火星车避障相机光学设计

火星车避障相机设计不仅要在优化阶段尽可能减小残余像差,还必须考虑各类约束条件和制造公差。在考虑可制造性约束的情况下,采用4片分离的球面透镜,优化设计了F数15、物方视场角180°的避障相机。为了获得更优的像面照度一致性和成像质量,在初始结构基础上额外引入透镜,增加了系统优化自由度同时降低了像面上的光线入射角度。在光学系统优化时,将光学系统形态参数作为约束条件以推动停滞的优化过程,最终获得了接近衍射分辨极限的成像质量。在此基础上,分析了避障相机光学系统的制造公差。设计结果显示,相机的成像质量能够满足火星车探测和避障需求,其光学结构具有良好的可制造性。

Optical design of hazard avoidance camera for Mars rover

Design of avoidance camera for Mars rover not only needs to meet the demand of imaging quality but also to consider the manufacturability.An avoidance camera with F of 15 and field of view of 180° is designed with four separated spherical lens.To achieve the high imaging quality and uniformity of illumination,a new lens is added to increase the free degree of design and to decrease the angle of incidence in image surface.In the optimization process,lens form parameters are used for constraints to push the stagnation of optimization and image quality of the camera is close to the diffraction limitation.In addition,the tolerances of avoidance camera are analyzed.The result shows that the optical performance of the camera meets the demand of Mars detection and hazard avoidance and its optical structure is manufacturable.