摘要
根据静止轨道特点,分析设计覆盖近紫外至长波红外波段的成像光谱仪光学系统,将0.3~12.5μm的光学全谱段细分为5个子谱段并集成于光学系统,每个子谱段均采用4个分光系统在视场内拼接实现宽幅所需的超长狭缝,狭缝总长最长达241.3 mm,通过内扫描实现400 km×400 km地面覆盖。重点研究满足拼接要求的紧凑型长狭缝分光系统,指出其实现高保真分光成像需满足低畸变、低杂散、高信噪比、均匀光谱响应等条件。据此,设计基于凸面闪耀光栅的Offner型和Wynne-Offner型高保真分光系统,并研制各个子谱段的原理样机。给出全谱段长狭缝和凸面闪耀光栅两种核心元件的研制结果,单条狭缝最长达61.44 mm,5个谱段的光栅槽密度范围为8.8~312.1 lp/mm,峰值效率均在70%以上,最高达86.4%。以可见近红外和长波红外两个谱段为例,给出分光系统装调和测试过程,结果表明所研制的分光系统具有高保真性能,各项指标均满足要求。
Objective It is necessary to develop full-spectrum hyperspectral remote sensing technology from geostationary orbit to fully meet the application requirements of continuous monitoring as well as fine identification and classification in the fields of disaster prevention and mitigation,environment,agriculture,forestry,ocean,meteorology,and resources.In view of the increasing demand for efficient and accurate spatial and spectral information acquisition,imaging spectrometers are driven to develop in the direction of faster response,larger width,higher resolution,and higher signal-to-noise ratio(SNR).Since the satellite in a geostationary orbit has the unique advantage of keeping relatively stationary with the ground,it has high timeliness and continuous observation capability and can obtain information from ground scenes quickly and widely.However,at present,most of the spectral remote sensing payloads serving on the geostationary orbit are multispectral payloads.They have only a dozen of spectral channels in the full spectrum,which is not sufficient to obtain fingerprint information of ground scenes,and their ability to identify types and components of substances is far inferior to that of hyperspectral payloads.The fusion with hyperspectral data in the full spectrum can greatly improve the recognition accuracy and can provide more descriptions of targets.However,due to the great difficulty and high cost of such payloads,there is little related research reported at present.In this paper,we present an optical system of the geostationary fullspectrum wide-swatch high-fidelity imaging spectrometer(GeoFWHIS).The prototypes of the spectrometers are developed to verify the correctness and feasibility of the design.Methods According to the characteristics of the geostationary orbit,the imaging spectrometer covering near-ultraviolet to long-wave infrared(LWIR)is analyzed and designed.The full spectrum from 0.3μm to 12.5μm is divided into five sub-spectral bands and integrated into the optical system.Each sub-spectral ba
作者
朱嘉诚
赵知诚
刘全
陈新华
李欢
唐绍凡
沈为民
Zhu Jiacheng;Zhao Zhicheng;Liu Quan;Chen Xinhua;Li Huan;Tang Shaofan;Shen Weimin(School of Optoelectronic Science and Engineering,Soochow University,Suzhou 215006,Jiangsu,China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University,Suzhou 215006,Jiangsu,China;Beijing Institute of Space Mechanics and Electricity,Beijing 100094,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第8期296-312,共17页
Acta Optica Sinica
基金
国家重点研发计划(2021YFD2000101,2016YFB0500501)
国家自然科学基金(62105230)
中国博士后科学基(2020M681700)。
关键词
光学设计
成像光谱仪
全谱段
高保真
静止轨道
凸面闪耀光栅
optical design
imaging spectrometer
full-spectrum
high-fidelity
geostationary orbit
convex-blazed grating
