We introduce a new technique to extend the dynamic range of coherent BOTDA sensors in dynamic measurements. It is based on launching pump pulses containing multiple frequencies so that the Brillouin spectra that they generate overlap, allowing to measure larger Brillouin frequency shift variations. Furthermore, this technique is compared to the procedure of shortening the length of the pulses, which also leads to a broadening of the spectra. We analyze both techniques, obtaining a threefold increase in range up to 400 MHz (±4000 με).

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103237Y (23 April 2017); doi: 10.1117/12.2265423

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)