US 12,031,871 B2Granted

System and method for determining changes of an optical fibre

AssigneeSaab AB

InventorsRoy Josefsson, Daniel Eckerstroem

Life of this patent

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Abstract

A method is provided for determining temperature changes of an optical fibre having Fiber Bragg Grating patterns provided in at least one portion of the optical fibre. The method involves: emitting light into the optical fibre in a first direction from a first detector arrangement, receiving reflections from the patterns of such emitted light by the first detector arrangement, and processing the reflections for determining a current temperature change related to the optical fibre; and on the basis of predetermined criteria, emitting light into the optical fibre in an opposite, second, direction from a second detector arrangement, receiving reflections from the patterns of such emitted light by the second detector arrangement, and processing the reflections for determining a current temperature change related to the optical fibre. A computer program product comprising program code for implementing the above-described method is also provided, along with an associated system and platform.

Claims17

Dependent claims

A method for determining pressure changes of an optical fibre (250) having Fiber Bragg Grating (FBG) patterns provided in at least one portion (Portion 1) of said optical fibre (250), said optical fibre (250) being connected between a first detector arrangement (210) and a second detector arrangement (220), wherein said first detector arrangement (210) comprises a first light emitting device (231), a first light detecting device (232) and a first control arrangement (233;

500), wherein said second detector arrangement (220) comprises a second light emitting device (241), a second light detecting device (242) and a second control arrangement (243;
500), the optical fibre (250) comprises a core and a casing, wherein the length of the core of the optical fibre (250) is longer than the casing of the optical fibre (250);
the method comprising the steps of:
emitting (s410) light into said optical fibre (250) in a first direction (D1) from said first detector arrangement (210), receiving reflections from said FBG patterns of such emitted light by said first detector arrangement (210), and processing said reflections for determining a current pressure change related to said optical fibre (250);
and
on the basis of predetermined criteria, emitting (s440) light into said optical fibre (250) in an opposite, second, direction (D2) from said second detector arrangement (220), receiving reflections from said FBG patterns of such emitted light by said second detector arrangement (220), and processing said reflections for determining a current pressure change related to said optical fibre (250).

3 more elements

A system (289) for determining pressure changes of an optical fibre (250) having Fiber Bragg Grating (FBG) patterns provided in at least one portion (Portion 1) of said optical fibre (250), the system comprising:

a first detector arrangement (210) and a second detector arrangement (220) wherein said first detector arrangement (210) and second detector arrangement (220) being connected by said optical fibre (250);
said first detector arrangement (210) comprises a first light emitting device (231), a first light detecting device (232) and a first control arrangement (233;
500);
said first light emitting device (231) being arranged for emitting light into said optical fibre (250) in a first direction (D1) from said first detector arrangement (210), said first light detecting device (232) being arranged for receiving reflections from said FBG patterns of such emitted light by said first detector arrangement (210), and said first control arrangement (233;
500) being arranged for processing said reflections for determining a current pressure change related to said optical fibre (250);
said second detector arrangement (220) comprises a second light emitting device (241), a second light detecting device (242) and a second control arrangement (243;
500);
said second light emitting device (241) being arranged for, on the basis of predetermined criteria, emitting light into said optical fibre (250) in an opposite, second, direction (D2) from said second detector arrangement (220), said second light detecting device (242) being arranged for receiving reflections from said FBG patterns of such emitted light by said second detector arrangement (220), and said second control arrangement (243;
500) being arranged for processing said reflections for determining a current pressure change related to said optical fibre (250);
the optical fibre (250) comprises a core and a casing, wherein the length of the core of the optical fibre (250) is longer than the casing of the optical fibre (250).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/647,190Filed 6 Jan 2022 · continuation
Priority: SE 1850330-023 Mar 2018
Published: US 2022/0128416 A128 Apr 2022
Granted: 9 Jul 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01K 11/3206
Using changes in transmittance, scattering or luminescence in optical fibres: at discrete locations in the fibre, e.g. using Bragg scattering
G01D 3/10
Indicating or recording apparatus with provision for the special purposes referred to in the subgroups: with provision for switching-in of…
G01D 5/35316
Using multiple waves interferometer: using a Bragg gratings
G01D 5/35387
Using multiple sensor devices using multiplexing techniques: using wavelength division multiplexing

Family

Application16/269,776Parent of this continuation · filed 7 Feb 2019
US 2022/0128416 A1Pre-grant publication · published 28 Apr 2022
US 11,248,969 B2Parent of this continuation
US 2019/0293500 A1Published application
US 12,031,871 B2This patent

From the US filing history. Foreign family members aren’t listed.