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    Broad bandwidth graded index multimode optical fiber for distributed temperature sensing in the 1550 NM region
    1.
    发明授权
    Broad bandwidth graded index multimode optical fiber for distributed temperature sensing in the 1550 NM region 有权

    公开(公告)号：US11473982B2

    公开(公告)日：2022-10-18

    申请号：US15909379

    申请日：2018-03-01

    申请人： OFS FITEL, LLC

    发明人： David D Braganza ,  Jie Li ,  Xiaoguang Sun

    IPC分类号： G01K11/32 ,  G02B6/028 ,  G02B6/42 ,  G01K11/324

    摘要： Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

    Temperature monitoring apparatus
    2.
    发明授权
    Temperature monitoring apparatus 有权

    公开(公告)号：US11467043B2

    公开(公告)日：2022-10-11

    申请号：US16273796

    申请日：2019-02-12

    申请人： AIRBUS OPERATIONS LIMITED

    发明人： Damien Valentin ,  Alessio Cipullo

    IPC分类号： G01K11/32 ,  B64D45/00 ,  G01K11/3206 ,  G02B6/02 ,  G01K11/322 ,  G01K11/324 ,  H02J4/00

    摘要： A temperature monitoring apparatus configured to monitor a temperature of a portion of a vehicle's electrical energy distribution network is disclosed. The apparatus includes a first optical fibre including one or more temperature sensing sections, each temperature sensing section being for thermal contact with a portion of a vehicle's electrical energy distribution network. Each temperature sensing section is arranged to produce, in response to an optical input signal, an optical output signal indicative of the temperature of the temperature sensing section. The apparatus is arranged to determine a temperature of the portion of the vehicle's electrical energy distribution network based on one or more of the output optical signals in use.

    Distributed temperature sensor with shortened sensing regions
    4.
    发明授权
    Distributed temperature sensor with shortened sensing regions 有权

    公开(公告)号：US11598678B1

    公开(公告)日：2023-03-07

    申请号：US16718113

    申请日：2019-12-17

    申请人： Intelligent Fiber Optic Systems, Inc.

    发明人： Behzad Moslehi ,  Mehrdad Moslehi

    IPC分类号： G01K11/32 ,  H01S3/30 ,  G01K11/324

    摘要： A distributed temperature sensor system has a pulsed laser coupled to a circulator, the circulator having a laser input and coupling energy to an optical reference coil in series with a measurement fiber having loops or helical turns, the circulator having a backscatter signal port coupling backscattered reflections from the measurement fiber. The backscatter signal port is coupled to a switch and mux, the switch and mux selecting either an anti-Stokes filter or a Stokes filter, the output of the mux coupled to a photodetector, the photodetector coupled to a histogram processor synchronized to the pulsed laser enable. The histogram processor uses the anti-Stokes and Stokes histogram counts associated with a sensor region to estimate a temperature of that sensor region.

    OPTICAL FIBER CABLE TEMPERATURE MEASUREMENT DEVICE
    7.
    发明申请
    OPTICAL FIBER CABLE TEMPERATURE MEASUREMENT DEVICE 有权

    公开(公告)号：US20220412810A1

    公开(公告)日：2022-12-29

    申请号：US17756886

    申请日：2020-11-11

    申请人： LS ELECTRIC CO., LTD.

    发明人： Hyungsuk CHOI

    IPC分类号： G01K1/143 ,  H01M10/48 ,  G01K11/324 ,  G01K11/3206

    摘要： The present invention relates to an optical fiber cable temperature measurement device, and more particularly, an optical fiber cable temperature measurement device that is applied to a multi-stage power device module such as a battery storage device. An optical fiber cable temperature measurement device according to an embodiment of the present invention is applied to a power device including a plurality of power device modules, and comprises: optical fiber cable measurement units that are provided in the respective power device modules; optical fiber cables inserted and installed in the respective optical fiber cable measurement units; and a control unit that is connected to one end of the optical fiber cables to measure the temperature.

    Dual wavelength distributed temperature sensing with built-in fiber integrity monitoring
    9.
    发明授权
    Dual wavelength distributed temperature sensing with built-in fiber integrity monitoring 有权

    公开(公告)号：US11280687B2

    公开(公告)日：2022-03-22

    申请号：US16119807

    申请日：2018-08-31

    申请人： VIAVI SOLUTIONS INC.

    发明人： Andre Champavere

    IPC分类号： G01K11/3206 ,  G01K1/00 ,  G01K3/14 ,  G01D5/353 ,  G01K11/324

    摘要： In some examples, a temperature distribution sensor may include a laser source to emit a laser beam that is tunable to a first wavelength and a second wavelength for injection into a device under test (DUT). A first wavelength optical receiver may convert a return signal corresponding to the first wavelength with respect to Rayleigh backscatter or Raman backscatter Anti-Stokes. A second wavelength optical receiver may convert the return signal corresponding to the second wavelength with respect to Rayleigh backscatter or Raman backscatter Stokes. Bending loss associated with the DUT may be determined by utilizing the Rayleigh backscatter signal corresponding to the first wavelength and the Rayleigh backscatter signal corresponding to the second wavelength. Further, temperature distribution associated with the DUT may be determined by utilizing the Raman backscatter Anti-Stokes signal corresponding to the first wavelength and the Raman backscatter Stokes signal corresponding to the second wavelength.

    Single-band distributed temperature sensing
    10.
    发明授权
    Single-band distributed temperature sensing 有权

    公开(公告)号：US11255734B2

    公开(公告)日：2022-02-22

    申请号：US16995498

    申请日：2020-08-17

    申请人： VIAVI SOLUTIONS INC.

    发明人： Vincent Lecoeuche

    IPC分类号： G01K3/00 ,  G01K11/00 ,  G01J5/00 ,  G01K11/32 ,  G01K3/06 ,  G01K11/324

    摘要： In some examples, a temperature distribution sensor may include a laser source to emit a laser beam that is tunable over a wavelength range. The wavelength range may be less than a Raman bandwidth in a device under test (DUT), or of-the-order-of the Raman bandwidth in the DUT. A pulsed source may apply a pulse drive signal to the laser beam or to a modulator to modulate the laser beam that is to be injected into the DUT. A bandpass filter may be operatively disposed between the laser source and the DUT, and may be configured to an anti-Stokes wavelength that is narrower than the Raman bandwidth. A photodiode may be operatively disposed between the bandpass filter and the DUT to acquire, from the DUT, anti-Stokes optical time-domain reflectometer traces for two preset wavelengths of the laser beam to determine a temperature distribution for the DUT.