The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2025
Filed:
Mar. 03, 2023
Nanjing University, Nanjing, CN;
NANJING UNIVERSITY, Nanjing, CN;
Abstract
A distributed weak grating array sensing system and method with multiple demodulation modes are provided for optical fiber sensing. The distributed weak grating array sensing method includes: amplitude modulating, by an acousto-optic modulator, a laser light to form a double-pulse light satisfying a preset requirement; linearly phase modulating, by a phase modulator, a phase of front pulse light or rear pulse light of the double-pulse light; amplifying double-pulse light after amplitude modulation and phase modulation, and introducing the double-pulse light into a grating array; allowing reflected light of the double-pulse light on adjacent gratings to superimpose and form interference light; introducing the interference light into a photoelectric detector; acquiring, by an acquisition card, data; locating a disturbance through the amplitude fluctuation; accurately acquiring a sampling number corresponding to 2π; and selecting π/2 phase difference demodulation, 2π/3 phase difference demodulation, π/4 phase difference demodulation, proposed N-step phase difference demodulation as required.