Couplage ablation laser et imagerie spectrale rapide pour identification et analyses de plastiques : concept, développement et validation

Abstract : Laser Induced Breakdown Spectroscopy (LIBS) is an analytical technique based on the emission of a plasma arising from the laser-matter interaction. All the elements of the periodic table can be detected with a detection limit close to the ppm, regardless of the nature of sample: solid, liquid or gas. LIBS can perform elemental as well as molecular analysis, which makes it a trustworthy technique for the identification of organic materials, especially with reference to plastic waste sorting where the established techniques experience some difficulties to fulfill all the requirements of this issue. Nevertheless, the laser-induced plasma is a transient and inhomogeneous process regularly hard to master in comparison with an inductively coupled plasma. As a consequence, LIBS technique still remains marginal for the applications demanding a reliable and frequently quantitative information. This doctoral research, which falls within the framework of a partnership between the CRITT Matériaux Alsace and the Institut Lumière Matière in Lyon, proposes to examine the two issues mentioned above. A new LIBS instrument is first given. It is organized around several monitoring tools driven by a dedicated software which allowed us to considerably reduce the fluctuations of the LIBS signal coming from the different factors involved in the process of laser ablation (laser energy, sample and detection positions, etc…). The efficiency of this new LIBS instrument is then illustrated through the example of the quantification of trace elements in glass matrices
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Submitted on : Thursday, September 15, 2016 - 3:20:07 PM
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Erwan Negre. Couplage ablation laser et imagerie spectrale rapide pour identification et analyses de plastiques : concept, développement et validation. Optique [physics.optics]. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSE1036⟩. ⟨tel-01366887⟩

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