title: Integrated hybrid Raman/fiber Bragg grating interrogation scheme for distributed temperature and point dynamic strain measurements.
abstract: We propose and experimentally demonstrate the feasibility of an integrated hybrid optical fiber sensing interrogation technique that efficiently combines distributed Raman-based temperature sensing with fiber Bragg grating (FBG)-based dynamic strain measurements. The proposed sensing system is highly integrated, making use of a common optical source/receiver block and exploiting the advantages of both (distributed and point) sensing technologies simultaneously. A multimode fiber is used for distributed temperature sensing, and a pair of FBGs in each discrete sensing point, partially overlapped in the spectral domain, allows for temperature-independent discrete strain measurements. Experimental results report a dynamic strain resolution of 7.8 nε/√Hz within a full range of 1700 με and a distributed temperature resolution of 1°C at 20 km distance with 2.7 m spatial resolution.
authors.affiliation: Scuola Superiore Sant'Anna, Institute of Communication, Information and Perception Technologies, Pisa, Italy.
authors.forename: Farhan
authors.initials: F
authors.lastname: Zaidi
authors.forename: Tiziano
authors.initials: T
authors.lastname: Nannipieri
authors.forename: Marcelo A
authors.initials: MA
authors.lastname: Soto
authors.forename: Alessandro
authors.initials: A
authors.lastname: Signorini
authors.forename: Gabriele
authors.initials: G
authors.lastname: Bolognini
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Di Pasquale