Two-dimensional angular optical scattering (TAGS) from acoustically levitated clusters of micro-particles

Summary form only given. The difficulty of airborne micro-particle characterization is often compounded by the myriad of shapes and sizes that occur in nature. Very often airborne micro-particles are not spherical but are aggregates of smaller primary particles. Recently, two-dimensional angular optical scattering (TAOS) has been used to study clusters of polystyrene latex spheres as well as clusters of bacterial spores. Although this TAOS technique was able to show the irregular scattering patterns from clusters, the orientation of the cluster was unknown. We present a new technique for studying TAOS from aggregates in which the cluster orientation is known.