Paper
28 May 2013 Optical extinction dependence on wavelength and size distribution of airborne dust
Author Affiliations +
Abstract
The optical scattering from laser beams propagating through atmospheric aerosols has been shown to be very useful in describing air pollution aerosol properties. This research explores and extends that capability to particulate matter. The optical properties of Arizona Road Dust (ARD) samples are measured in a chamber that simulates the particle dispersal of dust aerosols in the atmospheric environment. Visible, near infrared, and long wave infrared lasers are used. Optical scattering measurements show the expected dependence of laser wavelength and particle size on the extinction of laser beams. The extinction at long wavelengths demonstrates reduced scattering, but chemical absorption of dust species must be considered. The extinction and depolarization of laser wavelengths interacting with several size cuts of ARD are examined. The measurements include studies of different size distributions, and their evolution over time is recorded by an Aerodynamic Particle Sizer. We analyze the size-dependent extinction and depolarization of ARD. We present a method of predicting extinction for an arbitrary ARD size distribution. These studies provide new insights for understanding the optical propagation of laser beams through airborne particulate matter.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Garrett E. Pangle, D. Adam Hook, Brandon J. N. Long, C. Russell Philbrick, and Hans D. Hallen "Optical extinction dependence on wavelength and size distribution of airborne dust", Proc. SPIE 8731, Laser Radar Technology and Applications XVIII, 87310N (28 May 2013); https://doi.org/10.1117/12.2017850
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KEYWORDS
Particles

Atmospheric particles

Scattering

Multiple scattering

Laser scattering

Aerosols

Absorption

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