Velazco-Roa M A, Thennadil S N
School of Chemical Engineering and Advanced Materials, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
Appl Opt. 2007 Jun 20;46(18):3730-5. doi: 10.1364/ao.46.003730.
A method to extract the complex refractive index of spherical particles from a polydisperse suspension at concentrations where multiple light-scattering effects are significant is presented. The optical constants are estimated from total diffuse reflectance and transmittance measurements and inverting the measurements using the radiative transfer equation (RTE) and the Mie theory for scattering by polydisperse spherical particles. The method is tested by applying it to three different polydisperse polystyrene suspensions and extracting the optical constants of polystyrene particles in the wavelength range of 450-1200 nm. The effect of particle size, concentration, and polydispersity on the estimated values of the optical constants is also discussed.
提出了一种从多分散悬浮液中提取球形颗粒复折射率的方法，该悬浮液浓度下多重光散射效应显著。光学常数通过总漫反射率和透射率测量进行估算，并利用辐射传输方程（RTE）和多分散球形颗粒散射的米氏理论对测量结果进行反演。通过将该方法应用于三种不同的多分散聚苯乙烯悬浮液，并在450 - 1200 nm波长范围内提取聚苯乙烯颗粒的光学常数来对该方法进行测试。还讨论了粒径、浓度和多分散性对光学常数估计值的影响。
