FIBRE-OPTIC SENSOR FOR SIMULTANEOUS MEASUREMENT OF THICKNESSAND REFRACTIVE INDEX OF LIQUID LAYERS - Publication - Bridge of Knowledge

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FIBRE-OPTIC SENSOR FOR SIMULTANEOUS MEASUREMENT OF THICKNESSAND REFRACTIVE INDEX OF LIQUID LAYERS

Abstract

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.

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Keywords

Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
Metrology and Measurement Systems no. 26, pages 561 - 568,
ISSN: 0860-8229
Language:
English
Publication year:
2019
DOI:
Digital Object Identifier (open in new tab) 10.24425/mms.2019.129584
Sources of funding:
Verified by:
Gdańsk University of Technology

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