G. Göbel, J. Kuhn, and J. Fricke
Dependent Scattering Effects in Latex Sphere Suspensions and Scattering Powders
Waves in Random Media 5(1995) 413-426
Abstract:
The dependent scattering effects in loose ideal latex sphere suspensions
and of beds of irregularly shaped powder grains are theoretically described
by means of a coherent addition formalism together with the statistical
Percus-Yevic hard sphere model for the particle separation.
Measurements are performed with a light scattering apparatus and a linear
photo diode array. The latter allows to separate scattered and
directly transmitted radiation and thus to derive the scattering
cross section of the spheres in dependence of their volume fraction.
For high volume fractions a decrease of scattering efficiency occurs in
the calculated as well as the measured cross sections.
For TiO2 powders a similar behaviour of the effective scattering and
absorption cross section is derived for the near and mid infrared region.
The relevant quantities are obtained from directional-hemispherical
transmission and reflection measurements using a three flux model.
Due to the irregular shape of the powder grains Mie scattering theory
has to be modified for each powder to fit the experimental data.
