Light scattering by globules in an absorbing medium

The conventional Mie-scattering calculation has been widely used for spherical particles existed in a vacuum and homogeneous nonabsorbing medium. The paper investigates the radiative properties of particles existed in absorbing medium, including light absorption, extinction efficiencies, scattering efficiencies and so on. This study presents milk fat globule in ethyl acetate solution (EAS) and monoethanolamine (MEA) solution including their complex refractive index. The complex refractive index of milk fat globules at 20 °C was measured at 633 nm and was calculated to be 1.46+0.000005i, the complex refractive of EAS was measured at 633nm and was separately calculated to be 1.476 + 0.0005583169i. We considered the calculation difference of the efficiency factors by comparing results from inherent efficiencies and apparent efficiencies of milk fat globule in absorbing medium by simulation in MATALAB. By simulation it is proved that the light scattering by globules is affected by absorbing medium, so modifying Mie scattering calculation is necessary.