Double scattering in critically opalescent fluids

Abstract
A procedure is presented for the calculation of the intensity of light doubly scattered by a critically opalescent fluid. The procedure is valid for general scattering angles and fully incorporates the effect of turbidity on the double-scattered light. The intensity and depolarization ratio of double-scattered light is evaluated as a function of temperature, angle, and sample-cell dimensions for some representative liquid mixtures near the critical point of mixing. A comparison with experimental multiple-scattering data is also included.