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Proceedings Paper

High temperature measurements in irradiated environment using Raman fiber optics distributed temperature sensing
Author(s): Pierre Lecomte; Sylvain Blairon; Didier Boldo; Frédéric Taillade; Matthieu Caussanel; Gwendal Beauvois; Hervé Duval; Stéphane Grieu; Guillaume Laffont; Frédéric Lainé; Frédéric Carrel
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Paper Abstract

Optical fiber temperature sensors using Raman effect are a promising technology for temperature mapping of nuclear power plant pipes. These pipes are exposed to high temperature (350 °C) and gamma radiations, which is a harsh environment for standard telecom fibers. Therefore metal coated fibers are to be used to perform measurement over 300 °C. Temperature variations can affect the attenuation of the metallic coated fiber before irradiation. The latter induces an extra attenuation, due to light absorption along the fiber by radiation-induced defects. The recombination of these defects can be strongly accelerated by the high temperature value. As backscattered Raman signal is weak it is important to test optical fibers under irradiation to observe how it gets attenuated. Different experiments are described in this conference paper: two in situ irradiation campaigns with different dose rates at, both ambient and high temperature. We observe that the tested off-the-shelf metallic coated fibers have a high attenuation under irradiation. We also noticed the fact that thermal annealing plays a massive role in the +300 °C temperature range.

Paper Details

Date Published: 29 April 2016
PDF: 7 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 98991C (29 April 2016); doi: 10.1117/12.2219174
Show Author Affiliations
Pierre Lecomte, EDF Recherche & Développement (France)
Sylvain Blairon, EDF Recherche & Développement (France)
Didier Boldo, EDF Recherche & Développement (France)
Frédéric Taillade, EDF Recherche & Developpement (France)
Matthieu Caussanel, PROMES-CNRS (France)
Gwendal Beauvois, PROMES-CNRS (France)
Hervé Duval, PROMES-CNRS (France)
Stéphane Grieu, PROMES-CNRS (France)
Guillaume Laffont, CEA, LIST (France)
Frédéric Lainé, CEA, LIST (France)
Frédéric Carrel, CEA, LIST (France)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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