Fig. 1. Relationship between incidence angle， refractive index and polarization of reflected light.

Fig. 2. The relationship between the parameters of the sample reflection space

Fig. 3. Distribution of reflection polarization degree of oil spill at different spatial positions

Fig. 4. Polarization of different azimuth angles and observation zenith angles when the sun zenith angle is 55°

Fig. 5. Experimental process

Fig. 6. Experimental device

Fig. 7. Polarization images with different observation angles

Fig. 8. Polarization degree of fuel oil， crude， gasoline， diesel oil at different azimuth angles and different observation angles

Fig. 9. Visible light polarization degree of four oil spills at azimuth angles of 120°~240°

Fig. 10. Visible light polarization contrast of fuel oil， crude oil and gasoline relative to diesel oil at 120°~240° azimuth