Two-Dimensional Angular Optical Scattering for the Characterization of Airborne Microparticles

摘要

Two-dimensional angular optical scattering (TAOS) is recorded for several particle shapes and configurations. A lens is used to collect a large 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 TAOS from spheroids that have the same aspect ratio but different sizes. A distinctive irregular island structure is observed in the TAOS from clusters of Bacillus subtilis spores and clusters of polystyrene latex spheres. The density per solid angle of these islands is found to increase with cluster diameter.