基于Q型非球面的全景环带红外光学系统设计  

Design of a Panoramic Band Infrared Optical System Based on Q-Type Aspherical Surface

作　　者：刘一帆 周峰[2] 胡斌[1] 晋利兵 LIU Yifan;ZHOU Feng;HU Bin;JIN Libing(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]北京邮电大学,北京100876

出　　处：《航天返回与遥感》2024年第1期90-98,共9页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金(1210030377)。

摘　　要：全景环带光学系统凭借周视范围实时成像的特点已在超大视场光学领域中得到了广泛应用。传统的全景环带光学系统将折射、反射面集成在一片块状透镜中,光线在其内部进行多次折、反射导致头部单元体积较大,同时红外透镜材料密度大、折射率温度稳定性差等特点也与光学遥感器轻量化、可靠性高的应用需求相矛盾。文章基于像差理论,讨论了全景环带两反射镜红外光学系统头部单元初始结构设计方法,将Q型(Q-Type多项式)非球面引入全景头部单元增加优化变量,用偏离因子因子k_(RMS)数值表征非球面加工难度,设计了以两反射镜为头部单元的全景环带红外光学系统。该系统在奈奎斯特频率(20线对/mm)处调制传递函数优于0.5;全视场像元(25μm×25μm区域内)能量集中度优于65%,像质评价结果表明其成像品质良好。该设计在缩小系统体积、提高光学设计优化效率方面有很大的改进,满足超大视场实时成像的应用需求。The panoramic band optical system has been widely used in the field of ultra-large field of view optics due to the characteristics of real-time imaging around the view range.For the traditional panoramic ring optical system integrating the refraction and reflection surfaces in a block lens,the light is repeatedly folded and reflected inside the lens to limit the size reduction of the head unit.Moreover,the infrared lens material has high density,low transmittance,and poor refractive index temperature stability,which is contradictory to the needs of high stability and lightweight optical remote sensors.Based on the aberration theory,the initial structure design method of the head unit of the infrared optical system with a panoramic ring and two mirrors is discussed in this paper.Q-Type aspherical surface was introduced into the panoramic head unit to increase the optimization variables.A panoramic band infrared optical system with two mirrors as the head unit is designed to describe the difficulty in aspherical surface processing.The modulation transfer function of the system is better than 0.5 at Nyquist frequency(20 lp/mm).The energy concentration of full-field pixels(within 25μm×25μm)is better than 65%,and the image quality evaluation results show that the image quality is good.This design has great improvement in reducing the size of the system and improving the efficiency of optical design optimization and meets the application requirements of real-time imaging with large field of view.

关 键 词：全景环带光学系统 超大视场 Q型非球面 光学遥感器 

分 类 号：O439[机械工程—光学工程]