Angular scattering measurements and calculations of rough spherically shaped carbon particles.

An angular scatterometer (goniometer) was designed and built which is capable of measuring the S11 and S12 components of the scattering matrix on single particles as a function of the scattering angle (Theta) for different values of the azimuthal angle (phi) . The particle is electrostatically charged and is levitated in an electrodynamic levitator (EDL). The EDL is positioned in such a way that the particle is in the center of a semicircular detector ring which can be rotated around the particle so that different scattering planes can be measured. Spherically shaped porous carbon particles (spherocarbs) serve as candidate particles for experimental and theoretical investigations of scattering in various planes. Results are compared to theoretical modeling of stochatistic rough particles in order to assess the influence of shape and surface roughness.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.