Method and device for determination of parameters of individual microparticles

摘要

A method and device for determination of absolute values of the size and the refractive index of individual microparticles. An optical scanning device for measurement of angular scattering pattern from individual microparticles is described. The light scatter is measured in different angles from moving particles inside the scanning optical system and the values and the angular locations of minima and maxima of the scattering pattern are registered. The size and the refractive index of individual microparticles are calculated from the registered minima and maxima using an empirical equation. An empirical equation has been derived from statistical analysis of angular scattering patterns. These patterns have been calculated on the basis of Mie scattering theory.