摘要
为了满足航天器对轻小、价廉,性能可靠的自主导航系统的要求,设计了广角静态红外地平仪系统。该系统选择辐射稳定的14～16.25μm作为工作波段,并设定全视场角为136°,F数为0.61;采用反远距结构,使系统后工作距达到15mm;利用f-θ镜头设计原理,并合理地选用非球面对广角系统进行优化设计,使系统的线性特性的相对误差<0.5%;在空间频率为15lp/mm处,系统的调制传递函数>0.6,接近衍射极限;在半径为20μm的圆内,系统径向能量>85%。另外,采用了像方远心光路,提高了像面的照度均匀性,实现了整个像面照度均匀性>99%。设计结果表明,该镜头结构简单、体积小、后工作距大,很好地解决了广角镜头轴外像差平衡问题,实现了地平仪系统的高精度设计。
In order to meet the requirements of spacecrafts for autonomous navigation systems with light small,cheap and reliable performance,a wide-angle static infrared horizontal system was designed.The system chose the operating wavelength range of 14 to 16.25 μm to keep a stable radiation,and its full field of view was set as 136° and F number as 0.61.By using a retrofocus structure in image space,the back working distance has been 15 mm in the optical system.On the basis of the design principle of a f-θ lens,the aspheric surface was used to rationally optimize the wide-angle system,then the related error of linear characteristics of the f-θ len is less than 0.5%,and the modulated transfer function is higher than 0.6 at 15 lp/mm in the image plane（approaches diffraction limit）.In a circle with radius of 20 μm,the radial energy is higher than 85%.Furthermore,a telecentric optical path was used in the system,which improves the relative illumination to more than 99%.These results show that the designed lens has the advantages of simplicity,compactness and long back working distance,and can balance the correctness of off-axis aberrations.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2010年第6期1243-1248,共6页
Optics and Precision Engineering
基金
国家863高技术研究发展计划资助项目(No.2007AA122110)
国家自然科学基金资助项目(No.60507003)
国家自然科学基金资助项目(No.60977001)
吉林省科技发展计划杰出青年资助项目
关键词
红外地平仪
反远距结构
广角f-θ镜头
光学设计
infrared earth sensor
retrofocus structure
wide-angle f-θ lens
optical design
