Light scattering by particles immersed in an absorbing host medium has been an important issue in many fields, such as ocean optics, atmospheric radiation, remote sensing and so on. The traditional theory ignores the effect of host medium absorption on particle scattering, which may result in inaccurate results. In this paper, the scattering coefficient, extinction coefficient and phase function of the dispersed medium consisting of optically soft particles are investigated with considering the effect of host medium absorption on particle scattering. The results are based on the recently developed Mie theory for the absorbing host medium. It is found that neglecting the host medium absorption on particle scattering will result in a small change in extinction coefficients but a great change in scattering coefficients. Meanwhile, the relative error of scattering coefficients caused by using the conventional Mie theory increases obviously with the increase of particle size and the absorption index of the host medium, while the relative error of extinction coefficients fluctuates with the particle size. Moreover, the relative error of scattering coefficients of polydisperse particles is more significant than that of monodisperse particles.

在许多领域，例如海洋光学，大气辐射，遥感等领域，浸没在吸收性基质中的粒子对光的散射一直是一个重要问题。传统理论忽略了宿主介质吸收对粒子散射的影响，这可能导致结果不准确。在本文中，考虑了基质介质吸收对颗粒散射的影响，研究了由光学软颗粒组成的分散介质的散射系数，消光系数和相函数。结果基于最近开发的吸收宿主介质的Mie理论。发现忽略颗粒散射对基质介质的吸收将导致消光系数的小变化，但散射系数的大变化。与此同时，常规米氏理论引起的散射系数的相对误差随着粒径和基质吸收系数的增加而明显增加，而消光系数的相对误差则随着粒径的变化而波动。而且，多分散颗粒的散射系数的相对误差比单分散颗粒的散射系数的相对误差更大。