High-sensitivity refractive index multimode fibre sensor based on a silica capillary

Ana I. Freitas; Jörg Bierlich; Marta S. Ferreira

doi:10.1117/12.3022546

20 June 2024 High-sensitivity refractive index multimode fibre sensor based on a silica capillary

Ana I. Freitas, Jörg Bierlich, Marta S. Ferreira

Proceedings Volume 12999, Optical Sensing and Detection VIII; 129992U (2024) https://doi.org/10.1117/12.3022546
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

A growing human population and changing climatic conditions have made food safety a pressing issue to our society. While conventional methods for their analysis are accurate, sensitive, and selective, they are costly, time-consuming and require skilled technicians. Optical fibre sensors have emerged as a versatile alternative for the detection of these compounds with advantages over traditional methods. In this work, we propose a high-sensitivity multimode fibre sensor for RI measurement. Our sensor consists of a section of capillary tube spliced between two sections of SMF and was characterised in regard to its response to variations in RI in a range between 1.3329 and 1.3459 RIU. The resulting spectrum presented several frequencies and the measurements performed at 1558 nm provided a sensitivity of 423.6 nm/RIU, with a resolution of 9.71 x 10^‑5 RIU. Further analysis of the spectrum using a low pass filter with a cutoff frequency of 0.06 nm^-1 provided a maximum sensitivity of 1459.4 nm/RIU, with a resolution of 3.33 x 10^-4 RIU.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ana I. Freitas, Jörg Bierlich, and Marta S. Ferreira "High-sensitivity refractive index multimode fibre sensor based on a silica capillary", Proc. SPIE 12999, Optical Sensing and Detection VIII, 129992U (20 June 2024); https://doi.org/10.1117/12.3022546

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