大相对孔径变焦红外光学系统无热化设计

陈潇

大相对孔径变焦红外光学系统无热化设计

陈潇

南京邮电大学通达学院，江苏扬州 225127

基金项目:

学院级科研项目 XK202XZ20006

学院级项目 JG02121JX26

详细信息

作者简介:
陈潇（1985-），女，陕西西安人，硕士，中级工程师（讲师），从事光学类课程教学工作，主要研究方向为红外光学设计。E-mail：chenxiao.45678@163.com

中图分类号: O439
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出版历程
- 收稿日期: 2021-06-27
- 修回日期: 2021-07-06
- 刊出日期: 2021-12-19

Athermalization of Infrared Zoom Optical System with Large Relative Aperture

CHEN Xiao

Tongda College of Nanjing University of Post & Telecommunications, Yangzhou 225127, China

摘要

摘要: 随环境温度变化红外镜头会产生热离焦现象，一般定焦红外光学系统可通过多种红外材料组合或引入衍射面来实现光学被动式无热化设计，而变焦红外光学系统大多是通过移动透镜组来实现机械主动式无热化设计。文中根据光学变焦原理和光学被动式无热化原理，提出一种变焦光学被动式无热化设计方法，并采用该方法设计了一种大相对孔径双视场无热化长波红外光学系统。该系统焦距为25/50 mm（变倍比为2:1），工作波段为8~12 μm，F数为0.9，可匹配640×512，像元为17 μm×17 μm的非制冷红外焦平面阵列探测器。光学设计中采用3种红外光学材料（硫系玻璃HWS6、硒化锌和锗）组合，并引入3个偶次非球面，实现变焦无热化设计。设计结果表明：该系统在宽温度范围内具有良好的成像效果和温度自适应性，在空间频率30 lp/mm处，-50℃~80℃温度范围内各视场MTF均大于0.3。该红外光学系统结构简单、工艺良好，在红外车载领域有着广泛应用前景。
- 变焦系统 /
- 光学被动无热化 /
- 硫系玻璃 /
- 大相对孔径
Abstract: As the ambient temperature changes, the thermal defocus of optical lenses occurs in infrared lenses. The passive thermal design of an infrared prime lens can be realized by the combination of infrared materials and the introduction of a diffraction surface. However, most infrared zoom lenses are designed using active mechanical compensation. In this study, a passive athermalization design method for zoom optics is proposed based on the principles of zoom optical system and passive optical athermalization, and a long-wave infrared athermalization lens with a large relative aperture and dual field of view is achieved using this method. The focal length was 25/50 mm (with 2 zoom ratio), the wavelength band was 8–12μm, and the F number is 0.9. The system was based on a 640×512 uncooled infrared focal plane detector with a pixel size of 17 μm×17 μm. Three LWIR materials were used in the system, namely Ge, ZnSe, and HWS6, and three high-order aspheric surfaces were introduced to realize the athermalization zoom design. The final design exhibits good imaging quality and temperature applicability over a wide temperature range. In the temperature range of -50℃ to 80℃, the MTF is greater than 0.3 at 30 lp/mm. The system structure is simple, has good usability, and has broad application prospects in the field of infrared vehicles.
- zoom system /
- passive optical athermalization /
- chalcogenide glass /
- large relative aperture

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图 1 变焦光学系统光路图

Figure 1. Layout of the zoom optical system

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图 2 变焦光学系统MTF图

Figure 2. MTF curves of the zoom optical system

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图 3 系统公差设置

Figure 3. Tolerance data

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图 4 公差蒙特卡罗分析结果

Figure 4. The results of tolerance Monte Carlo analysis

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表 1 光学设计参数

Table 1 Optical design parameters

Wavelength range	8~12 μm
Efficient focal length	25/50mm
F number	0.9
Field of view	31.16°/15.87°
Image size(diagonal)	13.93 mm
Temperature range	-50℃ to + 80℃

