| Citation: | ZOU Hong-yang, ZHAN Jun-tong, LI Wen-jun, ZHANG Su, FU Qiang, DUAN Jin, LI Ying-chao, LIU Hong-yu. Study on visible polarization characteristics of airport ground material based on BPDF correction[J]. Chinese Optics. doi: 10.37188/CO.2024-0158
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In order to study the polarization characteristics of typical airport ground materials, this paper provides a theoretical model. This model is required for the development of polarization imaging instruments. Based on the P-G model, it first analyzes serious shadow masking effects. These effects occur when light is incident at a large angle. It then optimizes the shadow masking function using the spherical trigonometry formula. This optimization equates the specular reflection point to a three-dimensional sphere. Due to the unique dispersion characteristics of different targets, a new bidirectional polarization distribution function (BPDF) model is introduced. This model replaces the traditional BRDF parameter affected by wavelength and body scattering. The new BPDF model integrates diffuse reflection and body scattering. In the experimental stage, the accuracy of line polarization degree is calibrated. The line polarization degree of typical airport ground material is fitted with model parameters. This fitting is based on the dynamic TS algorithm through multi-angle BRDF experiments. The fitting model's six parameters are used to obtain the root mean square roughness parameter. This process verifies the validity of the modified BPDF model. In the simulation stage, the root mean square error (RMSE) is used as the accuracy index. The modified BPDF model, control model, and experimental results are compared. This comparison analyzes the effects of detection angle, azimuth angle, and incidence angle on polarization characteristics. The accuracies of four experimental targets improved by 4.39%, 4.00%, 4.17%, and 5.26%. This is compared with the control model. The root mean square error is less than 0.05 for large detection angles. This allows the modified model to study polarization characteristics of rough materials like airport ground targets. Finally, the effect of fitting parameters on polarization characteristics is simulated. Results show that line polarization is positively related to the refractive index. It is inversely related to surface roughness. The accuracy of the modified BPDF model is thus proved. This provides ideas for studying polarization characteristics of airport ground targets.
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