球形颗粒混合物的光散射特性降低：一种源自米氏计算的简单近似方法。

Reduced light-scattering properties for mixtures of spherical particles: a simple approximation derived from Mie calculations.

作者信息

Graaff R, Aarnoudse J G, Zijp J R, Sloot P M, de Mul F F, Greve J, Koelink M H

出版信息

Appl Opt. 1992 Apr 1;31(10):1370-6. doi: 10.1364/AO.31.001370.

DOI:10.1364/AO.31.001370

PMID:20720767

Abstract

The reduced scattering cross section per unit of volume Sigma'(s) identical withSigma(s)(1 - g) is an important parameter to describe light propagation in media with scattering and absorption. Mie calculations of the asymmetry factor g for nonabsorbing spheres and Q(sca), the ratio of the scattering cross section Sigma(s) and the particle cross section, show that Q(sca)(1 - g) = 3.28x(0.37)(m - 1)(2.09) is true to within a few percent, when the Mie parameters for relative refractive index m and size x are in the ranges of 1 < m </= 1.1 and 5 < x < 50, respectively. A ratio of reduced scattering cross sections for radiation at two wavelengths is also independent of the size within the range mentioned, even for mixtures of different size spheres. The results seem promising for biomedical applications.

摘要

每单位体积的约化散射截面Σ'(s) 等同于Σ(s)(1 - g)，是描述光在具有散射和吸收的介质中传播的一个重要参数。对于非吸收性球体的不对称因子g以及散射截面Σ(s)与粒子截面之比Q(sca)的米氏计算表明，当相对折射率m和尺寸x的米氏参数分别在1 < m ≤ 1.1和5 < x < 50范围内时，Q(sca)(1 - g) = 3.28x(0.37)(m - 1)(2.09)在百分之几的误差范围内成立。即使对于不同尺寸球体的混合物，在上述范围内两个波长处辐射的约化散射截面之比也与尺寸无关。这些结果在生物医学应用方面似乎很有前景。