Diffusive Wave Spectroscopy of a random close
packing of spheres |
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Authors: | J Crassous |
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Institution: | (1) Groupe Matière Condensée et Matériaux UMR CNRS 6626, Université de Rennes1, Campus de Beaulieu, Batiment 11A, 35042 Rennes Cedex, France |
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Abstract: | We are interested in the propagation of light in a
random packing of dielectric spheres within the geometrical optics
approximation. Numerical simulations are performed using a ray
tracing algorithm. The effective refractive indexes and the
transport mean free path are computed for different refractive
indexes of spheres and intersticial media. The variations of the
optical path length under small deformations of the spheres
assembly are also computed and compared to the results of
Diffusive Wave Spectroscopy experiments. Finally, we propose a
measure of the transport mean free path and a Diffusive Wave
Spectroscopy experiment on a packing of glass spheres. The results
of those experiments agree with the predictions of this ray
tracing approach. |
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Keywords: | 42 25 Dd Wave propagation in random media 78 35 +c Brillouin and Rayleigh scattering other light scattering 81 05 Rm Porous materials granular materials |
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