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Faisabilité d'un capteur spectroscopique proche infrarouge pour la détermination chimiométrique de cractéristiques physico-chimiques de matériaux plats en cours de fabrication

Abstract : Flat materials manufacturing industries need on-line measurement systems which make features control possible. Multilayer plastic films are particularly used for food packaging thanks to their tightness properties. Measurement of barrier layers thickness is the most interesting part, but current on-line analysis techniques do not enable discrimination. So, the aim is to develop an infrared spectroscopic sensor able to measure one or several layers by adapting chemometrical models.
Near infrared compared to mid infrared allows the analysis of a larger range of thickness, but increases interference fringes because of low absorbances. This problem is treated by mathematical methods such as Fast Fourier Transform and wavelets. An instrumental configuration based on polarization theory and Brewster's angle was found to be the most efficient.
Highly capable predictive models for monolayer films have been developed by PLS regression. Study of multilayer films required reference method, because none is established nowadays. Different methods such as scanning electron microscopy and spectroscopic ellipsometry have been tested. Finally, stack of monolayer samples of known thickness has supplied better results. These have been confirmed by low coherence optical reflectometry. So, near infrared spectroscopy coupled with chemometrics is a powerful tool for quantitative analysis of plastic films.
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Submitted on : Friday, April 4, 2008 - 10:48:30 AM
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Séverine Trupin. Faisabilité d'un capteur spectroscopique proche infrarouge pour la détermination chimiométrique de cractéristiques physico-chimiques de matériaux plats en cours de fabrication. Autre. Université des Sciences et Technologie de Lille - Lille I, 2007. Français. ⟨tel-00270241⟩

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