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Portable, in-line and low cost refractive index sensor for liquids

Duarte, D. ; Nogueira, R.N. ; Bilro, L.

Portable, in-line and low cost refractive index sensor for liquids, Proc International Conference on Plastic Optical Fibres - POF , Aveiro, Portugal, Vol. , pp. pp88 -1 - pp88 -5, September, 2017.

Digital Object Identifier: ISBN: 978-989-97345-2-4

Abstract
A portable in-line and low cost refractive index sensor for liquids was developed based on the Fresnel reflection, where the critical angle of the totally reflected light between the interface of two media is detected. A LED is used as light source and a POF, with a well-established numeric aperture, will guide the light to the prism surface. The reflected light is detected by a CCD array. Both LED as the CCD are controlled with an electronic board with remote sensing by wireless. A resolution of 1.2 x 10-4 RIU was obtained with a potential cost lower than 100 €.