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20 June 2024 Measurements of the chromatic refractive index signature of wine models using a fibre long period gratings
T. Allsop, A. Ioannou, K. Kalli, R. S. Bhamber, E. Aguera, A. Samson, P. Rigou, C. Saucier, B. Dussardier
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Proceedings Volume 12999, Optical Sensing and Detection VIII; 1299902 (2024) https://doi.org/10.1117/12.3022049
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
A novel optical fibre device is proposed for real-time measurements of near infrared chromatic refractive index signature of a liquid medium in the 1100-1700 nm range. This inline optical fibre chromatic refractive index analyser is based upon collocated fibre long period gratings written adjacently in the core by femtosecond laser inscription yielding 8 attenuation bands associated with different cladding modes, yielding 8 independent measurements across the entire wavelength range. This fibre device is tested on a series of chemical compounds associated with wines. The results for each compound yielded distinctive chromatic responses. The limits of detection for this fibre devices ranged from 1×10-3 to 6×10-5 mol/L for the compounds associated with wines. This demonstrates a potential usefulness of such an optical fibre sensor capable of monitoring in real-time effective chromatic refractive index signatures that is not offered by any current technology.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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T. Allsop, A. Ioannou, K. Kalli, R. S. Bhamber, E. Aguera, A. Samson, P. Rigou, C. Saucier, and B. Dussardier "Measurements of the chromatic refractive index signature of wine models using a fibre long period gratings", Proc. SPIE 12999, Optical Sensing and Detection VIII, 1299902 (20 June 2024); https://doi.org/10.1117/12.3022049
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KEYWORDS
Signal attenuation
Cladding
Refractive index
Optical fibers
Sensors
Liquids
Femtosecond phenomena
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