Experimental analysis of polarization properties of different material surfaces by multi-angle detection

Compared with intensity detection, the polarization detection can effectively enhance the accuracy of ground object target (such as camouflaged target) recognition. A polarization properties test system was designed and built to conduct the multi-angle polarization imaging experiments on five targets, namely iron plate, glass plate, green lacquer-coated iron plate, green lacquer-coated glass plate and turf. First, the incident light source was set to completely linearly polarized light by rotating the polarizer. Then, a filter was added in front of the polarized camera lens to obtain the images of five materials in the same central band at various detection zenith angles and detection azimuth angles. Finally, the polarization degree of the obtained polarization image was calculated. The results show that the polarization preserving properties of different materials are different, and the polarization degree of the object is only related to the surface coating of the material, and has nothing to do with the internal composition. In the direction of specular reflection, the target has the largest degree of polarization. This indicates that the polarized light detection can be used as a basis for material classification, which can be applied to remote sensing detection, material evidence search and other aspects, and has certain guiding significance for the production of special camouflage materials for anti-polarization reconnaissance.