@ARTICLE{Świrniak_Grzegorz_Non-invasive_2020, author={Świrniak, Grzegorz}, volume={vol. 27}, number={No 1}, journal={Metrology and Measurement Systems}, pages={19-31}, howpublished={online}, year={2020}, publisher={Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation}, abstract={This paper presents a non-invasive measurement method for simultaneous characterization of diameter and refractive index of transparent fibres. The method is based on scattering of a polychromatic beam of light by a side-illuminated fibre under study. Both quantities of interest are inversely calculated from the scattering far-field region in the vicinity of the primary rainbow. The results of practical measurements are examined with the use of a novel optical system for laboratory-level tests. An analysis of prediction errors for 20– 120 μm thick fibres having various refractive indices helps to assess the outcome of the measurement data. The results show a clear route to improve the measurement process in on-line industrial process control.}, type={Article}, title={Non-invasive mesurements of transparent fibres}, URL={http://www.journals.pan.pl/Content/115045/PDF/02_MMS_1_2020.pdf}, doi={10.24425/mms.2020.131714}, keywords={fibre characterization, scattering measurements, inverse scattering}, }