摘要
为了提高变焦光学系统在复杂环境下的高分辨率探测能力,解决现有多波段光学系统中光路转换和波段切换耗时长、系统反应慢、不同波段目标信息存在差异的问题,设计了一种可见光(0.38~0.76μm)、中红外(3~5μm)共口径连续共变焦光学系统,系统工作焦距为7.52~98.35mm,变焦比为13×.基于正组补偿变焦理论分析了任意变焦位置处可见光、中红外变焦比的差异及其变化规律,推导了三片薄透镜消色差理论和双波段焦距补偿表达式.对变倍组和补偿组的光焦度进行合理匹配,使系统在任意变焦位置处的焦距及变焦比都相同,提高了双波段目标信息的一致性.根据使用要求,采用光学被动式完成双波段光学系统在-40^+60℃温度范围内的消热差设计.设计结果表明,系统结构紧凑,反应速度快,整体成像质量良好,可实现昼夜全天候工作.
In order to increase the high resolution detection capabilities of zoom optical system in a complex environment,and to solve the problems of the slow conversion speed of the optical path and differences among the object information of different bands in the multi-band optical system,a visible（0.38～0.76μm）and middle infrared（3～5μm）continuous co-caliber common zoom optical system with working focal length of 7.52～98.35 mm and zoom ratio of 13×was designed.The zoom ratio variation of visible and middle infrared at any zoom position was analyzed based on the positive compensation zoom group theory.The three thin achromatic lens focal length compensation theory and dual-band expression were derived.The power of zoom group and compensation group were matched rationally,making the system have the same zoom ratio at any zoom position and focal length,which improved consistency of dual-band target information.According to requirements,the dual-band athermal optical system with the temperature of-40～ ＋60℃ was designed with the use of optical passive.The results show that the system has compact structure,fast response and good overall image quality,which can achieve allweather day and night work.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2016年第10期46-55,共10页
Acta Photonica Sinica
基金
陕西省自然科学基金(No.2012JM8008)资助~~
关键词
光学设计
双波段
大变倍比
连续共变焦
消热差
Optical design
Dual-band
High zoom ratio
Continuous co-focal
Athermalization
