We report the study of a radiation resistant single mode optical fiber doped with fluorine exposed to mixed neutron and gamma-radiation up to 10(17) n/cm(2) fluence and >2 MGy dose to evaluate its performances when used as the sensing element of a distributed Optical Frequency Domain Reflectometry (OFDR). The use of complementary spectroscopic techniques highlights some differences between the responses of solely gamma-radiation (10 MGy) or mixed neutron and. (10(17) n/cm2 + >2 MGy) irradiated samples. Those differences are linked to the defect generation rather than to structural changes of the a-SiO2 host matrix. We show that a modification of the refractive index of similar to 10(-5) is induced at the highest investigated neutron fluence. However, the feasibility of distributed temperature measurements along the irradiated fiber is demonstrated with an accuracy of 0.1 degrees C over a sensing length up to similar to 130 m with the tested OBR4600 interrogator. These results are very promising for the integration of OFDR sensors in mixed neutron and gamma radiation environments.

Rizzolo, S., Boukenter, A., Marin, E., Robin, T., Cannas, M., Morana, A., et al. (2017). Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments. IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 64(1), 61-67 [10.1109/TNS.2016.2606566].

Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments

RIZZOLO, Serena;CANNAS, Marco;
2017

Abstract

We report the study of a radiation resistant single mode optical fiber doped with fluorine exposed to mixed neutron and gamma-radiation up to 10(17) n/cm(2) fluence and >2 MGy dose to evaluate its performances when used as the sensing element of a distributed Optical Frequency Domain Reflectometry (OFDR). The use of complementary spectroscopic techniques highlights some differences between the responses of solely gamma-radiation (10 MGy) or mixed neutron and. (10(17) n/cm2 + >2 MGy) irradiated samples. Those differences are linked to the defect generation rather than to structural changes of the a-SiO2 host matrix. We show that a modification of the refractive index of similar to 10(-5) is induced at the highest investigated neutron fluence. However, the feasibility of distributed temperature measurements along the irradiated fiber is demonstrated with an accuracy of 0.1 degrees C over a sensing length up to similar to 130 m with the tested OBR4600 interrogator. These results are very promising for the integration of OFDR sensors in mixed neutron and gamma radiation environments.
http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=23
Rizzolo, S., Boukenter, A., Marin, E., Robin, T., Cannas, M., Morana, A., et al. (2017). Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments. IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 64(1), 61-67 [10.1109/TNS.2016.2606566].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/240708
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