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1. (WO2016060746) DISTRIBUTED BRILLOUIN SENSING USING CORRELATION

Pub. No.:    WO/2016/060746    International Application No.:    PCT/US2015/048147
Publication Date: Fri Apr 22 01:59:59 CEST 2016 International Filing Date: Thu Sep 03 01:59:59 CEST 2015
IPC: G01D 5/26
G01M 11/00
G01K 11/32
G01B 11/16
Applicants: NEC LABORATORIES AMERICA, INC.
Inventors: WANG, Ting
WENG, Yi
Title: DISTRIBUTED BRILLOUIN SENSING USING CORRELATION
Abstract:
Methods and systems for sensing conditions of a fiber include splitting a light signal into two branches (108). A first branch is converted (116) to have a mode different from that of the second branch. Both branches are mode multiplexed (118) into a single fiber (122). An output of the fiber is mode demultiplexed into the two branches (120). The first branch is mode converted (116) to its original mode. Brillouin scattering patterns of the two branches are compared (400) to determine a temperature and strain profile of the fiber.