论文信息 - In situ radiation influence on strain measurement performance of Brillouin sensors

In situ radiation influence on strain measurement performance of Brillouin sensors

A new approach is proposed to monitor in situ the influence of gamma radiations on Brillouin properties of optical fiber extensometers. Experimental results are illustrated with the characterization of two fibers samples up to total dose of about 600Gy. The Brillouin frequency shift remains unaffected at such radiations level, as well as the spectral Brillouin signature or its dependence with strain. Meanwhile, propagation losses increase under radiations with an amplitude related to fiber dopants. The target application is nuclear wastes repository monitoring where higher 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.

[1] Vincent Lanticq. Mesure répartie de température et de déformations par diffusion Brillouin : de la fibre optique au capteur pour le génie civil , 2009 .

[2] Youcef Ouerdane,et al. UV irradiation influence on stimulated Brillouin scattering in photosensitive optical fibres , 2011 .

[3] Youcef Ouerdane,et al. Gamma-rays and pulsed X-ray radiation responses of nitrogen-, germanium-doped and pure silica core optical fibers , 2004 .

[4] S. Girard,et al. Gamma and UV Radiation-Induced Color Centers in Optical Fibers , 2005 .

[5] L. Thévenaz,et al. Simple distributed fiber sensor based on Brillouin gain spectrum analysis. , 1996, Optics letters.

[6] Luc Thévenaz,et al. The effects of gamma-radiation on the properties of Brillouin scattering in standard Ge-doped optical fibres , 2006 .

[7] B. Brichard,et al. Gamma radiation-induced refractive index change in Ge- and N-doped silica , 2008 .

[8] Kazuo Hotate,et al. Stimulated Brillouin scattering and its dependences on strain and temperature in a high-delta optical fiber with F-doped depressed inner cladding. , 2007, Optics letters.