Design Of Aerosol Detection Imaging System Based On Multi- Angle And Polarization

In recent years,smog pollution has become increasingly serious,and the demand for aerosol particles,the most important component of smog,is increasing.Multispectral,multi-angle and polarization methods are the most common means of aerosol detection.The multi-spectral and multi-angle approach is to obtain more information by increasing the detection spectrum and the detection angle.If the unique polarization information of the aerosol in different environments is added,it will greatly increase the amount of information and inversion accuracy of aerosol inversion.The main purpose of this paper is to design a multi-angle polarized aerosol detection space camera equipped on a standard 3U cubic satellite.Firstly,through the investigation of various instruments for aerosol detection at home and abroad,combined with the detection of the actual situation of smog pollution in Xi'an,the key parameters such as angle of view,focal length,resolution,size limit and observation spectrum required by the imaging system are determined.Then,the structure of the imaging system is selected,and the design of the transmissive anti-distance telescope system is determined.At the same time,in order to ensure the detection of the subsequent polarization state,the emitted light needs to be divided into three paths and perpendicular to the polarizing plate.The splitting is performed by a combination of three prisms and the imaging system must be telecentric beam path in image space.Then,the initial structure of the imaging system is determined by theoretical calculation,and then the lens is added and the CODEV optical design software is used to optimize the system and complete the image telecentricity of the system.Then the doublets is introduced to correct several basic aberrations,and an optical system with excellent imaging quality is obtained.Then,the placement method of the spectroscopic system was arranged,and the apex angle and size of the three spectroscopic prisms were calculated and added in the CODEV software to complete the optical design of the entire imaging system.Finally,the image quality is optimized,and after image quality analysis,temperature adaptability analysis,tolerance analysis,ghost image analysis and stray light analysis,the results show that this design meets system performance requirements and processing requirements.The multi-angle polarization imaging system of this design is the biggest difference from the current domestic and foreign instruments,which avoids the use of the filter-off wheel moving parts and the wedge compensation mechanism,and the structural complexity is greatly reduced,which is beneficial to speed up the development of the launch cycle,and The assembly accuracy is not high,and the resources such as size and power consumption are small,which is beneficial to the satellite.