中波红外宽波段多光谱成像光学系统设计

王海洋; 明景谦; 贾星蕊; 付艳鹏; 刘永杰; 王贵全; 杨静

中波红外宽波段多光谱成像光学系统设计

1.
昆明物理研究所, 云南昆明 650223
2.
昆明北方红外技术股份有限公司, 云南昆明 650217

基金项目:

国家重点研发计划 2017YFA0701200

详细信息

作者简介:
王海洋（1983-），男，正高级工程师，硕士，主要从事红外光学设计及红外光谱成像技术方面的研究。jlyjwhy@163.com

中图分类号: TN216
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-27
- 修回日期: 2022-09-07
- 刊出日期: 2022-10-20

Optical Design of Multispectral Imaging Spectrometer in Broadband Mid-wave Infrared

1.
Kunming Institute of Physics, Kunming 650223, China
2.
Kunming North Infrared Technology Co., Ltd., Kunming 650217, China

摘要

摘要: 本文设计了一种基于滤光片的制冷型中波红外宽波段（2.7~5 μm）多光谱双视场成像光学系统，可将不同波段的红外场景辐射透过相应的滤光片成像在红外制冷型探测器上。本系统将多个滤光片置于滤光轮上，并放置在探测器前，不仅能减小滤光片的有效口径，同时还兼容图像的非均匀校正功能。通过转动滤光轮，系统能够得到多个所需的图谱信息，通过差分技术可以更好地提取目标信息，提升灵敏度。该系统F数为4，焦距为70 mm/280 mm，MTF接近衍射极限，具有－50℃~80℃的主动消热差功能，满足应用要求。
- 多光谱 /
- 中波红外宽波段 /
- 光学系统设计
Abstract: A cooling-type mid-wave infrared broadband (2.7 to 5 μm) multi- spectral dual-field imaging optical system based on a filter and cooled detector is designed. A scene can be imaged by using an infrared-cooled detector through the corresponding filter. In this system, the filter wheel with multiple filters is placed in front of the detector to minimize the aperture of the filters and provide compatibility with non-uniformity correction functions. The filter wheel is rotated to obtain multiple required spectrum information, and the differential technology can better extract the target information and improve the sensitivity. The F-number of the system is 4, focal length is 70 mm/280 mm, and modulation transfer function is close to the diffraction limit. The system has an optical active athermalization function in the range of −50℃ to 80℃. The simulation results show that the performance of the system can meet the design requirement.
- multispectral /
- mid-wave infrared broadband /
- optical system design

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图 1 差分技术示意图^[6]

Figure 1. Schematic diagram of differential technology^[6]

下载: 全尺寸图片幻灯片

图 2 中波红外多光谱成像系统原理

Figure 2. Principle of MWIR multispectral imaging system

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图 3 轴向移动式结构示意图

Figure 3. Schematic diagram of axially movable structure

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图 4 22℃时的光学系统示意图

Figure 4. Schematic of the optical system at 22℃

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图 5 22℃时的光学系统调制传递函数（MTF）

Figure 5. MTF of optical system at 22℃

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图 6 22℃时的光学系统点列图

Figure 6. Spot diagram of optical system at 22℃

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图 7 22℃时的光学系统场曲和畸变

Figure 7. Curvature of field and distortion of the optical system at 22℃

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图 8 －50℃时的光学系统调制传递函数（MTF）

Figure 8. MTF of optical system at -50℃

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图 9 －50℃时的光学系统弥散斑点列图

Figure 9. Spot diagram of optical system at -50℃

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图 10 80℃时的光学系统调制传递函数（MTF）

Figure 10. MTF of optical system at 80℃

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图 11 80℃时的光学系统弥散斑点列图

Figure 11. Spot diagram of optical system at 80℃

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表 1 技术指标

Table 1. Technical indicators

Parameters	Value
Waveband/μm	2.7 to 5
F-number	4
Focal length/mm	70/280
Field of view/°	7.85×6.28/1.96×1.57
Distortion	≤3%
Overall length/mm	≤250
Work temperature/℃	−50 to 80

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参考文献(8)

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