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20-km distributed temperature sensor based on spontaneous Brillouin scattering

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5 Author(s)
V. Lecoeuche ; Appl. Opt. Group, Kent Univ., Canterbury, UK ; M. W. Hathaway ; D. J. Webb ; C. N. Pannell
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We report on a novel experimental setup for distributed measurement of temperature, based on spontaneous Brillouin scattering in optical fiber. We have developed a mode-locked Brillouin fiber ring laser in order to generate the dual frequency source required for a heterodyne detection of the backscattered signal. This relatively simple system enables temperature measurements over 20 km with a spatial resolution of 7 m.

Published in:

IEEE Photonics Technology Letters  (Volume:12 ,  Issue: 10 )