Brillouin distributed optical fiber strain sensors are often limited to static events because of the long acquisition time due to the classic frequency sweep technique. Recently, BOTDA sensor based on slope-assisted (SA) method has been proposed for fast strain measurement along the sensing fiber. In this paper, we present a novel dynamic SA-BOTDR for single-ended truly distributed strain measurement. Geometrical displacement and damping time of a 10.4 m instrumented pipe with a 3 glued fibers system. A 7.6 Hz acquisition rate was achieved with a strain error of 40 με and a 1m spatial resolution. From integration of longitudinal strains, local pipe displacement is calculated with a 12 mm precision.

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235Z (23 April 2017); doi: 10.1117/12.2263186

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)