Calibration of light-scattering instruments. III. Absolute angular intensity measurements on mie scatterers

The absolute angular scattered intensities for a Mie scattering system have been determined. A Dow polystyrene latex of large diameter (D_EM = 1.305 μ) was studied with unpolarized, vertically polarized, and horizontally polarized incident light. The necessary expressions relating the geometrical, optical, and calibration constants of a Brice-Phoenix photometer with the quantities directly related to the Mie intensity functions were developed. Two features of the experimental technique were explored in detail: the use of polarized incident radiation and the effect of the solid angle subtended by the receiver aperture. Generally, excellent agreement between the theoretical Mie intensity functions and the corresponding experimental absolute intensities was obtained over the whole angular range.