| Multi-angle Polarimetric Spectral Imaging technology(MPSI) is a new type of optical detection technology which integrates imaging technology, spectroscopy technology, polarization technology and viewing angle. MPSI improves people’s perception of the target information greatly, enhances the remote sensing data information, broadens the range of data applications, and has broad application prospects in many areas of soldiers and civilians, which has become a hot topic of polarization and spectral detection field which is widely used in areas such as astronomy, atmospheric sounding, biomedical diagnostics, monitoring the Earth’s environment, and target detection and identification.Currently, domestic and foreign scholars have carried out extensive research for the single field of wide field remote sensing, multi-angle remote sensing, multispectral remote sensing and polarization measurements of static, but the research of significantly wide, multi-tools, and synchronous polarization measurement method has not been explored enough. Meanwhile, with the increasing demand in related fields, new methods and correlated instruments very important, it is necessary to study new technology of multi-polarization spectral imaging and promote the fundamental research and technological development, to achieve wide coverage, multi-spectral, multi- angle, high-precision polarization measurement methods and new instrument design. On this basis, the mechanism of the static spectropolarimeter imaging, error analysis and high-precision alignment, optical system design of imaging instrument are carried out a detailed analysis and presentation in this paper.Firstly, based on the requirement for high-precision polarization measurement data that are needed in the areas such as atmospheric detection, target detection and recognition, the research progress of related technologies is surveyed. The survey analyzes the advantages and disadvantages of different spectropolarimeter imaging instruments, and summarizes the application of imaging spectropolarimeter in different areas. At the end of the chapter the source of research subject and the main contents of the paper are introduced followed.Secondly, the basic theory and related technologies of static imaging spectropolarimetric method based on intensity modulation techniques were studied. The spectral imaging technology and polarization imaging technology were introduced including the operational principle of typical dispersive spectrometer works and related equipment index parameters, as well as several main ways of polarization imaging.Next, amathematical model of intensity modulation process of static imaging spectropolarimeter is established, and a detailed analysis of the mechanism of intensity modulation is provided. The in-depth analysis and optimization of the key technologies in the imaging process is made. For the rotation angle of the polarization spectrum modulator error between the polarizing element, error analysis are made. The simulated demonstrations of system alignment and spectral-polarimetric imaging are also presented. The results show that the method is sensitive to the relative rotation angle errors between the polarization devices, which has the ability to ensure the full utilization of spectral channels bandwidth and to realize the precise alignment of the spectral-polarimetric modulator with the accuracy up to 0.2°. Thus the method can ensure the recovery of the spectrum precision. The optical experiment system is built and the experiment of the intensity modulation is made.Finally, the observation angle of polarization, spectral range, spectral resolution, width, spatial resolution, polarization measurement accuracy and other technical indicators of the spectral imaging instruments are demonstrated. To the need of these targets, the overall design of the imaging instrument program is made. Considering the need of spectropolarimetry the suitable instrument optics system is selected and designed, and the corresponding imageevaluation islisted. |
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