大变倍比大相对孔径连续变焦红外光学系统研制
投稿时间:2018-04-16  修订日期:2018-05-14  点此下载全文
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作者单位E-mail
于 洋 中国科学院上海技术物理研究所 fishinwater99@hotmail.com 
周潘伟 中国科学院上海技术物理研究所  
潘兆鑫 中国科学院上海技术物理研究所  
蹇 毅 中国科学院上海技术物理研究所  
基金项目:国家十三五国防预研项目(Jzx2016-0404/Y72-2);上海市现场物证重点实验室基金资助项目(2017xcwzk08);中国科学院青年创新促进会(2016220资助);中科院上海技术物理所三期创新项目(CX-72)
中文摘要:提出了一种新型连续变焦结构形式,在现有经典四组元机械补偿变焦模型的基础上,添加一个独立的变倍组,利用二个变倍组级联的方式获得超大变倍比,并推导了数学模型。在此基础上,针对制冷型中波探测器,研制了一套大变倍比大相对孔径连续变焦红外光学系统,解决了大相对孔径红外变焦系统变倍比难以提高的问题。该光学系统工作波长3.7~4.8um,冷光阑效率100%,可实现从焦距6毫米至330毫米的连续变焦,在F数恒定为2的同时,变倍比高达55倍。该系统仅包含八片镜片,其中三片镜片独立运动实现变焦。设计结果显示,该系统在6毫米至330毫米的焦距范围内,变焦曲线平滑、像质良好。实验室测试和外场成像结果显示,该系统在整个焦距范围内成像效果清晰,达到设计要求,验证了这种新型连续变焦数学模型的应用效果。
中文关键词:大变倍比、大相对孔径、连续变焦、红外光学系统
 
Realization of a Continuous-Zoom Infrared Optical Systemwith High Ratio and Large Relative Aperture
Abstract:A new continuous zoom structure was described, and a new independent zoom group was added on the classical four-group-mechanical-compensation. And larger zoom ratio was achieved by the way of two zoom groups cascading. This mathematical model was deduced. Then, according to the cooled mid-wave infrared detector, a continuous-zoom infrared optical system with large zoom ratio and large relative aperture was designed. And the problem that it’s hard for a zoom optical system to achieve both large zoom ratio and large relative aperture was solved. This optical system can zoom from 6mm to 330mm, which means it can reach 55x zoom ratio while the F number is 2 constantly. The working waveband was 3.7-4.8um, the cold shield efficiency was 100%.It contains only eight lenses, three of them move in order to change the focal length. The result shows that the zoom curves are quite smooth and the image quality is quite good in the whole zoom range. The laboratory test and the out-door imaging experiment shows that the image quality is quite good in the whole zoom range. It proves the application effect of this new kind of zoom model, and shows that the system reaches its design goal.
keywords:: large  zoom ratio, large  relative aperture, continuous  zoom, infrared  optical system
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