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Rayleigh scatter based order of magnitude increase in distributed temperature and strain sensing by simple UV exposure of optical fibre

Sébastien Loranger, Mathieu Gagné, Victor Lambin-Iezzi and Raman Kashyap

Article (2015)

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Cite this document: Loranger, S., Gagné, M., Lambin-Iezzi, V. & Kashyap, R. (2015). Rayleigh scatter based order of magnitude increase in distributed temperature and strain sensing by simple UV exposure of optical fibre. Scientific Reports, 5. doi:10.1038/srep11177
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Abstract

We present a technique to improve signal strength, and therefore sensitivity in distributed temperature and strain sensing (DTSS) using Frequency domain Rayleigh scatter. A simple UV exposure of a hydrogen loaded standard SMF-28 fibre core is shown to enhance the Rayleigh back-scattered light dramatically by ten-fold, independent of the presence of a Bragg grating, and is therefore created by the UV exposure alone. This increase in Rayleigh back-scatter allows an order-of-magnitude increase in temperature and strain resolution for DTSS compared to un-exposed SMF-28 fibre used as a sensing element. This enhancement in sensitivity is effective for cm range or more sensor gauge length, below which is the theoretical cross-correlation limit. The detection of a 20 mK temperature rise with a spatial resolution of 2 cm is demonstrated. This gain in sensitivity for SMF-28 is compared with a high Ge doped photosensitive fibre with a characteristically high NA. For the latter, the UV enhancement is also present although of lower amplitude, and enables an even lower noise level for sensing, due to the fibre's intrinsically higher Rayleigh scatter signal.

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
Department: Département de génie électrique
Research Center: POLY-GRAMES - Centre de recherche avancée en micro-ondes et en électronique spatiale
Funders: Canada Research Chairs, Vanier scholarship program, National Science and Engineering Research Council scholarship
Date Deposited: 22 Nov 2018 15:55
Last Modified: 23 Nov 2018 01:20
PolyPublie URL: https://publications.polymtl.ca/3487/
Document issued by the official publisher
Journal Title: Scientific Reports (vol. 5)
Publisher: Nature Publishing Group
Official URL: https://doi.org/10.1038/srep11177

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