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表 2 长焦和短焦的像面热离焦量

Table 2 Thermal defocus of long and short focal μm

	20℃	-50℃	+80℃
Wide field	0	-12.26	-2.16
Narrow field	7.48	-11.15	10.64

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表 3 无热化后-50℃~+80℃弥散斑均方根半径

Table 3 Spot diagram during -50℃ to +80℃ after athermalized μm

		20℃	-50℃	+80℃
25 mm	0°	6.083	4.772	7.618
	22°	11.482	9.878	13.481
	31.2°	9.862	10.658	11.117
50 mm	0°	5.922	6.153	6.577
	11.2°	8.402	8.018	9.538
	15.9°	11.554	13.797	10.474

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参考文献(8)

[1]	葛琳琳, 王世先, 张瑞, 等. 基于硫系玻璃的光学被动式红外无热化镜头设计[J]. 红外, 2020, 41(2): 7-12. DOI: 10.3969/j.issn.1672-8785.2020.02.002 GE Linlin, WANG Shixian, ZHANG Rui, et al. Design of optical passive infrared non-thermal lens based on chalcogenide glass[J]. Infrared, 2020, 41(2): 7-12. DOI: 10.3969/j.issn.1672-8785.2020.02.002
[2]	王静, 吴越豪, 戴世勋, 等. 硫系玻璃在长波红外无热化连续变焦广角镜头设计中的应用[J]. 红外与激光工程, 2018, 47(3): 156-162. https://www.cnki.com.cn/Article/CJFDTOTAL-HWYJ201803022.htm WANG Jing, WU Yuehao, DAI Shixun, et al. Application of chalcogenide glass in designing a long-wave infrared athermalized continuous zoom wide-angle lens[J]. Infrared and Laser Engineering, 2018, 47(3): 156-162. https://www.cnki.com.cn/Article/CJFDTOTAL-HWYJ201803022.htm
[3]	白瑜, 廖志远, 李华, 等. 硫系玻璃在现代红外热成像系统中的应用[J]. 中国光学, 2014, 7(3): 449-455. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGA201403014.htm BAI Yu, LIAO Zhiyuan, LI Hua, et al. Application of the chalcogenide glass in modern infrared thermal imaging systems[J]. Chinese Optics, 2014, 7(3): 449-455. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGA201403014.htm
[4]	赵延, 邓键, 于德志, 等. 光学被动消热差的长波红外双视场光学系统设计[J]. 红外与激光工程, 2014, 43(5): 1545-1548. DOI: 10.3969/j.issn.1007-2276.2014.05.035 ZHAO Yan, DENG Jian, YU Dezhi, et al. Design of dual field-of-view optical system in long wave infrared with optical passive athermalization[J]. Infrared and Laser Engineering, 2014, 43(5): 1545-1548. DOI: 10.3969/j.issn.1007-2276.2014.05.035
[5]	陈建发, 王合龙. 双视场长波红外光学系统无热化设计[J]. 激光与光电子学进展, 2013, 50(6): 129-133. https://www.cnki.com.cn/Article/CJFDTOTAL-JGDJ201306023.htm CHEN Jianfa, WANG Helong. Athermalization design of dual-field-of-view long wavelength infrared optical system[J]. Laser & Optoelectronics Progress, 2013, 50(6): 129-133. https://www.cnki.com.cn/Article/CJFDTOTAL-JGDJ201306023.htm
[6]	邓键, 童卫红, 安晓强, 等. 双视场红外变焦镜头的无热化研究[J]. 应用光学, 2011, 32(1): 133-137. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX201101032.htm DENG Jian, TONG Weihong, AN Xiaoqiang, et al. Athermalization of infrared zoom system[J]. Journal of Applied Optics, 2011, 32(1): 133-137. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX201101032.htm
[7]	LI S H, YANG C C. Optical passive athermalization for infrared zoom system[C]//Proc. of SPIE, 2007, 67224E: 1-8.
[8]	王文生. 现代光学系统设计[M]. 北京: 国防工业出版社, 2016: 106-110. WANG Wensheng. Contemporary Optical System Design[M]. Beijing: National Defense Industry Press, 2016: 106-110.