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Distributed Hydrogen Sensing With Brillouin Scattering in Optical Fibers

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4 Author(s)
Delepine-Lesoille, S. ; Chatenay-Malabry, Nat. Radioactive Waste Manage. Agency, Chatenay-Malabry, France ; Bertrand, J. ; Lablonde, L. ; Pheron, X.

We report on the design and test of a truly distributed hydrogen sensor based on Brillouin scattering into single-mode G652 optical fibers. The proposed system enables remote, robust, long-term, and truly distributed hydrogen sensing into long-range structures, such as radioactive waste repositories, with a spatial resolution in the order of 2 m over several hundred meters. For the first time, we demonstrate that Brillouin frequency shift depends on hydrogen concentration in the silica core with a rate of approximately 0.21 MHz/%H2 . Influence parameters are discussed. We showed that temperature influence may be corrected with a collocated carbon-coated fiber.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 17 )