2-DIMENSIONAL ANGULAR OPTICAL-SCATTERING FOR THE CHARACTERIZATION OF AIRBORNE MICROPARTICLES

Two-dimensional angular optical scattering (TAOS) is recorded for seve ral particle shapes and configurations. A lens is used to collect a la rge solid angle of the light and transform the angular profile into a planar distribution according to the Abbe sine condition. Qualitative agreement is found between experiment and theory for the TAGS from sph eroids having the same aspect ratio but different sizes. A distinctive irregular island structure is observed in the TAGS from clusters of B acillus subtilis spores and polystyrene latex spheres. The density per solid angle of these islands is found to increase with cluster diamet er. (C) 1998 Optical Society of America.