Patent ID: 11946824
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 0:
1. A method, comprising:
interrogating, using an input distributed fiber-optic sensing (DFOS) laser, three or more Fiber Bragg-Gratings (FBGs) connected in series by a standard fiber and placed along a fiber-optic cable, wherein each of the three or more FBGs has a respective wavelength, wherein the input DFOS laser has a first wavelength, wherein the standard fiber is inside the fiber-optic cable, wherein the three or more FBGs are placed at known locations along the fiber-optic cable, and wherein the first wavelength is different than the respective wavelength of each of the three or more FBGs;
interrogating, using an input Fiber Bragg-Grating (FBG) laser, the three or more FBGs;
receiving, at an FBG interrogator and as reflected laser, laser reflected from the three or more FBGs after the three or more FBGs are interrogated by the input DFOS laser and the input FBG laser;
determining locations of the three or more FBGs based on the reflected laser received at the FBG interrogator; and
filtering, based on (1) the known locations of the three or more FBGs and (2) the determined locations of the three or more FBGs, the reflected laser using a distributed sensing filter.