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    Parallel optics based optical time domain reflectometer acquisition
    11.
    发明授权
    Parallel optics based optical time domain reflectometer acquisition 有权

    公开(公告)号：US11808659B2

    公开(公告)日：2023-11-07

    申请号：US17233015

    申请日：2021-04-16

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00

    CPC classification number: G01M11/3136 ,  G01M11/3145

    Abstract: In some examples, parallel optics based optical time domain reflectometer acquisition may include a laser array operatively collimated to an optical fiber array to transmit, in parallel, a plurality of laser beams to optical fibers of the optical fiber array. A photodiode array may receive, in parallel, backscattered and reflected light from the optical fiber array. The photodiode array may determine, based on the backscattered and reflected light, properties of the optical fibers of the optical fiber array.

    Brillouin and rayleigh distributed sensor
    12.
    发明授权
    Brillouin and rayleigh distributed sensor 有权

    公开(公告)号：US11422060B2

    公开(公告)日：2022-08-23

    申请号：US17108680

    申请日：2020-12-01

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00 ,  G01D5/353 ,  G01K11/322

    Abstract: 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.

    Single-band distributed temperature sensing
    16.
    发明授权
    Single-band distributed temperature sensing 有权

    公开(公告)号：US11703398B2

    公开(公告)日：2023-07-18

    申请号：US17583000

    申请日：2022-01-24

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01K11/32 ,  G01K3/06 ,  G01K11/324

    CPC classification number: G01K11/32 ,  G01K3/06 ,  G01K11/324

    Abstract: 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.

    Temperature or strain distribution sensor comprising a coherent receiver to determine a temperature or a strain associated with a device under test
    17.
    发明授权
    Temperature or strain distribution sensor comprising a coherent receiver to determine a temperature or a strain associated with a device under test 有权

    公开(公告)号：US10539476B2

    公开(公告)日：2020-01-21

    申请号：US15968330

    申请日：2018-05-01

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01L1/24 ,  G01K11/32

    Abstract: According to examples, a temperature or strain distribution sensor may include a photodiode to acquire a beat frequency between a first laser beam and a second laser beam. A modulator may modulate the first laser beam that is to be injected into a device under test (DUT). A coherent receiver may acquire a backscattered signal from the DUT, and use the second laser beam as a local oscillator to determine a Brillouin trace with respect to the DUT. The Brillouin trace may be used to determine a Brillouin frequency shift and a Brillouin power for the DUT to implement an absolute referencing of a Rayleigh reference trace. The coherent receiver may determine, relative to the Rayleigh reference trace, a further Brillouin frequency shift and a Rayleigh frequency shift to determine a temperature or a strain associated with the DUT.

    TEMPERATURE OR STRAIN DISTRIBUTION SENSOR
    18.
    发明申请
    TEMPERATURE OR STRAIN DISTRIBUTION SENSOR 审中-公开

    公开(公告)号：US20180299346A1

    公开(公告)日：2018-10-18

    申请号：US15968330

    申请日：2018-05-01

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00 ,  G01L1/24 ,  G01K11/32

    Abstract: According to examples, a temperature or strain distribution sensor may include a photodiode to acquire a beat frequency between a first laser beam and a second laser beam. A modulator may modulate the first laser beam that is to be injected into a device under test (DUT). A coherent receiver may acquire a backscattered signal from the DUT, and use the second laser beam as a local oscillator to determine a Brillouin trace with respect to the DUT. The Brillouin trace may be used to determine a Brillouin frequency shift and a Brillouin power for the DUT to implement an absolute referencing of a Rayleigh reference trace. The coherent receiver may determine, relative to the Rayleigh reference trace, a further Brillouin frequency shift and a Rayleigh frequency shift to determine a temperature or a strain associated with the DUT.

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