Research On Multidimensional Reflection Characteristics Of Sea Surface Targets Of Spilled Oil

In recent years,marine oil spills around China have occurred from time to time,which has seriously endangered the ecological environment of China’s oceans.Accurate identification of oil spill types is the basis for rapid handling and correct traceability of oil spill accidents.However,due to the unpredictable marine environment,there are often various problems when using traditional marine photoelectric detection technology to monitor oil spills,such as high false alarm rate,poor real-time performance,and low identification ability,which are difficult to meet the urgent need for accurate detection and identification of oil spills on the ocean surface.Starting from the polarization detection technology of marine oil spills,this paper has carried out the modeling of polarized bidirectional reflection distribution function(p BRDF)of offshore oil spill targets,and the experiments and simulation analysis of visible light polarization characteristics of oil spill materials.Firstly,based on the sea surface micro panel theory,a more comprehensive visible light PBRDF model for oil spills under sea surface conditions was constructed by comprehensively considering specular reflection,diffuse reflection,and volume scattering.An experimental test of visible light polarization on the surface of an oil spill target was conducted,and the experimental data were inverted using the least square method to obtain multi-parameter values such as the refractive index of the oil spill material.Then,the polarization characteristics of the oil spill are obtained by simulation,and the variation rules of the polarization degree with the parameters such as the incoming zenith angle,the observed zenith angle,the relative azimuth angle,the wind direction,and the wind speed are obtained.Finally,the accuracy of the model is verified.The experimental results show that variables such as incident zenith angle,observed zenith angle,relative azimuth angle,wavelength,wind direction,and wind speed all affect the degree of polarization of oil spills.In the visible light range,the degree of polarization increases slightly with the increase of wavelength,but the change is not significant.The incidence zenith angle,observation zenith angle,and relative azimuth angle have a significant impact on the degree of polarization.Wind speed mainly affects the peak value of oil spill polarization,and with the increase of wind speed,the peak value of oil spill polarization gradually decreases.As the wind direction increases,the peak value of oil spill presents a trend of first increasing,then decreasing,then increasing,and then decreasing.Specifically,the peak value reaches its maximum when the relative azimuth angles of the wind direction are 45 ° and 135 °,and the distribution of oil spill polarization degree when the wind direction is 180 ° to 360 ° is consistent with the distribution law of oil spill polarization degree when the wind direction is 0 ° to 180 °.In terms of the polarization characteristics of different oil spill targets,although the degree of polarization varies slightly in numerical value,the variation trend of different oil spills is basically consistent,and is greatly affected by the incident zenith angle,observation zenith angle,and relative azimuth angle.Therefore,in practical exploration,it is important to consider the issue of detection angle.The accuracy of the model established in this paper has reached over 80% after experimental verification,confirming the accuracy of the model,providing a new way to study the polarization characteristics of oil spills on rough seas.