Size Determination of Submicron Particles by Owl-Type Photometer

Abstract

A Owl-type photometer designed for measuring the particle size of monodispersed submicron particles was constructed and has been used experimentally for polystyrene latex hydrosols. The angular dependency of the ratio R₁ of the long-wavelength scattering light intensity vertically polarized to the short one are measured and compared with the theoretical relations calculated from Mie's scattering theory.
As a result, it was found that the pattern of the angular dependency of R₁ varies regularly with particle size, and this photometer seems to be capable of the size determination roughly of monodispersed particles in hydrosols.
Quite similar studies of the angular dependency of the polarization ratio of the scattering light were made also, and similar results were obtained.