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Etude de l'interaction laser-matière appliquée à la décontamination de peintures

Francois Brygo 1
1 LILM - Laboratoire d'Interaction Laser Matière
DPC - Département de Physico-Chimie : DEN/DPC/SCP/LILM
Abstract : In nuclear industry, the paint layer on the walls must be removed during dismantling or maintenance operation. Laser ablation of the paint layer allows to reduce the generated waste volume, compared to the current techniques.
Paints consist of a polymeric base in which fillers and pigments are included. The energy deposition of the laser beam in this turbid medium is studied using a multiple scattering model, and measurements of reflection / transmission of beam through thin layers.
The paint ablation is studied with several Nd : YAG lasers and a TEA-CO2 laser, allowing to modify the fluence, the wavelength, the pulse duration, the repetition rate and the number of shots. Experimental set up were carried out, and the parametric tests allow to define the optimal ablation parameters, in term of ablation efficiency.
Ablation at high repetition rate is studied using an optical pyrometer and a specifically developed thermal model. Measurements and modeling highlight the heat accumulation that appears at high repetition rate. This accumulation allows to reduce the ablation threshold fluence and to increase the ablation efficiency.
Analyses of the interaction and ablation regimes are proposed on the basis of the experimental results and models, and allow to optimise the decontamination process.
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https://tel.archives-ouvertes.fr/tel-00011392
Contributor : Francois Brygo <>
Submitted on : Saturday, December 8, 2007 - 12:16:08 PM
Last modification on : Friday, October 23, 2020 - 4:48:46 PM
Long-term archiving on: : Monday, April 12, 2010 - 6:39:50 AM

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  • HAL Id : tel-00011392, version 1

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Francois Brygo. Etude de l'interaction laser-matière appliquée à la décontamination de peintures. Physique Atomique [physics.atom-ph]. Université de Bourgogne, 2005. Français. ⟨tel-00011392⟩

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