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Determination of the refractive index of glucose-ethanol-water mixtures using spectroscopic refractometry near the critical angle

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Abstract

A spectroscopic refractometer was used to investigate the dispersion curves of ethanol and D-glucose solutions in water near the critical angle; here, the reflectivity was measured using a white source. Dispersion curves were obtained in the 320–1000 nm wavelength range with a resolution better than 104 for the refractive index, n. The differential refractive index is measured as a function of wavelength, and a simple expression is proposed to obtain the refractive index of the glucose-ethanol-water ternary system. Using this expression, combined with the experimental differential refractive index values, the concentrations of individual components can be calculated.

© 2015 Optical Society of America

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