Citation:
Edouard Berrocal, Dmitry Y. Churmakov, Vadim P. Romanov, Mark C. Jermy, Igor V. Meglinski , Crossed source-detector geometry for a novel spray diagnostic: Monte Carlo simulation and analytical results, Applied Optics, Volume 44, Issue 13, 2519-2529, May 2005
Abstract:
Sprays and other industrially relevant turbid media can be quantitatively
characterized by light scattering. However, current optical diagnostic
techniques generate errors in the intermediate scattering regime where the
average number of light scattering is too great for the single scattering to be
assumed, but too few for the diffusion approximation to be applied. Within this
transitional single-to-multiple scattering regime, we consider a novel crossed
source-detector geometry that allows the intensity of single scattering to be
measured separately from the higher scattering orders. We verify Monte Carlo
calculations that include the imperfections of the experiment against analytical
results. We show quantitatively the influence of the detector numerical aperture
and the angle between the source and the detector on the relative intensity of
the scattering orders in the intermediate single-to-multiple scattering regime.
Monte Carlo and analytical calculations of double light-scattering intensity are
made with small particles that exhibit isotropic scattering. The agreement
between Monte Carlo and analytical techniques validates use of the Monte Carlo
approach in the intermediate scattering regime. Monte Carlo calculations are
then performed for typical parameters of sprays and aerosols with anisotropic
(Mie) scattering in the intermediate single-to-multiple scattering regime.