摘要
在天问二号探测任务中,为了获取高速运动目标的整体形貌和光谱信息,搭载了一台基于旋转衍射机理的面阵式光谱相机.相机利用衍射光学元件对入射光的相位进行编码,使得成像系统不同波长的点扩散函数呈现出形状相似,角度旋转的特征.这些具有波长依赖性的点扩散函数作为成像系统的光谱先验信息,让从编码图像中重建光谱数据成为可能.本文重点介绍折衍射混合光学系统的设计和成像系统的定标工作,定标获得的点扩散函数与理论设计的点扩散函数具有很好的一致性,证明定标过程以及图像数据预处理过程准确有效.
In the Tianwen-2 exploration mission,a spectral camera based on the diffracted rotation is deployed to capture the overall morphology and spectral information of the detected target at the moment of encounter with asteroids and other celestial bodies.The camera utilizes a diffractive optical element to encode the phase of incident light,resulting in point spread functions(PSFs)of different wavelengths exhibiting a similar shape while the PSFs rotates as the wavelength changes.These wavelength-dependent PSFs,acting as spectral priors for the imaging system,facilitate the reconstruction of spectral data from encoded images.This paper focuses on the design of the refractive-diffractive hybrid optical system and the calibration of the imaging system.The calibrated PSFs show strong consistency with the theoretically designed PSFs,confirming the accuracy and effectiveness of the calibration process and image data preprocessing.
作者
诸葛政跃
蒋婷婷
边美娟
徐豪
徐南
李奇
徐之海
ZHUGE Zhengyue;JIANG Tingting;BIAN Meijuan;XU Hao;XU Nan;LI Qi;XU Zhihai(College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《中国科学:物理学、力学、天文学》
北大核心
2025年第7期85-95,共11页
Scientia Sinica Physica,Mechanica & Astronomica
基金
天问二号搭载高光谱相机批复(编号:科工月[2023]21号)
宁波市重点研发计划项目(编号:2023Z053)
杭州城西科创大走廊创新发展专项(编号:511308-X02402)资助。
关键词
光谱成像
天问二号
快照式
衍射光学元件
图像重建
spectral imaging
Tianwen-2
snapshot
diffractive optical element
image reconstruction
