Polarization active imaging

摘要: The purpose of active imaging system is to provide discrimination at long ranges independently from the surrounding illumination by using and controlling its own light source. Parameters such as Doppler shift for coherent devices, range, or intensity back scattered objects have already been used encode images. However, another parameter characterizing electromagnetic field can help discriminate target: polarization. In this paper we demonstrate that images resulting analysis polarization offer better contrasts than classical encoded back-scattered. emitting part polarimeter built CREOL (Polarization State Generator) a doubled YAG pulsed laser with external controllers. At receiving part, Polarization Analyzer separates incoming so two crossed polarized target.These are acquired simultaneously high-resolution progressive scan digital cameras controlled computer. Afterwards, computer processes data displays new parameters (depolarization ratio example). several examples experiments, influence geometry target (roughness, shape) on incident state will be discussed.