Research On Snapshot Polarimetric Spectral Imaging Technology Based On Microlens Array

In recent years,with the increasing application requirements in the fields of natural environment monitoring,space resource exploration,medical disease diagnosis,military target detection,etc.,people's requirements for target recognition capabilities and information acquisition accuracy have become higher and higher.At the same time,promoted by the continuous development of optoelectronic technology,computer technology and other related technologies,various detection technologies have sprung up.Polarimetric spectral imaging technology combines imaging technology,spectroscopy technology and polarization technology,increases the dimension of information acquisition,can analyze and process target information from multiple angles,and improve the ability to detect the physical and chemical characteristics of the target.This feature makes it stand out in many detection technologies.The current common polarimetric spectral imaging technology is facing the problems of slow information acquisition,few spectral channels,and unable to detect the full Stokes parameters,which gradually can not meet the needs of people.In this paper,a snapshot polarimetric spectral imaging system based on microlens array is proposed.The image data used to reconstruct the spectropolarimetric hypercube can be obtained at the camera exposure time,and the full Stokes parameters detection can be realized with multiple channels in the visible light band.This research mainly focuses on the following aspects:1.The composition and working principle of the snapshot polarimetric spectral imaging system based on microlens array are analyzed and researched through the Stokes parameter and the Muller matrix,mainly involving the channeled spectropolarimetry and the snapshot interference imaging spectroscopy.2.Comprehensively consider the performance index of the system,conduct research on industrial cameras and microlens arrays,complete the selection,and use ZEMAX simulation analysis according to the parameters of industrial cameras and microlens arrays to propose a hardware system design plan,including: front optical system design,double Nomarski prism design and polarimetric spectral intensity modulation module design.And customize the mechanical structure to combine the above parts to achieve prototype integration.3.Developed a snapshot polarimetric spectral processing software matching the hardware system,which realized the functions of real-time image acquisition,exposure parameter adjustment,spectral curve display and polarization slice display,etc.Besides,the user interface was designed to meet the principles of reasonable layout,intuitive operation and clear function,so that users can operate the software conveniently and effectively to complete various tasks.4.A complete experimental process is designed to systematically evaluate the performance of the prototype.After calibration and correction of the wavelength axis,the spectral recovery performance of the system is verified by laser and standard Color Checker,and then the polarization reconstruction ability of the system is qualitatively analyzed by polarizer plate and quantitatively analyzed by the combination of linear polarizer and achromatic quarter-wave plate.