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Title: Spectroscopic refractometer for transparent and absorbing liquids by reflection of white light near the critical angle

Abstract

We propose and evaluate a spectroscopic refractometer device to measure the refractive index dispersion of transparent and absorbing solutions. The angle-dependent reflectivity of a white beam of light in an internal reflection configuration around the critical angle is spectrally analyzed. The refractive index in a wavelength range from 400 nm to 900 nm is obtained from the angle-reflectivity curve around the critical angle at each wavelength. The device does not use angle scanning mechanisms, decreasing considerably the complexity of the instrument in comparison to previous proposals. As a result, the measurements are obtained relatively fast. Nevertheless, a good experimental resolution in refractive index of about {Delta}n Almost-Equal-To 10{sup -4} at all the wavelengths is achieved in the case of transparent solutions. The calibration procedure of the device is discussed in detail. We also present measurements of the refractive index dispersion of rhodamine 6G-methanol solutions, which has a strong absorption band in the visible spectra.

Authors:
;  [1]
  1. Centro de Ciencias Aplicadas y Desarrollo Tecnologico, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-186, Distrito Federal 04510 (Mexico)
Publication Date:
OSTI Identifier:
22093992
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABSORPTION; BEAMS; CALIBRATION; CONFIGURATION; DYES; LIQUIDS; OPACITY; PROPOSALS; REFLECTION; REFLECTIVITY; REFRACTIVE INDEX; RESOLUTION; SPECTROSCOPY; VISIBLE SPECTRA; WAVELENGTHS

Citation Formats

Sanchez-Perez, C., and Garcia-Valenzuela, A. Spectroscopic refractometer for transparent and absorbing liquids by reflection of white light near the critical angle. United States: N. p., 2012. Web. doi:10.1063/1.4764565.
Sanchez-Perez, C., & Garcia-Valenzuela, A. Spectroscopic refractometer for transparent and absorbing liquids by reflection of white light near the critical angle. United States. doi:10.1063/1.4764565.
Sanchez-Perez, C., and Garcia-Valenzuela, A. Thu . "Spectroscopic refractometer for transparent and absorbing liquids by reflection of white light near the critical angle". United States. doi:10.1063/1.4764565.
@article{osti_22093992,
title = {Spectroscopic refractometer for transparent and absorbing liquids by reflection of white light near the critical angle},
author = {Sanchez-Perez, C. and Garcia-Valenzuela, A.},
abstractNote = {We propose and evaluate a spectroscopic refractometer device to measure the refractive index dispersion of transparent and absorbing solutions. The angle-dependent reflectivity of a white beam of light in an internal reflection configuration around the critical angle is spectrally analyzed. The refractive index in a wavelength range from 400 nm to 900 nm is obtained from the angle-reflectivity curve around the critical angle at each wavelength. The device does not use angle scanning mechanisms, decreasing considerably the complexity of the instrument in comparison to previous proposals. As a result, the measurements are obtained relatively fast. Nevertheless, a good experimental resolution in refractive index of about {Delta}n Almost-Equal-To 10{sup -4} at all the wavelengths is achieved in the case of transparent solutions. The calibration procedure of the device is discussed in detail. We also present measurements of the refractive index dispersion of rhodamine 6G-methanol solutions, which has a strong absorption band in the visible spectra.},
doi = {10.1063/1.4764565},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 11,
volume = 83,
place = {United States},
year = {2012},
month = {11}
}