The Quasi Crystalline Approximation (QCA) is an approximated solution of the Foldy-Lax vector multiple scattering equation of light. it provides the evaluation of the configuration average scattering coefficient of a three-dimensional ensemble of spherical particles by taking into account the electromagnetic couplings up to the pair correlation function.
The Interference Approximation (ITA) also allows calculating the configuration average scattering coefficient of a three-dimensional ensemble of spherical particles assuming single coherent scattering.
Both models can be coupled to the N-Flux module, to evaluate the reflection and transmission coefficient of dense heterogeneous media.
Coupling QCA and N-Flux model calculations
Contrast ratio of paint films a function of the film thickness and HPP VVC
Scattering efficiency of Hollow Polymer Particles via QCA and ITA
Effect of the variation in void volume concentration (VVC)