Light Scattering from Irregular Dielectric Particles.
Final rept. 1 Mar 75-28 Feb 78,
FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL ENGINEERING
Pagination or Media Count:
A digital polar nephalometer has been constructed to measure the intensity and polarization of light pulses scattered into 94 angles from 9 to 176 deg. from monodisperse aerosol particles of controlled shape. The light source was a tunable dye laser giving 10 kW 4 ns pulses, operated at 627 nm. Calibration data from polystyrene latex spheres agrees with Mie theory within about 10. Data for spheroidal 2 micrometers cladosporium and quasi-cubical 4 micrometers NaCl particles are shown. It is found that the backscatter from non-spherical particles of size parameter about 10 differs significantly from that for the best fit sphere, so that a tumbled irregular particle is not equivalent to a sphere.
- Electricity and Magnetism