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

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...

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Bibliographic Details
Published in:Applied optics (2004) 2015-10, Vol.54 (28), p.8453-8458
Main Authors: Sobral, H, Peña-Gomar, M
Format: Article
Language:English
Subjects:
Critical angle
Dispersions
Mathematical analysis
Reflectivity
Refractive index
Refractivity
Spectroscopy
Wavelengths
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Summary: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 10(-4) 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.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.008453