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Sensors 2017, 17(12), 2844; https://doi.org/10.3390/s17122844

A Wavefront Division Polarimeter for the Measurements of Solute Concentrations in Solutions

1
Centro de Investigaciones en Optica, Loma del Bosque 115, Leon 37150, Mexico
2
Departamento de Ingenierias Quimica, Electrónica y Biomedica, Division de Ciencias e Ingenierias, Universidad de Guanajuato Campus Leon, Loma del bosque 103, Leon 37150, Mexico
*
Author to whom correspondence should be addressed.
Received: 27 October 2017 / Revised: 28 November 2017 / Accepted: 30 November 2017 / Published: 8 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

Polarimeters are useful instruments that measure concentrations of optically active substances in a given solution. The conventional polarimetric principle consists of measuring the rotation angle of linearly polarized light. Here, we present a novel polarimeter based on the study of interference patterns. A Mach–Zehnder interferometer with linearly polarized light at the input is used. One beam passes through the liquid sample and the other is a reference beam. As the linearly polarized sample beam propagates through the optically active solution the vibration plane of the electric field will rotate. As a result, the visibility of the interference pattern at the interferometer output will decrease. Fringe contrast will be maximum when both beams present a polarization perpendicular to the plane of incidence. However, minimum visibility is obtained when, after propagation through the sample the polarization of the sample beam is oriented parallel to the plane of incidence. By using different solute concentrations, a calibration plot is obtained showing the behavior of visibility. View Full-Text
Keywords: polarimeter; interferometer; solutions concentrations; refractive index; specific rotation polarimeter; interferometer; solutions concentrations; refractive index; specific rotation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Calixto, S.; Martinez-Ponce, G.; Garnica, G.; Figueroa-Gerstenmaier, S. A Wavefront Division Polarimeter for the Measurements of Solute Concentrations in Solutions. Sensors 2017, 17, 2844.

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