Two-dimensional angular optical scattering (TAOS) measurements of single airborne microparticles: transition to clusters and dual-wavelength absorption studies

Stephen Holler; Mario Surbek; Yongle Pan; Richard K. Chang

doi:10.1117/12.372847

21 December 1999 Two-dimensional angular optical scattering (TAOS) measurements of single airborne microparticles: transition to clusters and dual-wavelength absorption studies

Stephen Holler, Mario Surbek, Yongle Pan, Richard K. Chang

Author Affiliations +

Proceedings Volume 3853, Environmental Monitoring and Remediation Technologies II; (1999) https://doi.org/10.1117/12.372847
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

We extend our previous work on two-dimensional angular optical scattering (TAOS) patterns to water droplets with inclusions and absorption studies at two different wavelengths. Using an acoustic levitator, the TAOS from water droplets containing polystyrene latex sphere inclusions is observed as the droplet evaporates leaving only a dry aggregate of spheres. Dramatic changes in the TAOS patterns occur even when the droplet still has a large volume fraction of water. Two wavelengths (266 nm and 532 nm) are used to examine the TAOS patterns from droplets containing tryptophan. The effect absorption has on the angular scattering peaks is presented. Such dual wavelength measurements can provide useful information to those working on the inverse problem.

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Stephen Holler, Mario Surbek, Yongle Pan, and Richard K. Chang "Two-dimensional angular optical scattering (TAOS) measurements of single airborne microparticles: transition to clusters and dual-wavelength absorption studies", Proc. SPIE 3853, Environmental Monitoring and Remediation Technologies II, (21 December 1999); https://doi.org/10.1117/12.372847

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