Using light scattering matrix elements measured by a polar nephelometer, a procedure for estimating the characteristics of atmospheric particulates was developed. A theoretical library data set of scattering matrices derived from Mie theory was tabulated for a range of values of the size parameter and refractive index typical of atmospheric particles. Integration over the size parameter yielded the scattering matrix elements for a variety of hypothesized particulate size distributions. A least squares curve fitting technique was used to find a best fit for the experimental measurements. This was used as a first guess for a nonlinear iterative inversion of the size distributions. A real index of 1.50 and an imaginary index of −0.005 are representative of the smoothed inversion results for the near ground level atmospheric aerosol in Tucson.
© 1980 Optical Society of America
Original Manuscript: April 24, 1980
Published: October 15, 1980
M. Z. Hansen, "Atmospheric particulate analysis using angular light scattering," Appl. Opt. 19, 3441-3448 (1980)