低成本小型化遥感光学系统设计

Design of remote sensing optical system with low cost and miniaturization

随着航空航天成像技术的发展,遥感成像观测系统需求不断增加,为了简化光学系统的加工装配复杂度,缩小光学系统体积,该文提出了一种低成本、小型化遥感成像光学系统设计方法。在全球面镜的基础上,配合氟化钙等低色散材料,设计了一种焦距2000 mm,适用于5.08 cm(2 inch)探测器的光学成像系统,该系统在50 lp/mm处MTF(调制传递函数)优于0.41,体积与R-C系统接近,系统的球面主、次镜避免了在加工装调时使用非球面补偿器,降低了加工装调成本。同时设计了新型百叶窗遮光罩结构,有效避免了传统外遮光罩结构形式体积过大的问题,规避角大于12°后PST(点源透射比)值均小于10^(-6),且光学体积仅为ф227×421 mm^(3),远小于传统外遮光罩形式。该系统具有低成本、结构小型化、轻量化、像质优良、杂散光抑制良好等优点,在工程应用中可以满足航空航天成像系统的使用要求。

With the development of aerospace imaging technology,the demand for remote sensing imaging observation system is increasing.In order to simplify the alignment and assembly complexity of the optical system and reduce the volume of the optical system,a designed method for low-cost and miniaturized remote sensing imaging optical system was proposed.On the basis of all spherical lenses and low dispersion materials such as calcium fluoride,an optical imaging system with a focal length of 2000 mm and suitable for 5.08 cm(2 inch)detectors was designed.The modulation transfer function(MTF)was greater than 0.41 at 50 lp/mm,and the volume was close to the R-C system.The spherical primary and secondary mirrors of the system avoided the use of aspheric compensators during alignment and adjustment,which reducing the cost.The structure of a new type of louver baffle was designed to effectively avoids the problem of excessive volume of the conventional outer baffle structure.After the avoidance angle is greater than 12°,the point source transmittance(PST)value is less than 10^(-6),and the optical volume is onlyϕ227×421 mm^(3),much smaller than the conventional outer baffle form.The system offers advantages of low cost,miniaturized structure,light weight,excellent image quality,and good stray light suppression,which can meet the requirements of aerospace imaging system in engineering applications.