Transmission Characteristics Analysis And Study On Detection Method Of Circularly Polarized Light In Strongly Scattering Media

Polarization imaging, as a new photoelectric detection technology, has unique advantage in target detection, recognition and processing compared with traditional photoelectric detection technology. The full polarization detection technology which contains circularly polarized components has important significance for the study of active detection in the strong scattering medium (such as biological tissue solution, fog weather or underwater environment, etc.) and beam transmission characteristics in chiral materials. Based on the classical scattering theory, the helicity reversion mechanism of the circularly polarized light and the active detection method of the circular polarized light are studied for the helicity of circularly polarized light, and the main contents contains:(1) In view of the phenomenon that the helicity of circularly polarized light will flip in the process of scattering and transmission, the helicity reversion and maintenance mechanism of the circularly polarized light is illustrated from the perspectives of scattering medium properties and scattering angle, and the backscattering helicity reversion characteristic of circularly polarized light is analyzed by Monte Carlo simulation method and is verified by three kinds of simulation experiments.(2) Aiming at the problem that circular polarization V component of the atmosphere is too small, we analyze the conditions that circular polarization is produced by particle scattering and by the surface reflection of ideal smooth target. Then we carry out simulation experiment for polarization properties of different metal surface reflection, and analyze the influence of different wavelengths of incident light and polarization of the incident light on polarization characteristics of the metal surface reflection.(3) According to the difference of the polarization state of the incident light between particle scattering and target reflection, the thesis describes the polarization scattering properties of the medium and the polarization reflection characteristics of the metal surface by using Stokes-Mueller, and we build the model of the circularly polarized active detection process and verify the accuracy of the model by Lambert’s law. Finally, we design and implement three-dimensional dynamic visualization simulation system for active detection of circular polarization with VC and OpenGL.(4) Aiming at the problem of target recognition in the strong scattering medium, we analyze the feasibility of target detection that circularly polarized light transmit through the scattering medium using simulation system, and put forward two simulation methods of polarization imaging under different visibility conditions. By means of simulation method, we verify the principle that the helicity filtering of circularly polarized can enhance the target resolution, contrast and suppress backscattering light, which can implement the enhancement processing of polarization imaging in the strong scattering environment.