Skip to Main content Skip to Navigation
Theses

Analyse d’aérosols par méthodes LIBS sans étalonnage et LIBS couplée à une cellule radiofréquence utilisée comme piège à particules

Abstract : New issues related to process control and workplace surveillance accompany the emergence of nanotechnology industry. This involves the development of new real-time and in-situ characterization techniques. In this context, the NOVA unit from the INERIS institute collaborated with LP3 and GREMI laboratories to study two approaches aiming to enhance the LIBS technic performances. The first approach used a flow cell to determine the relative elemental composition of an aerosol with a calibration-free procedure. The recorded spectra were compared to theoretical spectra calculated for a plasma in the Local Thermodynamic Equilibrium LTE. The best agreement between recorded and computed spectra allowed the determination of the relative composition with a good agreement with the reference value, for an alumina aerosol. The study of the temporal evolution of the plasma allowed the estimation of a temporal range within which the LTE hypothesis was verified. The second approach used a low-pressure radiofrequency plasma generated in an inert gas as a particle trap to analyse aerosols and nanoparticles. The use of such a system allowed the enhancement of particles detection by concentrating them spatially. We determined the optimal parameters for the LIBS analysis using this system. Furthermore, we established the plasma continuum was attenuated even at very low time delays. We evaluated the sampling volume of this new system and compared it to case of LIBS analysis on air. Finally, we estimated the detection limits of this system when analysing nanoparticles.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-01713110
Contributor : Abes Star :  Contact
Submitted on : Tuesday, February 20, 2018 - 11:03:08 AM
Last modification on : Thursday, March 5, 2020 - 6:49:28 PM

File

mohamed-boudhib_3518_vd.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01713110, version 1

Collections

Citation

Mohamed Boudhib. Analyse d’aérosols par méthodes LIBS sans étalonnage et LIBS couplée à une cellule radiofréquence utilisée comme piège à particules. Autre [cond-mat.other]. Université d'Orléans, 2017. Français. ⟨NNT : 2017ORLE2011⟩. ⟨tel-01713110⟩

Share

Metrics

Record views

177

Files downloads

420