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作 者:李鑫权 张军强[1,3] 吴从均 马健[1,2] 卢天姣[1,2] 杨斌 LI Xin-quan;ZHANG Jun-qiang;WU Cong-jun;MA Jian;LU Tian-jiao;YANG Bin(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 101400,China;Yusense Information Technology and Equipment(Qingdao)Co.,Ltd.,Qingdao 260000,China)
机构地区:[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京101400 [3]长光禹辰信息技术与装备(青岛)有限公司,山东青岛260000
出 处:《光谱学与光谱分析》2024年第1期250-257,共8页Spectroscopy and Spectral Analysis
基 金:国家自然科学基金面上项目(61875192);中国科学院王宽诚教育基金会资助。
摘 要:为满足偏振光谱成像探测中对于大视场、宽谱段技术要求,设计了一种基于偏振强度调制技术(PSIM)的宽谱段大视场偏振光谱成像仪。针对前置望远镜组,文中对现有国内玻璃材料消色差分析,优选了可见至短波红外的复消色差玻璃,通过控制镜组中PSIM模块光线角度,实现大视场内在PSIM模块上的入射角度需求。结合分析结果,采用光学设计软件优化设计。设计结果表明,前置望远系统能够实现波段为400~1 700 nm,视场角为72°,焦距为20 mm, F数为4的高质量成像,全谱段内探测器截止频率处传递函数优于0.4, PSIM模块上最大入射角度为±4.99°,有效保证了各视场内偏振调制的一致性。后置光谱分光系统采用基于Offner结构的凸面光栅,优化结果显示各波段点列图均小于一个像元,在探测器奈奎斯特频率处中心波长的MTF达到0.6,各项指标均满足设计要求。本文对于基于PSIM宽谱段偏振光谱成像仪器的工程化具有很重要的现实意义,对宽谱段光学系统消色差设计也具有一定指导意义。According to the technical requirements of the large field of view and wide spectral band in polarization spectral imaging detection,a wide spectral band and large field of view polarization imaging spectrometer based on Polarimetric-spectral intensity modulation(PSIM)was designed.For the front telescope group,according to the achromatic analysis of existing domestic glass materials,the achromatic glass from visible to short-wave infrared is selected.By controlling the light angle of the PSIM module in the mirror group,the incident angle demand on the PSIM module in the large field of view is realized.Based on the results of the analysis,optical design software is used to optimize the design.The design results show that the front telescopic system can achieve high-quality imaging with a wavelength range of 400~1700 nm,a field angle of 72°,a focal length of 20 mm,and an F-number of 4.The transfer function of the detector at the cut-off frequency in the full spectrum is better than 0.4,and the maximum incidence angle on the PSIM module is±4.99°,effectively ensuring the consistency of polarization modulation in each field of view.The post-spectral spectroscopic system uses a convex grating based on the Offner structure.The optimization results show that the point array of each band is less than one pixel and the MTF of the central wavelength at the Nyquist frequency of the detector reaches 0.6,and all indicators meet the design requirements.This paper has important practical significance for the engineering of polarization spectral imaging instruments based on PSIM wide spectrum and also has certain guiding significance for the achromatic design of wide-spectrum optical systems.
关 键 词:偏振成像光谱仪 复消色差 PSIM 凸面光栅 光学设计
分 类 号:TP731[自动化与计算机技术—检测技术与自动化装置]
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