Abstract The complex refractive index of crude oils is an essential parameter for the study of radiative properties, which has important and wide applications in remote sensing analysis and identification of oil pollution. In this paper, a combined Brewster–transmission method for determining the complex refractive index was proposed. The method has a good performance for both strong and weak absorption liquids. The root-means-square error is less than 0.2% for the refractive index, and 10.0% for the absorption index. Furthermore, the complex refractive index of two crudes was measured by this method and the radiative properties of oil droplets and coated oil droplets were calculated using MIE theory. The research shows that the droplets exhibit significant forward scattering characteristics, and the scattering develops to further forward with size parameter increase. The coating significantly affects the radiative properties of droplets, causing the absorption efficiency to increase, and the scattering efficiency to decrease.

中文翻译：

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结合布鲁斯特透射法测定原油的复折射率

摘要 原油的复折射率是研究辐射特性的重要参数，在遥感分析和石油污染识别中具有重要而广泛的应用。在本文中，提出了一种确定复折射率的组合布鲁斯特透射法。该方法对强吸收液和弱吸收液均具有良好的性能。折射率的均方根误差小于 0.2%，吸收指数的均方根误差小于 10.0%。此外，通过该方法测量了两种原油的复折射率，并使用 MIE 理论计算了油滴和包覆油滴的辐射特性。研究表明，液滴表现出显着的前向散射特性，随着尺寸参数的增加，散射进一步向前发展。涂层显着影响液滴的辐射特性，导致吸收效率增加，散射效率降低。