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Scattering properties of sands. 1. Comparison between different techniques of measurements


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Titre de la revue : Applied Optics Volume : 45 N° : 32 Pagination : 8331-8337 Date de publication : 10/11/2006

Type de document > *Article de revue

Mots clés >

Unité de recherche > IRSN/DSU/SERAC/LPMA

Auteurs > BASSO Guillaume, COUTE Benoît, DAUGERON Daniel, FOURNIER Corinne, GAUBICHER Bertrand, GENSDARMES François, HADAMCIK Edith, RENARD Jean-Baptiste

Date de publication > 10/11/2006

Résumé

Measuring linear polarization of light scattered by a cloud of particles can help retrieve their physical properties. We present an extensive study of polarimetric measurements of sand grains that can be found on the surface and in the atmosphere of the Earth. Different techniques of measurements are compared using the Laboratoire de Météorologie Physique nephelometer on the ground and the Propriétés Optiques des Grains Astronomiques et Atmosphériques on the ground and in microgravity during parabolic flights. The techniques used on the ground bias the measurements. When the grains are lifted by an air draft, differentiation is produced in the size distribution and the nature of the floating particles. When the grains are carried along with the airflow, some grains become oriented along the flow direction at air speeds greater than a few meters per second, producing abnormal negative polarization. On the other hand, measurements conducted under microgravity permit the retrieval of the representative optical properties of the lifted sand grains with sizes greater than tens of micrometers.