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Proceedings Paper

Radiation hardness of fiber optic sensors for monitoring and remote handling applications in nuclear environments
Author(s): Francis Berghmans; Alberto Fernandez Fernandez; Benoit Brichard; Frans Vos; Marc C. Decreton; Andrei I. Gusarov; Olivier Deparis; Patrice Megret; Michel Blondel; Serge Caron; Andre Morin
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Paper Abstract

We report on our irradiation experiments on different types of fiber-optic sensors, including three types of commercially available temperature sensors, a multimode extrinsic Fabry-Perot cavity strain sensor and fiber Bragg- gratings. For the temperature sensors, results show that gamma radiation does not interfere with the basic sensing mechanism and that the most critical component turns out to be the optical fiber itself. Semiconductor absorption temperature sensor showed no degradation up to total doses of 250 kGy, whereas the specifications of Fabry-Perot type sensor and fluorescence temperature sensors were already dramatically influenced below the kGy-level. Replacing the optical fiber by a more radiation resistant version allowed to increase the radiation hardness of the fluorescence sensors system by orders of magnitude. The use of fiber- optic sensors in the presence of neutron radiation remains compromised. Similar conclusions are valid for the Fabry- Perot type fiber-optic strain sensors. We finally show that the Bragg-grating resonance wavelength can shift with radiation dose, but that the temperature sensitivity remains unaltered.

Paper Details

Date Published: 11 January 1999
PDF: 12 pages
Proc. SPIE 3538, Process Monitoring with Optical Fibers and Harsh Environment Sensors, (11 January 1999); doi: 10.1117/12.335757
Show Author Affiliations
Francis Berghmans, SCK*CEN-Belgian Nuclear Research Ctr. (Belgium)
Alberto Fernandez Fernandez, SCK*CEN-Belgian Nuclear Research Ctr. (Belgium)
Benoit Brichard, SCK*CEN-Belgian Nuclear Research Ctr. (Belgium)
Frans Vos, SCK*CEN-Belgian Nuclear Research Ctr. (Belgium)
Marc C. Decreton, SCK*CEN-Belgian Nuclear Research Ctr. (Belgium)
Andrei I. Gusarov, SCK*CEN-Belgian Nuclear Research Ctr. and Faculte Polytechnique de Mons (Belgium)
Olivier Deparis, Faculte Polytechnique de Mons (United Kingdom)
Patrice Megret, Faculte Polytechnique de Mons (Belgium)
Michel Blondel, Faculte Polytechnique de Mons (Belgium)
Serge Caron, National Optics Institute (Canada)
Andre Morin, National Optics Institute (Canada)

Published in SPIE Proceedings Vol. 3538:
Process Monitoring with Optical Fibers and Harsh Environment Sensors
Michael A. Marcus; Michael A. Marcus; Anbo Wang, Editor(s)

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