Distributed Optical Fiber Sensor Allowing Temperature and Strain Discrimination in Radiation Environments

C. Sabatier (1, 2, 3) , V. Lecoeuche (4) , S. Girard (1) , G. Melin (2) , T. Robin (2) , B. Cadier (2) , L. Mescia (3) , A. Morana (1) , Y. Ouerdane (1) , A. Boukenter (1) , A. Champavère (4) , E. Marin (1)

1 LHC - Laboratoire Hubert Curien
2 iXBlue Photonics
3 Polytechnic University of Bari / Politecnico di Bari
4 Viavi Solutions

We evaluate the potential of a new architecture of distributed optical fiber sensor (DOFS) to discriminate between the temperature and strain changes along a single optical fiber exposed to radiation. This DOFS exploits the measurements of both the Landau-Placzek ratio (LPR) and the Brillouin Frequency Shift (BFS) to achieve the discrimination between the two parameters on up to ten kilometers of fiber with a spatial resolution of 1 m. We demonstrate that the LPR remains unaffected up to MGy(SiO2) dose levels whereas the BFS is only slightly shifted by the radiation. The measured radiation-induced BFS is strongly reduced in radiation hardened fluorine-doped single-mode optical fibers. Combining the DOFS architecture and this fiber allows discriminating temperature and strain using a single optical fiber up to MGy dose levels.

Domaines: Optique / photonique

C. Sabatier, V. Lecoeuche, S. Girard, G. Melin, T. Robin, et al.. Distributed Optical Fiber Sensor Allowing Temperature and Strain Discrimination in Radiation Environments. IEEE Transactions on Nuclear Science, In press, pp.1-1. ⟨10.1109/TNS.2019.2903922⟩. ⟨hal-02122063⟩