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公开(公告)号：US12259296B2
公开(公告)日：2025-03-25
申请号：US17432709
申请日：2020-01-10
Applicant: NATIONAL RESEARCH COUNCIL OF CANADA
Inventor： Cyril Hnatovsky , Dan Grobnic , Stephen Mihailov , Ping Lu , Kasthuri De Silva , Huimin Ding , David Coulas , Robert Walker
IPC: G01M3/04
Abstract: An apparatus, method and system are set forth for detection of fluids using Bragg grating sensors, wherein the Bragg grating sensing element comprises an optical fiber having a Bragg grating inscribed therein characterized by optical properties that are dependent upon the periodicity and effective refractive index of the grating, and a package for subjecting the Bragg grating to a change in strain when contacted by a fluid such that periodicity and effective refractive index of the grating changes, whereby when interrogated with laser light any such change in periodicity and effective refractive index may be detected.
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公开(公告)号：US10520669B2
公开(公告)日：2019-12-31
申请号：US15693556
申请日：2017-09-01
Applicant: National Research Council of Canada
Inventor： Stephen Mihailov , Dan Grobnic , Rune Lausten , Robert Walker , Ping Lu , Huimin Ding , David Coulas , Cyril Hnatovsky
Abstract: There is provided an alignment system and method for use in an ultrashort pulse duration laser-based Fiber Bragg Grating (FBG) writing system, the alignment system comprising: clamps configured to hold a coated optical fiber in a position perpendicular to a beam path of an ultrashort pulse duration laser-based FBG writing station; an optical detector; and a control system with an input from the optical detector and an output to adjust parameters of an optical source and the FBG writing station adjust a distance between the optical fiber and an optical source of the writing station based on luminescence generated in a core of the optical fiber as indicated in a signal received at the input from the optical detector.
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3.发明申请公开(公告)号：US20190049272A1
公开(公告)日：2019-02-14
申请号：US16077781
申请日：2017-02-16
Applicant: National Research Council of Canada
Inventor： Dan Grobnic , Stephen Mihailov , Robert Walker , Ping Lu , Huimin Ding , David Coulas , Cyril Hnatovsky
Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
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4.发明授权公开(公告)号：US11359939B2
公开(公告)日：2022-06-14
申请号：US16952220
申请日：2020-11-19
Applicant: NATIONAL RESEARCH COUNCIL OF CANADA
Inventor： Dan Grobnic , Stephen Mihailov , Robert Walker , Ping Lu , Huimin Ding , David Coulas , Cyril Hnatovsky
Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
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