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    OPTICAL FIBER STATE MEASURING DEVICE AND OPTICAL FIBER STATE MEASURING METHOD
    1.
    发明公开
    OPTICAL FIBER STATE MEASURING DEVICE AND OPTICAL FIBER STATE MEASURING METHOD 审中-公开

    公开(公告)号：US20240310192A1

    公开(公告)日：2024-09-19

    申请号：US18576031

    申请日：2021-07-15

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Chihiro KITO

    IPC分类号： G01D5/353

    CPC分类号： G01D5/35364

    摘要： In the present disclosure, a direction of a change ΔBFS in a Brillouin frequency shift amount of an optical fiber to be measured M from a steady state or a non-application state to the non-steady state or the application state is detected as is determined as one of a positive direction and a negative direction based on first beat frequencies ΔR1 and ΔR1′ and second beat frequencies ΔR2 and ΔR2′ between Brillouin frequency shift amounts BFSM and BFSM′ of the optical fiber to be measured M and constant Brillouin frequency shift amounts BFSR1 and BFSR2 of a first reference optical fiber 7 and a second reference optical fiber 9 in the steady state of temperature or the non-application state of strain or vibration and in the non-steady state of temperature or the application state of strain or vibration.

    SIGNAL DETECTING DEVICE AND OPTICAL FIBER CHARACTERISTICS MEASURING DEVICE
    3.
    发明公开
    SIGNAL DETECTING DEVICE AND OPTICAL FIBER CHARACTERISTICS MEASURING DEVICE 审中-公开

    公开(公告)号：US20240003716A1

    公开(公告)日：2024-01-04

    申请号：US18212439

    申请日：2023-06-21

    申请人： Yokogawa Electric Corporation

    发明人： Masayoshi Honma ,  Shin-ichirou Tezuka

    IPC分类号： G01D5/353

    CPC分类号： G01D5/35345 ,  G01D5/35364

    摘要： A signal detecting device includes a multiplier that multiplies a measurement signal by a reference signal, a filter that filters a multiplication result from the multiplier, a first storage that stores an internal state of the filter; and a second storage that stores a filtering result from the filter. The filter filters the multiplication result using the internal state stored in the first storage. The first storage switches an area in or from which the filter writes or reads the internal state in accordance with an index signal representing a type of amplitude of a time-divisional signal in the measurement signal. The second storage switches an area in which the filtering result is stored in accordance with the index signal.

    Brillouin Sensing Using Polarization Pulling
    4.
    发明公开
    Brillouin Sensing Using Polarization Pulling 审中-公开

    公开(公告)号：US20230332932A1

    公开(公告)日：2023-10-19

    申请号：US18136256

    申请日：2023-04-18

    申请人： The Government of the United States of America, as represented by the Secretary of the Navy

    发明人： Joseph B. Murray ,  Brandon Redding

    IPC分类号： G01D5/353 ,  G01K11/322

    CPC分类号： G01D5/35364 ,  G01K11/322

    摘要： Systems and methods are provided for enabling improved sensitivity in low-gain regimes. Embodiments of the present disclosure use polarization pulling to separate a signal of interest (e.g., amplified probe light) from the background probe light. This enables a dramatic increase in probe power and thereby increases the signal-to-noise ratio of the measurement. Embodiments of the present disclosure provide a vector subtraction technique to compensate for undesirable interference effects resulting from the finite extinction of standard polarization components (i.e. polarizing beam splitters) and polarization fluctuations. Embodiments of the present disclosure enable Brillouin sensing with improved accuracy in low-gain regimes and is particularly relevant for high-spatial resolution sensing applications.

    Temperature and strain measurement using a shared fiber-optic cable within a wellbore
    5.
    发明授权
    Temperature and strain measurement using a shared fiber-optic cable within a wellbore 有权

    公开(公告)号：US11761328B2

    公开(公告)日：2023-09-19

    申请号：US17391385

    申请日：2021-08-02

    申请人： Halliburton Energy Services, Inc.

    发明人： Michel LeBlanc

    IPC分类号： E21B47/07 ,  E21B47/007 ,  G01D5/353 ,  G01K11/322 ,  G01L1/24

    CPC分类号： E21B47/07 ,  E21B47/007 ,  G01D5/35361 ,  G01D5/35364 ,  G01K11/322 ,  G01L1/242

    摘要： A well system includes a fiber-optic cable that can be positioned downhole along a wellbore. The well system further includes a plurality of opto-electrical interfaces to communicatively couple to the fiber-optic cable to monitor temperature and strain along the fiber-optic cable. Additionally, the well system includes a processing device and a memory device that includes instructions executable by the processing device to cause the processing device to perform operations. The operations include receiving data representing frequency or phase shift measurements from the opto-electrical interfaces using at least two frequency or phase shift measurement techniques. Further, the operations include generating a temperature shift output and a strain change output using an inversion comprising sensitivity ratios and the data representing the frequency or phase shift measurements from the plurality of opto-electrical interfaces.

    BRILLOUIN AND RAYLEIGH DISTRIBUTED SENSOR
    6.
    发明申请
    BRILLOUIN AND RAYLEIGH DISTRIBUTED SENSOR 审中-公开

    公开(公告)号：US20180348086A1

    公开(公告)日：2018-12-06

    申请号：US16059837

    申请日：2018-08-09

    申请人： VIAVI SOLUTIONS INC.

    发明人： Vincent LECOEUCHE

    IPC分类号： G01M11/00 ,  G01D5/353 ,  G01K11/32

    CPC分类号： G01M11/3181 ,  G01D5/35358 ,  G01D5/35361 ,  G01D5/35364 ,  G01K2011/322 ,  G01M11/3127 ,  G01M11/3172

    摘要： According to examples, a Brillouin and Rayleigh distributed sensor may include a first laser source to emit a first laser beam, and a second laser source to emit a second laser beam. A photodiode may acquire a beat frequency between the two laser beams. The beat frequency may be used to maintain a predetermined offset frequency shift between the two laser beams. A modulator may modulate the first laser beam. The modulated first laser beam is to be injected into a device under test (DUT), A coherent receiver may acquire a backscattered signal from the DUT. The backscattered signal results from the modulated first laser beam injected into the DUT. The coherent receiver may use the second laser beam as a local oscillator to determine Brillouin and Rayleigh traces with respect to the DUT based on the predetermined offset frequency shift.