大变倍比制冷型长波红外变焦光学系统设计

唐晗; 夏丽昆; 刘炼; 刘云; 刘炫; 刘愚; 张润琦; 周春芬; 杨开宇

doi:10.37188/CO.2023-0052

大变倍比制冷型长波红外变焦光学系统设计

doi: 10.37188/CO.2023-0052

唐晗^1, ,,
夏丽昆²,
刘炼³,
刘云⁴,
刘炫¹,
刘愚¹,
张润琦¹,
周春芬¹,
杨开宇¹

1.
昆明物理研究所, 云南昆明 650223
2.
陆军装备部驻重庆地区军事代表局, 重庆 400000
3.
空军装备部驻成都地区军事代表局, 四川成都 610000
4.
海军装备部驻广州地区军事代表局, 广东广州 510320

基金项目: 国家重点研发计划（0701200）

详细信息

作者简介:
唐晗(1984-)，男，湖南衡阳人，硕士，高级工程师，2010 年于中国兵器科学研究院获得硕士学位，主要从事红外成像系统研发设计。E-mail: 15887167873@163.com

中图分类号: TN216
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出版历程
- 网络出版日期: 2023-10-08

Design of cooled lwir large ratio zoom optical system

1.
Kunming Institute of Physics, Kunming 650223, China
2.
Army Equipment Department in Chongqing Military Agency Bureau, Chongqing 400000, China
3.
Air Force Equipment Department in Chengdu Military Agency Bureau, Chengdu 610000, China
4.
Naval Equipment Department of Guangzhou Military Agency Bureau, Guangzhou 510320, China

Funds: Supported by National Key Research and Development Program of China (0701200)

More Information

Corresponding author: 15887167873@163.com

摘要

摘要:
随着制冷型长波红外焦平面探测器空间分辨率及面阵规格的提升，制冷型长波红外热像仪应用范围越来越广，需提升相应光学系统以满足不同领域需求。长波红外变焦光学系统相对于中波红外变焦光学系统存在可用材料少、系统高低温环境无热化难度大等难题。本文采用机械补偿变焦技术实现光学多视场变焦，利用主动补偿的消热差技术达到系统在−40 °C~+65 °C温度范围成像清晰，实现四片透镜架构的制冷型长波红外四视场光学系统设计。该光学系统四视场焦距分别为25 mm、109 mm、275 mm、400 mm，变倍比为15.0^×，光学系统包络尺寸为268 mm（长）×200 mm（宽），光学零件总质量618 g。该光学系统具有质量轻、性能高、成本低等SWaP-C特征，将在辅助导航、搜索、跟踪等安防领域中得到广泛应用。
- 制冷型长波红外 /
- 变焦光学系统 /
- 机械补偿 /
- 无热化
Abstract:
With the improvement of the spatial resolution and area array specifications of the cooled LWIR focal plane detector, the application range of the cooled LWIR thermal imager is becoming wider and wider, and the corresponding optical system needs to be improved to meet the needs of different fields. Compared with the MWIR optical zoom system, the LWIR optical zoom system has fewer available materials and is difficult to athermalize in high and low temperature environments. In this paper, the multi-field optical zoom system is realized by using mechanical compensation zoom technology, and the active compensation athermalization technology is used to make the system image clear from −40 °C to +65 °C, to realize the design of the four-field LWIR optical system with four lenses. The focal lengths of the four fields of view are 25 mm, 109 mm, 275 mm and 400mm, the zoom ratio is 15, the envelope of the optical system is 280 mm(L)×200 mm(W), and the total weight of the optical components is 618 g. The optical system has SWaP-C characteristics such as light weight, high performance, and low cost, and will be widely used in security fields such as auxiliary navigation, search, and tracking.
- cooled long-wave infrared /
- zoom optic system /
- mechanical compensation /
- athermalization

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图 1 光学补偿变焦模型原理图

Figure 1. Schematic diagram of an optically compensated zoom model

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图 2 机械补偿变焦模型原理图

Figure 2. Schematic diagram of mechanical compensated zoom model

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图 3 双组联动变焦模型原理图

Figure 3. Schematic diagram of double group linkage zoom model

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图 4 光学变焦系统多重结构图

Figure 4. Multiple configurations of optical zoom system

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图 5 光学系统布局图

Figure 5. Configuration of optical zoom system

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图 6 光学系统调制传递函数

Figure 6. MTF curves of optical system

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图 7 光学系统点列图

Figure 7. Spot diagrams of optical system

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图 8 光学系统畸变情况

Figure 8. Distortion diagrams of optical system

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图 9 低温−40 °C环境光学系统传函

Figure 9. MTF curves of optical system at −40 °C

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图 10 高温+65 °C环境光学系统传函

Figure 10. MTF curves of optical system at +65 °C

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图 11 二元衍射面相位与元件直径的关系

Figure 11. The Relationship between phase and diameter of the BOE

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图 12 大视场冷反射信噪比

Figure 12. Cold reflection signal-to-noise ratio of WFOV

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表 1 光学系统技术指标

Table 1. Parameters of optical system

Spectral range	7.7 μm~9.5 μm
Horizontal field of view	21.0°、5.0°、2.0°、1.38°
Focal length /mm	25、109、275、400
F#	15.0∶1
Focal length /mm	25、109、275、400
Working temperature	−40℃~65℃

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表 2 光学系统初始参数取值

Table 2. Initial parameters of optical system

ZR	$ f_2' $	$ f_3' $	$ \beta _2' $
15	−1	1.62	−1.45
$ \beta _3' $	$ \beta _4' $	$ {d}_{12} $	$ {d_{34}} $
−1.34	1	0.55	0.55

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表 3 变焦系统初始间隔

Table 3. Zoom system initial spacing

系统焦距（mm）	400	275	109	25
f₁/f₂ 间隔(mm)	133.2	126.8	105.3	23.6
f₂/f₃ 间隔(mm)	16.3	36.1	82.2	192.1
f₃/f₄ 间隔(mm)	89.8	76.4	51.8	23.6

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表 4 公差最严重项目

Table 4. Maximum tolerance items

公差操作项	表面	设置值（mm）	RMS改变值(mm)
TSDX	5	±0.005	0.00315
TSDY	5	±0.005	0.00315
TSDX	6	±0.005	0.00315
TSDY	6	±0.005	0.00315
TIRR	2	±0.5	0.00089

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