| 轻型折衍混合中波红外变焦光学系统设计 |
| 投稿时间：2022-10-09 修订日期：2022-11-17 点此下载全文 |
| 引用本文：周阳,谢佳丽.轻型折衍混合中波红外变焦光学系统设计[J].红外,2023,44(2):35~40 |
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| 中文摘要:针对640×512元制冷型中波红外焦平面探测器，采用二次成像的光学结构以及机械正组补偿变焦方式，在设计中引入了硅基衍射光学元件，从而构成折衍混合变焦光学系统。设计结果表明，光学系统使用了7片镜片，在3.7~4.8 μm波段实现了15~300 mm连续变焦，在空间频率33 lp/mm处的调制传递函数(Modulation Transfer Function, MTF)接近衍射极限。光学镜片的总重量仅有86 g，光学系统的总长度为139 mm。该系统具有变倍比大、分辨率高、重量轻、体积小等特点。 |
| 中文关键词:折衍混合；大变倍比；连续变焦 轻型化 |
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| Design of the Light-Weight Hybrid Refractive-Diffractive Medium-Wave Infrared Zoom Optical System |
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| Abstract:Aiming at the 640×512 cooled medium-wave infrared focal plane detector, the optical structure of secondary imaging and the compensatory zoom mode of mechanical positive group are adopted, and the silicon diffraction optical element is used in the design, so as to form the refractive-diffractive hybrid zoom optical system. The results show that MTF is close to the diffraction limit at the spatial frequency of 33 lp/mm. 7 lenses are used in the optical system, and 15－300 mm continuous zoom is achieved in the band of 3.7－4.8 μm. The total weight of the optical lens is only 86 g and the total length of the optical system is 139 mm. The optical system has the characteristics of large multiplier ratio, high resolution, light weight and small size. |
| keywords:hybrid refractive-diffractive large zoom-ratio continuous zoom light-weight |
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