Contribution à la caractérisation des propriétés optiques des sables et des suies atmosphériques avec les instruments PROGRA2

Abstract : New polarization and brightness curves as function of scattering angle are studied at _= 632.8 nm and 543.5 nm using PROGRA2 instruments (Propriétés Optiques des Grains Astronomiques et Atmosphériques) for different kinds of soot samples and carbon-black samples levitating in a cloud and deposited on a surface. The soot samples are generated under different combustion conditions, thus affecting their optical properties. A soot generator was also used to study fresh samples issued from propane combustion. A comparison between soot levitating on a cloud and deposited on surface was discussed. Finally these curves are compared to those produced by different kind of sand. The amplitudes of polarization produced by soot differ significantly depending on the primary particle diameter and on size distribution. These curves alone are then not sufficient to estimate the nature of the solid agglomerates that could be detected by remote measurements in the stratosphere. On the other hand the curves of brightness produced by these samples show a behavior different from those produced by the sand samples and that produced by interplanetary dust. It is therefore important in the interpretation of stratospheric measurements to combine the brightness with the polarization curves to identify the nature of the agglomerates and to provide information on the nature of soot detected as the primary particle diameter and size distribution.
Keywords : Brightness
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Mirvatte Francis. Contribution à la caractérisation des propriétés optiques des sables et des suies atmosphériques avec les instruments PROGRA2. Sciences de la Terre. Université d'Orléans, 2011. Français. ⟨NNT : 2011ORLE2014⟩. ⟨tel-00635379⟩

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