星载多角度偏振成像仪是一种超广角画幅式低畸变成像的偏振传感器.介绍了多角度偏振成像仪的基本工作原理,从保证偏振测量精度和大视场成像质量要求出发,分析了光学系统的设计难点及光学系统的结构型式,最终采用了反远距型像方远心光路结构.根据光路结构的像差特点,采用非球面镜校正畸变及像散,改善像面照度的均匀性,依据这样的思路,运用光学设计软件对多角度偏振成像仪的光学系统进行了光线追迹和优化,其工作光谱范围为420~930 nm,全视场角为118.74°,焦距为4.833 mm,相对孔径为1:4,并对设计系统进行了像质评价,结果表明,光学系统的传递函数在全视场大于0.5@22.22 lp/mm,最大畸变为0.9669％,像面相对照度均匀性高于97%,经过光学系统的加工制造装调,成像质量满足实际任务要求.

Spaceborne directional polarization camera is a super-wide-angle polarization and low-distortion imaging sensor.First,the working principle of the spaceborne directional polarization camera has been introduced.In order to guarantee the requirements of polarization measurement accuracy and the wide field of view imaging quality,the design difficulties of the optical system have been analyzed and finally a retro- type image side telecentric optical structure has been adopted.Due to the aberration characteristics of the optical path structure,aspheric lens has been used to correct distortion and astigmatism which improves the uniformity of the image plane illuminance.Depending on this method,ray tracing and optimization for spaceborne directional polarization camera has been used by the optical design software.The spectral range is 420~930 nm.The whole field of view angle is 118.74°.The focal length is 4.833 mm.The relative aperture is 1:4.The result shows that the modulation transfer function (MTF) of the optical system in the whole field of view is greater than 0.5@22.22 lp/mm,the maximum distortion is 0.9669% and the degree of surface unevenness of image is higher than 97%.After mounting,aligning and fabricating,the image quality of optical system completely satisfies the requirements.