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 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.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Iacopo Toccafondo, Mohammad Taki, Alessandro Signorini, Farhan Zaidi, Tiziano Nannipieri, Stefano Faralli, and Fabrizio Di Pasquale
Opt. Lett. 37(21) 4434-4436 (2012)
Qiang Wu, Agus Muhammad Hatta, Yuliya Semenova, and Gerald Farrell
Appl. Opt. 48(29) 5451-5458 (2009)
Da-Peng Zhou, Li Wei, Wing-Ki Liu, Yu Liu, and John W. Y. Lit
Appl. Opt. 47(10) 1668-1672 (2008)