Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Posters II
DY 30.50: Poster
Thursday, March 25, 2010, 16:00–18:00, Poster C
The mean free path of photons in granular media — •Sonia Utermann1,2, Jonathan Kohler2,3, and Matthias Schröter2 — 1Georg August Universität Göttingen — 2Max-Planck-Institut für Dynamik und Selbstorganisation — 3Vanderbilt University
Light transport is a powerful tool for probing the dynamics of dense, multiply scattering media. We use it to measure the kinetic granular temperature of a water-fluidised bed of glass spheres. This contribution shows our quest for the necessary light transport length scale: the photon mean free path, l∗. We measure l∗ using both transmission and incoherent backscattering and present our results as a function of (a) the packing density of the grains; (b) the size of the grains; (c) their refractive index; and (d) their surface roughness.