AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Characterization of Aerosols by Forward Light Scattering
PAUL LANE, Matthew B. Hart, Brian Saar, Jay D. Eversole, Naval Research Laboratory
Abstract Number: 604 Working Group: Single Aerosol Particle Studies - Techniques and Instrumentation
Abstract Environmental, health and security concerns are driving our interest in techniques to characterize airborne particles in real time. The primary cause of attenuation of incident radiation in aerosols is scattering, which is a function of the complex refractive index and the size and shape of particles. Light scattering varies significantly over wavelengths near absorption maxima, because the complex refractive index varies over this interval. This feature can be exploited to determine the absorption peak(s) of particles, and hence, their composition. Using silica particles as a test case, we differentiate bare particles from those thinly coated by an organic dye (rubrene) with an absorption maxima bracketed by three incident lasers. Experimental results on spherical and non-spherical particles will be compared and contrasted.