Hybrid Raman/fiber Bragg grating sensor for distributed temperature and discrete dynamic strain measurements

Opt Lett. 2012 Nov 1;37(21):4434-6. doi: 10.1364/OL.37.004434.

Abstract

We propose and experimentally demonstrate a hybrid fiber optic sensing technique that effectively combines Raman optical time domain reflectometry and in-line time-division-multiplexing for fiber Bragg grating (FBG) dynamic interrogation. The highly integrated proposed scheme employs broadband apodized low reflectivity FBGs with a single narrowband optical source and a shared receiver block, allowing for simultaneous measurements of distributed static temperature and discrete dynamic strain, over the same sensing fiber.