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    Single-band distributed temperature sensing
    3.
    发明授权
    Single-band distributed temperature sensing 有权

    公开(公告)号：US10775246B2

    公开(公告)日：2020-09-15

    申请号：US15945501

    申请日：2018-04-04

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01K3/00 ,  G01K11/00 ,  G01J5/00 ,  G01K11/32 ,  G01K3/06

    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.

    OPTICAL FIBER-BASED SENSING MEMBRANE
    4.
    发明申请
    OPTICAL FIBER-BASED SENSING MEMBRANE 有权

    公开(公告)号：US20220333962A1

    公开(公告)日：2022-10-20

    申请号：US17718416

    申请日：2022-04-12

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Jeffery Stephen GRAVES ,  Vincent Lecoeuche ,  Andre Champavere

    IPC: G01D21/02 ,  G01K11/324 ,  G01K11/322 ,  G01K11/3206 ,  G01H9/00

    Abstract: According to examples, an optical fiber-based sensing membrane may include at least one optical fiber, and a substrate. The at least one optical fiber may be integrated in the substrate. The substrate may include a thickness and a material property that are specified to ascertain, via the at least one optical fiber and for a device that is contiguously engaged with a surface of the substrate, includes the substrate embedded in the device, or includes the surface of the substrate at a predetermined distance from the device, a thermal and/or a mechanical property associated with the device, or a radiation level associated with a device environment.

    PARALLEL OPTICS BASED OPTICAL TIME DOMAIN REFLECTOMETER ACQUISITION
    5.
    发明申请
    PARALLEL OPTICS BASED OPTICAL TIME DOMAIN REFLECTOMETER ACQUISITION 有权

    公开(公告)号：US20210231524A1

    公开(公告)日：2021-07-29

    申请号：US17233015

    申请日：2021-04-16

    Applicant: Viavi Solutions Inc.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00

    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
    6.
    发明授权
    Brillouin and rayleigh distributed sensor 有权

    公开(公告)号：US10073006B2

    公开(公告)日：2018-09-11

    申请号：US15130287

    申请日：2016-04-15

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00 ,  G01D5/353

    CPC classification number: G01M11/3181 ,  G01D5/35358 ,  G01D5/35361 ,  G01D5/35364 ,  G01K2011/322 ,  G01M11/3127 ,  G01M11/3172

    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
    7.
    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

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01K3/00 ,  G01K11/00 ,  G01J5/00 ,  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.

    Parallel optics based optical time domain reflectometer acquisition
    8.
    发明授权
    Parallel optics based optical time domain reflectometer acquisition 有权

    公开(公告)号：US10996138B2

    公开(公告)日：2021-05-04

    申请号：US16682863

    申请日：2019-11-13

    Applicant: VIAVI SOLUTIONS INC.

    Inventor： Vincent Lecoeuche

    IPC: G01M11/00

    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.

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