Applied Optics, Volume 32, No. 33, pp. 6834-6840 (20 November 1993)We made multiple-wavelength light transmission measurements at the edge of a plume from a small
solid-propellant motor in order to determine the mean particle size and the in situ particle index of
refraction. We retrieved the particle size distribution from the Sauter mean diameter and the
geometrical standard deviation assuming a lognormal distribution. The good correlation of the data
indicated the applicability of the technique with a relatively high confidence level and that submicrometer
particles were dominantly present at the edge of the plume..
