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Simultaneous measurement of refractive index and temperature using a double antiresonant hollow core fiber
Author(s): Marta S. Ferreira; Jörg Bierlich; Jens Kobelke; João L. Pinto; Katrin Wondraczek
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Paper Abstract

In this work, an inline sensor based on a double antiresonant hollow core fiber is proposed for the simultaneous measurement of refractive index and temperature. The fiber, consisting of four silica capillaries with wall thickness of ~1.5 μm and a cladding with a thickness of ~36.5 μm, is spliced between two sections of single mode fiber. The spectral behavior, measured in transmission, results from the combination of different frequencies which enable the discrimination between the two parameters. The sensing head is subjected to refractive index measurements using aqueous solutions with different concentrations of ethanol. For a sensor with a length of ~10 mm, and considering the lower frequency signal, the sensitivity to refractive index is 389.6 nm/RIU, whereas for the higher frequency, the sensitivity attained is 2.8 nm/RIU. On the other hand, the sensing head presented a sensitivity to temperature of 25.5 pm/K and -27.6 pm/K for the higher and lower frequencies, respectively.

Paper Details

Date Published: 3 October 2019
PDF: 4 pages
Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071W (3 October 2019); doi: 10.1117/12.2527473
Show Author Affiliations
Marta S. Ferreira, Univ. of Aveiro (Portugal)
Leibniz Institute of Photonic Techonology (Germany)
Jörg Bierlich, Leibniz Institute of Photonic Technology (Germany)
Jens Kobelke, Leibniz Institute of Photonic Technology (Germany)
João L. Pinto, Univ. of Aveiro (Portugal)
Katrin Wondraczek, Leibniz Institute of Photonic Technology (Germany)


Published in SPIE Proceedings Vol. 11207:
Fourth International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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