Using a laser aureole to study aerosols

Brandon J. N. Long; D. A. Hook; Garrett E. Pangle; Hans D. Hallen; C. Russell Philbrick

doi:10.1117/12.2017707

20 May 2013 Using a laser aureole to study aerosols

Brandon J. N. Long, D. A. Hook, Garrett E. Pangle, Hans D. Hallen, C. Russell Philbrick

Proceedings Volume 8731, Laser Radar Technology and Applications XVIII; 87310O (2013) https://doi.org/10.1117/12.2017707
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

Aerosol optical scattering experiments are often large, expensive, and provide poor control of dust uniformity and size distribution. The size distribution of such suspended atmospheric aerosols varies rapidly in time, since larger particles settle quickly. Even in large chambers, 10 micron particles settle in tens of seconds. We describe lab-scale experiments with stable particle distributions. A viscous colloidal solution can stabilize the particles for sufficient time to measure optical scattering properties. Colloids with different concentrations or size distributions enable nearly time independent studies of prepared distributions. We perform laser aureole scattering from a colloid containing a few percent by volume of Arizona Road Dust (ARD) in mineral oil and glycerin, and 1-micron polystyrene spheres in water. We discuss aureole analysis, the differences expected in scattering properties due to the index of refraction of the mineral oil medium versus air, and the impact of non-spherical shape on the scattering. This research demonstrates that particles suspended in a viscous medium can be used to simulate aerosol optical scattering in air, while enabling signal averaging, offering reproducibility, and easing problems resulting from parameter variations in studies of dust properties.

Citation Download Citation

Brandon J. N. Long, D. A. Hook, Garrett E. Pangle, Hans D. Hallen, and C. Russell Philbrick "Using a laser aureole to study aerosols", Proc. SPIE 8731, Laser Radar Technology and Applications XVIII, 87310O (20 May 2013); https://doi.org/10.1117/12.2017707

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