Atmospheric aerosol characterization using multi-wavelength, multistatic light scattering
Document ID: 206
Brown, Andrea M.1
Snyder, Michelle Grace2
Brouwer, Lydia4
Philbrick, C. Russell1,2,3
1 The Pennsylvania State University, Department of Electrical Engineering, University Park, PA, U.S.A.
2 North Carolina State University, Department of Physics, Raleigh, NC, U.S.A.
3 North Carolina State University, Department of Marine, Earth and Atmospheric Sciences, Raleigh, NC, U.S.A.
4 Alion Science and Technology, Research Triangle Park, NC, U.S.A.
Abstract
A sensor for measuring scattering at multiple wavelengths and multiple angles has been designed and is being tested for the characterization of atmospheric aerosols. Charge coupled device (CCD) imagers are used to record scattering measurements at two polarizations and as a function of angle relative to the co-aligned laser beams. A diffraction grating is used to spatially separate the wavelengths across the field-of-view of the CCD array, allowing simultaneous measurements at multiple wavelengths. Experiments are conducted to measure the scattering intensities for two polarizations at discrete wavelengths that span the visible spectrum. The data from the CCD images are inverted using a genetic algorithm and Mie scatter equations to determine aerosol properties of artificially generated fog. The results are compared with in-situ measurements of the aerosol size distribution and concentration using an aerodynamic particle sizer spectrometer and a condensation particle counter.
Keywords: aerosol characterization, aerosol size distribution, multi-static lidar, multi-wavelength lidar, polarization ratio, scattering phase function
| Citation: | "Atmospheric aerosol characterization using multi-wavelength, multistatic light scattering", Brown, A. M., M. G. Snyder, L. Brouwer, C. R. Philbrick, Laser Radar Technology and Applications XV, Vol. 7684, SPIE, 2010, pp. 76840I-1 - 76840I-11, DOI: 10.1117/12.850080, CCC: 0277-786X/10 |