In situ radiation influence on strain measurement performed by Brillouin sensors
Résumé
A new approach is proposed to monitor in situ gamma radiation influence on Brillouin optical fiber extensometers. Experimental results are illustrated with two fiber samples under gamma radiation up to total dose of about 600Gy. The Brillouin frequency shift has poor sensitivity at such radiations level, neither the spectral Brillouin signature nor its dependence with strain. Meanwhile, propagation losses increase under radiations, with an amplitude linked to fiber dopants. The target application is Nuclear Wastes Repository Monitoring where high doses are expected. UV radiation preliminary tests show that compaction phenomenon may occur at such high doses, inducing Brillouin frequency shift up to 20 MHz.
Domaines
Optique / photonique
Origine : Fichiers produits par l'(les) auteur(s)
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