PARTICLE SIZING WITH A SIMPLE DIFFERENTIAL LIGHT-SCATTERING PHOTOMETER - HOMOGENEOUS SPHERICAL-PARTICLES

A simple light-scattering photometer has been designed to measure the angular distribution of the intensity of polarized laser Light scatter ed by micrometer and submicrometer samples. The photometer uses an ell ipsoidal reflector and simple optical components to collect the Pie-Ne laser-scattered light and to focus it onto a 512-element photodiode a rray. Experimental data have been obtained for several monodisperse aq ueous solutions of latex spheres of different sizes. The results have been satisfactorily interpreted on the basis of the electromagnetic sc attering theory. in particular the Mie formulation has been properly r eformulated to take into account the corrections to the scattered inte nsity determined by the apparatus design making it possible to pet-for m particle sizing. (C) 1997 optical Society of America.