摘要
针对空间碎片探测相机光学镜头的设计要求，提出了一种全新的紧凑型、小型化、轻量化、高像质、可全天候工作、使用环境恶劣的光学镜头，突破了以往该类系统结构复杂、体积大、重量重、仅有一个焦距的瓶颈。利用衍射光学元件特殊的特性进行消色差和消热差设计，并利用锗和硅混合来校正系统色球差，最终设计镜头的焦距为30，120mm，相对孔径为1／4。设计结果表明，在空间频率16lp／mm处，～40～60℃温度范围内，短焦距、长焦距的传递函数值分别优于0．45和0．55，接近衍射极限；短焦距、长焦距的最大RMS弥散斑直径分别为15．8，7．2μm，远小于探测器像元尺寸30μm，表明该系统在实际使用温度环境下具有良好的成像质量。
A new kind of optical lens with light weight, compact structure, good image quality, all-weather work, scurvi- ness environment is designed based on the triturating requirement of the space camera for debris. The lens breaks through the flaw that the conventional system always has complex structure, heavy weight, large volume, and only one focal. Diffractive opti- cal element is used to calibrate the chromatic aberration and temperature difference by its characteristics. Ge and Si are utilized to calibrate the spherochromatic aberration. The result indicates that when spatial frequency is 16 lp/mm, the MTFs are above 0.45 and 0.55 in short focal and long focal, respectively. The MTF is approaching to the diffraction limit. The maximal RMS diame- ters of spot diagram are 15.8 ~m and 7.2/~m in short focal and long focal, respectively, which are less than the diameter of detec- ting sensor. It shows that the image quality of the lens is very good, and it calibrates the temperature difference in real circum- stance of the application.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第10期2511-2516,共6页
High Power Laser and Particle Beams
关键词
空间相机
光学设计
交会对接
红外成像
space camera
optical design
rendezvous and docking
infrated imaging
