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


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Daniel DAUGERON1, Jean-Baptiste RENARD2, Bertrand GAUBICHER2, Benoît COUTÉ2 ,Edith HADAMCIK3, François GENSDARMES4, Guillaume BASSO4 and Corinne FOURNIER5

Revue Applied optics, Volume 45, Issue 32, 10 November 2006, Pages 8331-8337  - DOI: 10.1364/AO.45.008331

Type de document > *Article de revue

Mots clés > particules, poussière

Unité de recherche > IRSN/DSU/SERAC

Auteurs > BASSO Guillaume, GENSDARMES François

Date de publication > 10/11/2006

Résumé

Measuring linear polarization of light scattered by a cloud of particles can help to retrieve their physical properties. Here we start an extensive study of polarimetric measurements of sand grains that can be found on the surface and in the atmosphere of Earth. Different techniques of measurements are compared using the LaMP nephelometer and PROGRA2 on ground and in microgravity during parabolic flights. The techniques used on ground bias the measurements. When the grains are lifted by air draught, differentiation is produced in the size distribution and nature of floating particles. When the grains are carried along with air flow, some grains become oriented along the flow direction at air speeds greater than a few m/s, producing abnormal negative polarization. On the other hand, measurements conducted under microgravity permit retrieval of the bulk optical properties of lifted sand grains with size greater than tens of micron.

1) D. Daugeron (daugeronx@moniut.univ-bpclermont.fr) is with the Laboratoire de Météorologie Physique, Université Blaise Pascal, 24 avenue des Landais, F-63177 Aubière cedex, France.
2) J.-B. Renard (jbrenard@cnrs-orleans.fr), B. Gaubicher, and B. Couté are with the Laboratoire de Physique et Chimie de l’Environnement, 3A avenue de la recherche scientifique, F-45071 Orléans cedex 2, France.
3) E. Hadamcik (edith.hadamcik@aerov.jussieu.fr) is with the Service d’Aéronomie, BP3, F-91371 Verrières le Buisson cedex, France.
4) François Gensdarmes (francois.gensdarmes@irsn.fr) and Guillaume Basso (guillaume.basso@irsn.fr) are with the Institut de Radioprotection et de Sûreté Nucléaire, BP 68, F-91192 Gif-sur-Yvette, France.
5) Corinne Fournier is with the Laboratoire Traitement du Signal et Instrumentation, 18 rue du Professeur Benoît Lauras, F-42000 Saint-Etienne, France.