在前期水面溢油偏振光检测方法的基础上，分析了液面反射光偏振状态在邦加球中的变化，给出了这种测量方法的物理分析。该方法以线偏振光作为入射光源，在入射光的布儒斯特角附近，利用反射光偏振状态在邦加球中轨迹的不同，达到检测不同种类油、水以及不同厚度油膜的目的。进一步以650,850,1064,1310,1550 nm 可见/近红外波长线偏振光以及不同油种做了实验，实验结果与物理分析一致。

On the basis of previous work that oil spill polarized light detection methods, the polarization station of reflected light in in the Poincare Sphere is analyzed, and physical analysis of the detection methods is given. Using linearly polarized light as incident light, with the incidence angle near the Brewster angle, the trajectory of reflected light polarization state in the poincare sphere is used to identify different types of oil、 water、 oil film thickness. In further, experiments are condusted with 650, 850, 1064, 1310 and 1550 nm wavelengths linearly polarized light and different oil, and experimental results and physical analysis are well confirmed.