机载小型化中波红外连续变焦光学系统设计

吴海清; 王玮超

机载小型化中波红外连续变焦光学系统设计

吴海清^1,,
王玮超²

1.
凯迈(洛阳)测控有限公司，河南洛阳 471009
2.
洛阳建工集团有限公司，河南洛阳 471009

详细信息

作者简介:
吴海清（1982-），男，陕西榆林人，高级工程师，硕士，主要研究方向为成像光学系统设计。E-mail: whqcust@163.com

中图分类号: O439; TH74
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-01
- 修回日期: 2021-11-25
- 刊出日期: 2021-12-20

Design of Airborne Miniaturized Middle Wavelength Infrared Continuous Zoom Optical System

WU Haiqing^1
,,
WANG Weichao²

1.
CAMA(Luoyang) Measurement and Control Co. Ltd., Luoyang 471009, China
2.
Luoyang Construction Engineering Group Co. Ltd., Luoyang 471009, China

摘要

摘要: 为适应机载光电系统对红外热像仪光学系统小型化、轻量化的要求，采用前端无焦扩展倍镜与后端连续变焦光学系统组合的方式，实现了30~660 mm的22倍连续变焦光学系统。该系统的光学总长为244 mm，总长/最大焦距比为0.37，系统具有光学总长小、变倍比大的特点，适用于远距离目标探测的大型机载光电吊舱系统中。将前端无焦扩展倍镜去掉后，后端连续变焦光学系统可以实现15~330 mm的22倍连续变焦光学系统，该系统的光学总长为138 mm，总长/最大焦距比为0.42，可作为独立的连续变焦系统应用于近距离目标探测的中小型机载光电吊舱系统中。设计结果显示，该系统在两种状态下均成像良好，在探测器对应的特征频率33 1p/mm处，中心视场的MTF值均在0.3附近，接近衍射极限，0.7视场的MTF值均在0.2附近，边缘视场的MTF均在0.15附近，能够满足应用需求。
- 小型化 /
- 光学设计 /
- 连续变焦系统 /
- 中波红外
Abstract: To satisfy the requirements of an airborne electro-optical system for miniaturized and lightweight optical system of an infrared thermograph, a 22^× continuous zoom optical system of 30–660 mm was realized by combining front-end afocal extender and back-end continuous zoom optical system. The total optical length of the system was 244 mm, and the total length/maximum focal length ratio was 0.37. The system had a small optical length and large zoom ratio, which makes the system suitable for large airborne electro-optical pod systems for long-distance detection. Upon removing the front afocal extender, the back-end system could achieve a 22^× continuous zoom optical system of 15 to 330 mm. The total optical length of the system was 138 mm, and the total length/maximum focal length ratio was 0.42. The system can be used as a continuous zoom optical system in small-and medium-sized airborne electro-optical pod systems for close-range target detection. The design results exhibit that the system can capture images effectively in both states: at the characteristic frequency of 33 lp/mm corresponding to the detector, all the MTF values of the central field view were approximately 0.3, close to the diffraction limit, all the MTF values of the 0.7 field view were approximately 0.2, and all the MTF values of the edge field view were approximately 0.15, which satisfies the application requirements.
- miniaturization /
- optical design /
- continuous zoom system /
- middle wavelength infrared

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图 1 连续变焦光学系统组成

Figure 1. Continuous zoom optical system composition

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图 2 机械正组补偿连续变焦原理图

Figure 2. Schematic diagram of mechanically compensated zoom system

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图 3 焦距为15 mm时的光路图

Figure 3. Optical system layout at 15 mm

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图 4 焦距为330 mm时的光路图

Figure 4. Optical system layout at 330 mm

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图 5 带增倍镜焦距为30 mm时的光路图

Figure 5. Optical system layout with extender at 30 mm

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图 6 带增倍镜焦距为660 mm时的光路图

Figure 6. Optical system layout with extender at 660 mm

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图 7 焦距为15 mm时的MTF

Figure 7. MTF graph with focal length of 15 mm

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图 8 焦距为330 mm时的MTF

Figure 8. MTF graph with focal length of 330 mm

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图 9 带扩展倍镜焦距为30 mm时的MTF

Figure 9. MTF graph with focal length of 30 mm with extender

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图 10 带扩展倍镜焦距为660 mm时的MTF

Figure 10. MTF graph with focal length of 660 mm with extender

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图 11 焦距为15 mm时的点列图

Figure 11. Spot diagram when the focal length is 15 mm

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图 12 焦距为330 mm时的点列图

Figure 12. Spot diagram when the focal length is 330 mm

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图 13 带扩展倍镜焦距为30 mm时的点列图

Figure 13. Spot diagram when the focal length is 30 mm with extender

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图 14 带扩展倍镜焦距为660 mm时的点列图

Figure 14. Spot diagram when the focal length is 660 mm with extender

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图 15 光学系统变倍组、补偿组变焦运动曲线

Figure 15. Zoom curves of continuous zoom subsystem

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表 1 光学系统技术指标

Table 1. Optical design parameters

Parameter	Value
Detector size	640×512(cooled)
Pixel size	15 μm
Wavelength	3.7 to 4.8 μm
F number	4
Focal length	15 to 330 mm(without extender)
Focal length	30 to 660 mm(with extender)
Total length	138 mm(without extender)
Total length	244 mm (with extender)

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参考文献(7)

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