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Sensors 2010, 10(4), 3815-3823; doi:10.3390/s100403815

Optical Sensor for Characterizing the Phase Transition in Salted Solutions

1
Laboratoire Régional des Ponts et Chaussées de Nancy, Centre d’ Études Techniques de l’ Équipement de l’Est – 71 rue de la grande haie, 54510 Tomblaine, France
2
Laboratoire Matériaux Optiques, Photonique et Systèmes, University Paul Verlaine of Metz and Supélec – 2 rue Edouard Belin, 57070 Metz, France
*
Author to whom correspondence should be addressed.
Received: 11 February 2010 / Revised: 27 February 2010 / Accepted: 17 March 2010 / Published: 14 April 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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Abstract

We propose a new optical sensor to characterize the solid-liquid phase transition in salted solutions. The probe mainly consists of a Raman spectrometer that extracts the vibrational properties from the light scattered by the salty medium. The spectrum of the O-H stretching band was shown to be strongly affected by the introduction of NaCl and the temperature change as well. A parameter SD defined as the ratio of the integrated intensities of two parts of this band allows to study the temperature and concentration dependences of the phase transition. Then, an easy and efficient signal processing and the exploitation of a modified Boltzmann equation give information on the phase transition. Validations were done on solutions with varying concentration of NaCl.
Keywords: Raman sensor; phase transition; salted solution Raman sensor; phase transition; salted solution
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Claverie, R.; Fontana, M.D.; Duričković, I.; Bourson, P.; Marchetti, M.; Chassot, J.-M. Optical Sensor for Characterizing the Phase Transition in Salted Solutions. Sensors 2010, 10, 3815-3823.

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