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Sensors 2010, 10(4), 3815-3823;

Optical Sensor for Characterizing the Phase Transition in Salted Solutions

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
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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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. View Full-Text
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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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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