In situ radiation influence on strain measurement performed by Brillouin sensors

X Pheron (1) , Y Ouerdane (2) , Sébastien Girard (2) , C Marcandella (3) , S Delepine Lesoille (2) , J Bertrand (2) , Frédéric Taillade (4) , Erick Merliot (4) , Y Sikali Mamdem (5) , A Boukenter (2)

1 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs
2 LHC - Laboratoire Hubert Curien
3 DAM/DIF - DAM Île-de-France
4 IFSTTAR/MACS - Département Mesure, Auscultation et Calcul Scientifique
5 EDF R&D STEP - Simulation et Traitement de l'information pour l'Exploitation des systèmes de Production

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.

Mots clés: RADIATION; RAYON GAMMA; FREQUENCE; FIBRE OPTIQUE; SPECTRE

Domaines: Optique / photonique

X Pheron, Y Ouerdane, Sébastien Girard, C Marcandella, S Delepine Lesoille, et al.. In situ radiation influence on strain measurement performed by Brillouin sensors. 21st International Conference on Optical Fiber Sensors, May 2011, Canada. 4p. ⟨hal-00878048⟩