Rough Surface To The Depolarization Characteristics Of The Scattered Light

The laser backscattering polarization characteristics of rough surfaces have made great progress in recent years and wide applications of their fruits in remote sensing, target recognition, biomedicine and other fields, play an important role in areas of military affairs and science.The theoretical research and experimental study of depolarization characteristics of rough surfaces are displayed respectively in this paper. The depolarization expressions of Gaussian surfaces are derived to calculate the degree of depolarization when incident light is P light or S light by like and cross-polarized backscattering coefficients. The depolarization curves are obtained by numerical simulation and compared when incident factors are different including P light and S light incidents metal targets respectively, P light incidents metal and non-mental targets and P light with different wavelength incidents metal and non-mental targets. It is found that the degree of depolarization increases with the incident angle increasing and has the decreasing trend when incident when it achieves maximum. The depolarization effects of non-metal targets are much stronger than mental targets when other incident factors are same. The depolarization capability of target to shorter wavelength is stronger when incident wavelengths are different.The depolarization curves are experimented in this paper when incident wavelength is 1064nm and 632.8nm with polarized direction vertical, parallel and 45°. It is found that experimental curves are same with theoretical curves. The factors which may affect polarization characteristics of scattering light are investigated, including roughness of targets, polarized direction of incident light, wavelength, materials and so on. The rules obtained from experimental results are same as conclusions from numerical simulation. Qualitative explanations are given in this paper. The relevant incident angles of maximum in curves are also investigated. It is found that incident angles of maximum are increases with roughness of targets increasing.