摘要
工业排放增多导致水体环境恶化,海洋生物濒危。传统的水体监测技术已无法满足实时、快速、准确的应用需求,为对水体环境实行更有效的监测,各研究单位开始利用遥感技术获取水体信息。针对水体监测的技术要求,设计了一种焦距为84.5mm,口径20mm,视场36°×6°的离轴三反式光学系统,可以满足空间遥感宽光谱覆盖的要求。系统主镜、三镜采用六次非球面,次镜采用二次曲面。经公差分析后,具备实际可加工性,在奈奎斯特频率处(71lp/mm)处各视场的调制传递函数(MTF)值均大于0.6,接近衍射极限,成像质量良好。该光学系统有望对监测水体污染具有一定参考意义。文章以主镜为例设计Offner补偿器生成非球面波对非球面镜进行零位补偿检测。
The increased industrial emissions have worsened the water environment and resulted in the endangerment of marine life.Traditional water body monitoring technology was unable to meet the real-time,fast and accurate application requirements.In order to implement more effective monitoring of the water body environment,various research units have begun to use remote sensing technology to obtain water body information.Aiming at the technical requirements of water monitoring,an off-axis three-reflection optical system is designed with a focal length of 84.5 mm,a diameter of 20 mm,and a field of view of 36°×6°.The reflective system can meet the requirements for wide spectrum coverage of space remote sensing.The primary and third mirrors of the system adopt sixth aspheric surfaces,and secondary mirror adopts quadric surfaces and the Offner compensator,which takes the primary mirror as an reference,is designed to generate aspheric waves to perform zero compensation test on the aspheric mirror.After tolerance analysis,it has good machinability and the modulation transfer function(MTF)values of each field of view at the Nyquist frequency(71 lp/mm)are all over 0.6,which is close to the diffraction limit,and shows good imaging quality.This optical system is expected to have certain reference significance for monitoring water pollution.
作者
刘宇轩
张冬冬
钮新华
LIU Yuxuan;ZHANG Dongdong;NIU Xinhua(Shanghai Institute of Technical Physics,Chinese Academy of Sciences,University of Chinese Academy of Sciences,Shanghai 200083,China)
出处
《光学技术》
CAS
CSCD
北大核心
2022年第2期139-143,共5页
Optical Technique
关键词
离轴三反
Offner补偿
空间遥感技术
光学系统设计
off-axis three mirrors
Offner compensator
space remote sensing technology
optical system design
