星载均匀像面低畸变广角气溶胶探测仪的研制

为满足空间遥感的迫切需求,设计并研制了一个星载均匀像面低畸变广角气溶胶探测仪样机.该仪器通过利用光阑像差产生的有效像差渐晕提高像面照度的均匀性,解决了广角系统中像面照度不均匀的问题.合理选择结构型式校正了畸变,并且采用全球面光学系统,易于加工和检测.广角气溶胶探测仪的中心波长为670 nm,带宽20 nm,全视场72°,相对孔径1/3.6,焦距20 mm.实验结果表明:研制的星载广角气溶胶探测仪镜头其入瞳大小5.6 mm,边缘视场的相对照度达到95.6%,在36 lp/mm处,轴上视场的调制传递函数值大于0.61,轴外视场的调制传递函数值高于0.58,最大畸变量为-1.95%,完全满足设计指标要求,体积小,适合空间遥感应用.

Development of Spaceborne Wide-angle Aerosol Imager with Low-distortion and Uniform Image Surface

In order to meet the urgent requirements of space remote sensing, a spaceborne wide-angle aerosol imager prototype with low-distortion and uniform image surface is designed. The illuminance distribution on image plane is improved by using effective aberration vignetting resulted from stop aberration,and the problem of non-uniform illuminance on the image plane of wide-angle optical system. The distortion is corrected by choosing appropriate optical structure. The optical elements are all spherical face, so it is easy to fabricate and test. The central wavelength is 670 nm, wavelength band is 20 nm, and full field of view is 72°,the relative aperture is 1∶3.6, and the focal length is 20 mm. Experiments show that the entrance pupil size is 5.6 mm, the relative illuminance of edge field of view is 95.6%, the MTF of on-axis FOV is more than 0.61@36 lp/mm, the MTF of off-axis FOV is more than 0.58@36 lp/mm, and the maximum distortion is -1.95%,, which satisfies the pre-designed requirement. Its structure is compact, and feasible for applying in space remote sensing.