| 大相对孔径变焦红外光学系统无热化设计 |
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| 引用本文： | 陈潇.大相对孔径变焦红外光学系统无热化设计[J].红外技术,2021,43(12):1183-1187. |
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| 作者姓名： | 陈潇 |
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| 作者单位： | 南京邮电大学 通达学院,江苏 扬州 225127 |
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| 基金项目： | 学院级科研项目XK202XZ20006学院级项目JG02121JX26 |
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| 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。
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| 关 键 词： | 变焦系统 光学被动无热化 硫系玻璃 大相对孔径 |
| 收稿时间： | 2021-06-28 |
Athermalization of Infrared Zoom Optical System with Large Relative Aperture |
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| Affiliation: | Tongda College of Nanjing University of Post & Telecommunications, Yangzhou 225127, China |
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| 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. |
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