Abstract

The determination of particle size distribution p(r)_m, σ, r) (r⁼ particle dimension, r_m= <r>, σ = <r²>) from scattering/extinction data that can be expressed as has long been investigated and several methods have been developed. The downhill simplex is a nonlinear curve fitting technique which, by assuming a suitable two-parameter distribution f(r_m, σ, r), evaluates the distribution at any three sets of (r_m, σ) and then changes the parameters in a special way until q, the deference between trial data t = K·f and s = K·p reaches minimum.

© 1991 Optical Society of America