US 12,516,976 B2Granted

Outdoor application of distributed fiber optic sensing / acoustic sensing

AssigneeNEC Corportation

InventorsSarper Ozharar, Ting Wang, Yue Tian, Yangmin Ding, Philip Ji, Shaobo Han, Ming-Fang Huang, Tingfeng Li

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Abstract

Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously sense/monitor outdoor facilities and structures including outdoor cabinets containing fiber optic facilities in which the cabinet/fiber optic cable contained therein are configured to provide superior acoustic sensing. Further outdoor facilities and structures that are monitored include manhole structures. Superior DFOS/DAS monitoring results are obtained by employing a machine learning-based analysis method that employs a temporal relation network (TRN).

Claims11

Dependent claims

A distributed fiber optic sensing (DFOS) system comprising:

a length of optical fiber sensor cable;
a DFOS interrogator system in optical communication with the length of optical fiber sensor cable;
an intelligent analyzer configured to analyze DFOS sensing data received by the DFOS interrogator system;
the distributed fiber optic sensing (DFOS) system CHARACTERIZED BY
an outdoor fiber cabinet in positioned in an optical path of the length of optical fiber sensor cable, the outdoor fiber cabinet configured to amplify acoustic vibration waves and mechanically convey the acoustic vibration waves to the optical fiber sensor cable such that acoustic vibration signals are detected by the intelligent analyzer;
wherein at least a portion of the outdoor fiber cabinet is configured as a fiber microphone/amplifier and includes a fiber coil formed from the optical fiber sensor cable;
wherein the fiber coil formed from the optical fiber sensor cable is mechanically mounted to the portion of the outdoor fiber cabinet configured as a fiber microphone/amplifier;
wherein the portion of the outdoor fiber cabinet configured as a fiber microphone/amplifier includes an interaction area that interacts with acoustic vibration waves;
and
wherein the outdoor fiber cabinet configured as a fiber microphone/amplifier is a door.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/958,415Filed 2 Oct 2022 · us provisional application
Priority: 22 Oct 2021
Published: US 2023/0130788 A127 Apr 2023
Granted: 6 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01H 9/004
Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means: using fibre optic…
G01H 9/006
Using fibre optic sensors: the vibrations causing a variation in the relative position of the end of a fibre and another element
G01D 5/35361
Using backscattering to detect the measured quantity: using elastic backscattering to detect the measured quantity, e.g. using Rayleigh backscattering
G01D 5/35364
Using backscattering to detect the measured quantity: using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or…

Family

Application63/270,651Us provisional application · filed 22 Oct 2021
Application63/311,523Us provisional application · filed 18 Feb 2022
Application63/313,028Us provisional application · filed 23 Feb 2022
US 2023/0130788 A1Pre-grant publication · published 27 Apr 2023
US 12,516,976 B2This patent

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