title: Distributed dynamic large strain optical fiber sensor based on the detection of spontaneous Brillouin scattering.
abstract: A Brillouin-based distributed optical fiber dynamic strain sensor is described which converts strain-induced Brillouin frequency shift into optical intensity variations by using an imbalanced Mach-Zhender interferometer. A 3×3 coupler is used at the output of this interferometer to permit differentiate and cross multiply demodulation. The demonstrated sensor is capable of probing dynamic strain disturbances over 2 km of sensing length every 0.5 s up to a strain of 10 mε with an accuracy of ±50 με and spatial resolution of 1.3 m.
authors.affiliation: Optoelectronics Research Centre (ORC), University of Southampton, Southampton, UK. am10g09@orc.soton.ac.uk
authors.forename: Ali
authors.initials: A
authors.lastname: Masoudi
authors.forename: Mohammad
authors.initials: M
authors.lastname: Belal
authors.forename: Trevor P
authors.initials: TP
authors.lastname: Newson