROMETRIC DATA

    公开(公告)号:US20170322113A1

    公开(公告)日:2017-11-09

    申请号:US15528911

    申请日:2016-04-01

    Abstract: A system and method are used for an optical fiber having a core multiple, closely spaced optical gratings written along the core that create a repeated pattern in the core. A memory stores predetermined reference reflection data and measurement reflection data determined for a length of the core detected from interferometric patterns corresponding to scatter reflections received from the core. Data processing circuitry reduces or removes from the measurement reflection data information that corresponds to reflections due to the repeated pattern in the core to produce filtered measurement data. One or more portions of the filtered measurement data is/are correlated with one or more portions of the reference reflection data to produce multiple correlation values. The greatest of the multiple correlation values is determined, and a location along the fiber corresponding to the greatest correlation value is identified.

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