Temperature-independent strain sensor based on a tapered Bragg fibre fabricated using a CO2 laser

T. J. M. Martins; M. B. Marques; P. Roy; R. Jamier; S. Février; O. Frazão

doi:10.1117/12.2235239

30 May 2016 Temperature-independent strain sensor based on a tapered Bragg fibre fabricated using a CO₂ laser

T. J. M. Martins, M. B. Marques, P. Roy, R. Jamier, S. Février, O. Frazão

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99161O (2016) https://doi.org/10.1117/12.2235239
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

Temperature-independent strain measurement is achieved resorting to a taper fabricated on a Bragg fibre using a CO₂ laser. The characteristic bimodal interference of an untapered Bragg fibre is rendered multimode after taper fabrication and the resulting transmission spectra are analysed as temperature and strain change. The intrinsic strain sensitivity exhibited by the Bragg fibre is increased 15 fold after tapering and reaches 22.68 pm/μepsilon. The difference in wavelength shift promoted by variations in temperature and strain for the two fringes studied is examined and strain sensing with little temperature sensitivity is achieved, presenting a sensitivity of 2.86 pm/μepsilon, for strain values up to 400 μepsilon.

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T. J. M. Martins, T. J. M. Martins, M. B. Marques, M. B. Marques, P. Roy, P. Roy, R. Jamier, R. Jamier, S. Février, S. Février, O. Frazão, O. Frazão, "Temperature-independent strain sensor based on a tapered Bragg fibre fabricated using a CO₂ laser", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161O (30 May 2016); doi: 10.1117/12.2235239; https://doi.org/10.1117/12.2235239

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