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Fibre-optic sensor for simultaneous measurement of thickness and refractive index of liquid layers

Marzejon Marcin, Karpienko Katarzyna, Mazikowski Adam, Jędrzejewska-Szczerska Małgorzata

Metrology and Measurement Systems

2019

Vol. 26, nr 3

561--568

In this paper, we present a fibre-optic sensor for simultaneous measurement of refractive index and thickness of liquid layers. We designed an experimental low-coherence setup with two broadband light sources and an extrinsic fibre-optic Fabry-Pérot interferometer acting as the sensing head. We examined how the refractive index of a liquid film and its thickness affect spectrum at the output of a fibre-optic interferometer. We performed a series of experiments using two light sources and only one sensing head. The spectra were collected in ranges of 1220-1340 nm and 1500-1640 nm. The obtained results show that using two spectra recorded simultaneously for two wavelength ranges enables to determine thickness in a range of 50-500 μm, and refractive index of a liquid film in a range of 1.00-1.41 RIU using only one sensing head.