中国光学（中英文）2023，Vol.16Issue(6)：1450-1462,13.DOI:10.37188/CO.2023-0062
轻小型全铝高分相机
All-aluminum high-resolution camera with lightweight and compact size
摘要
Abstract
In order to meet the urgent need of developing lightweight and compact space cameras quickly,ef-fectively,and rapidly,a detailed comparative analysis is conducted,including optical system forms and ima-ging systems.The optical system form of RC+compensation group is determined,and the imaging system of small F#+micropixel is adopted.Compared with the detailed parameters of the DOVE camera,a lightweight all-aluminum high-resolution camera with a resolution of 3.48 m at an orbital altitude of 500 km is designed.The overall design results of the camera,its optical and optomechanical structures,imaging electronics,and thermal control are described in detail.The optical design results of the RC+compensation group of F5.6 are obtained.Using RSA-6061 microcrystalline aluminum alloy as the structural material of the mirror,coupled with an integrated high-rigidity hard aluminum alloy structure,the static(gravity and temperature deforma-tion)simulation analysis results meet the optical design tolerance requirements.The dynamic simulation ana-lysis results show that the first order mode is 302.92 Hz,which has a sufficiently high dynamic stiffness and safety redundancy.The imaging electronics using a 3.2 μm large area array 9 K×7 K detector is designed for low noise miniaturization.Thermal control is provided by the satellite platform at a temperature level of 20 ℃±4 ℃ for the camera.Integration test results show that:(1)The RMS wave aberration of the central field of view is λ/15.6,and the wavefront aberration of the five fields of view is better than λ/12.3,which en-sure high-quality imaging near the diffraction limit of the camera.The measured optical transfer function at Nyquist frequency is 0.217;(2)The maximum sinusoidal vibration of the camera in three directions is ampli-fied 1.17 times,and the first-order mode of the camera is 295 Hz,with a deviation of 2.61％from the simula-tion result.The structural stiffness is high and the mechanical stability is good.Under vacuum environment of 10-4 Pa and three different temperatures of 16 ℃,20 ℃ and 24 ℃,the image is clear and can distinguish the corresponding resolution plate image at Nyquist frequency;(3)The image of 2 km outfield target is good,as well as clear and distinct grayscale image with sharp shadow boundaries.The all-aluminum high-resolu-tion camera is achieved 3.48 m resolution at a track height of 500 km,width of 15 km×15 km and a total weight of 2 kg.The structural rigidity and strength test results meet the requirements of space launch scenari-os,and these can provide theoretical guidance and engineering reference for the design of lightweight and higher-resolution space cameras.关键词
轻小型/高刚性/动态刚度/低噪声Key words
lightweight and compact size/high rigidity/dynamic stiffness/low noise引用本文复制引用
孙景旭,谢虹波,李淑贤,谢新旺,王硕,周峰..轻小型全铝高分相机[J].中国光学（中英文）,2023,16(6):1450-1462,13.基金项目
广东省重点领域研发计划资助项目(No.2018B030328001)Supported by Projects funded by the R & D plan in key areas of Guangdong Province(No.2018B030328001) （No.2018B030328001）
