超光谱分辨率紫外双通道共光路成像光谱仪设计

张璐; 李博; 李寒霜; 顾国超; 王晓旭; 邵英秋; 林冠宇; 叶新

doi:10.37188/CO.2022-0125

超光谱分辨率紫外双通道共光路成像光谱仪设计

doi: 10.37188/CO.2022-0125

张璐^{1, 2,},
李博^1, ,,
李寒霜¹,
顾国超¹,
王晓旭¹,
邵英秋¹,
林冠宇^{1, 3},
叶新^{1, 3}

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 100049
3.
许健民气象卫星创新中心, 北京100081

基金项目: 黑土地保护与利用科技创新工程专项资助（No. XDA28050102）；国家自然科学基金项目（No. 62005268）；国家重点研发计划项目资助（No. 2018YFB0504600，No. 2018YFB0504603）；中国电波传播研究所稳定支持科研经费资助项目（No. A132001W03）

详细信息

作者简介:
张　璐（1997—），女，吉林长春人，硕士，2020年于长春理工大学获得学士学位，主要从事光学设计方面的研究。E-mail：1499201809@qq.com

李　博（1981—），男，吉林梨树人，博士，副研究员， 2011 年于中国科学院大学获得博士学位，主要从事高光谱遥感总体设计方面的研究。E-mail：libo0008429@163.com

中图分类号: TH744.1
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出版历程
- 收稿日期: 2022-06-14
- 修回日期: 2022-07-07
- 网络出版日期: 2022-08-03

Hyperspectral resolution ultraviolet dual channel common optical path imaging spectrometer

ZHANG Lu^{1, 2
,},
LI Bo^{1
, ,},
LI Han-shuang¹,
GU Guo-chao¹,
WANG Xiao-xu¹,
SHAO Ying-qiu¹,
LIN Guan-yu^{1, 3},
YE Xin^{1, 3}

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Innovation Center for FengYun Meteorological Satellite, Beijing 100081, China

Funds: Supported by Special project of black land protection and utilization science and technology innovation project (No. XDA28050102); National Natural Science Foundation of China (No. 62005268); National Key R&D Program of China undergrant (No. 2018YFB0504600, No. 2018YFB0504603); Stable-Support Scientific Project of China Research Institute of Radiowave Propagation (No. A132001W03)

More Information

Corresponding author: libo0008429@163.com

摘要

摘要:
针对超光谱分辨率成像光谱仪多通道探测需求，本文设计了一种超光谱分辨率紫外双通道共光路成像光谱仪。该成像光谱仪望远系统采用视场离轴的离轴三反结构，分光系统采用了具有小型轻量化优点的改进型Offner结构。通过对Offner光谱仪结构的理论推导，得出了满足超光谱分辨要求的双通道共光路Offner初始结构参数。为了提高成像光谱仪的成像质量，在Offner结构中引入弯月透镜，并对系统进行逐步优化。最终得到的双通道共光路成像光谱仪工作波段为280~300 nm和370~400 nm，在奈奎斯特频率为27.8 lp/mm时，双通道的调制传递函数（MTF）均优于0.8，全视场均方根半径（RMS）均小于9 μm，光谱分辨率均优于0.1 nm。本文研究对天基超光谱探测成像光谱仪小型化、集成化设计具有重要意义。
- Offner 光谱成像系统 /
- 光学设计 /
- 超光谱分辨率
Abstract:
Based on the requirement of multichannel detection for hyperspectral resolution imaging spectrometer, we design a hyperspectral resolution ultraviolet dual channel common optical path imaging spectrometer whose telescopic system adopts an off-axis three mirror structure with an off-axis field of view, and whose spectroscopic system applies a modified small and light weight Offner structure. Through the theoretical analysis of Offner spectrometer structures, initial structural parameters of a dual channel common optical path Offner that met the requirements of hyperspectral resolution were achieved. In order to improve the imaging quality of the imaging spectrometer, meniscus lenses were introduced into Offner structure, and the system was gradually optimized. Eventually, a dual channel common optical path imaging spectrometer was obtained with operating bands of 280~300 nm and 370~400 nm. When the Nyquist frequency is 27.8 lp/mm, the modulation transfer function (MTF) of both channels is better than 0.8, the full field mean square root radius (RMS) is less than 9 μm. and the spectral resolution is better than 0.1 nm. The design of this imaging spectrometer has important implications for the miniaturization and integration design of space-based hyperspectral detection imaging spectrometers.
- Offner spectral imaging system /
- optical design /
- hyperspectral resolution

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图 1 改进型Offner结构图

Figure 1. Schematic diagram of the improved Offner structure

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图 2 望远镜MTF图

Figure 2. MTF image of telescope system

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图 3 望远镜点列图

Figure 3. RMS image of telescope system

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图 4 望远镜结构图

Figure 4. Structure diagram of the telescope

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图 5 Offner分光系统

Figure 5. Offner spectroscopic system

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图 6 通道1 MTF曲线图

Figure 6. MTF image of channel 1

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图 7 通道2 MTF曲线图

Figure 7. MTF image of channel 2

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图 8 通道1点列图

Figure 8. Spot diagram of channel 1

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图 9 通道2点列图

Figure 9. Spot diagram of channel 2

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图 10 本文成像光谱仪结构图

Figure 10. Structure diagram of the proposed imaging spectrometer

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图 11 成像光谱仪整体通道1的MTF曲线图

Figure 11. MTF image of overall channel 1 in imaging spectrometer

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图 12 成像光谱仪整体通道2的MTF曲线图

Figure 12. MTF image of overall channel 2 in imaging spectrometer

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图 13 成像光谱仪整体通道1的点列图

Figure 13. Spot diagram of overall channel 1 in imaging spectrometer

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图 14 成像光谱仪整体通道2的点列图

Figure 14. Spot diagram of overall channel 2 in imaging spectrometer

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表 1 本文成像光谱仪的主要技术指标要求

Table 1. Main technical index requirements of the designed spectrometer

Parameter	Value
Height/km	600
Spectral range /nm	280~300、370~400
F	3.8
Swath/ km	100
Field of view /(°)	9.5
GSD/m	≤50
Spectral resolution /nm	≤0.1
Detector’s pixel size /μm	9×9
Detector’s array size /pixel	4096×4096
Sampling	2×2 binning
MTF	≥0.5@27.8 lp/mm

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表 2 系统最终的设计参数

Table 2. Final design parameters of the system

Parameter	Value
Spectral range /nm	280~300、370~400
F	3.8
Focal length of telescope f /mm	238
Field of view /(°)	9.5
GSD/m	45.37
Slit length/mm	40
diffraction order	1
grating period/nm	450
Spectral resolution /nm	0.069
MTF	>0.8@27.8 lp/mm
RMS/μm	<9

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参考文献(10)

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