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20倍非制冷长波红外连续变焦光学系统的设计
投稿时间:2017-02-05  最后修改时间:2017-02-28  点此下载全文
引用本文:陶郅,王敏,肖维军.20倍非制冷长波红外连续变焦光学系统的设计[J].红外,2017,38(5):19~26
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作者单位E-mail
陶郅 福建师范大学光电与信息工程学院 taozhieu@164.com 
王敏 福建师范大学光电与信息工程学院 mwang@fjnu.edu.cn 
肖维军 福建福光股份有限公司  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);
中文摘要:基于像元大小为25 μm 的384×288非制冷型凝视焦平面阵列探测器,设计了一种20倍非制冷长波红外连续变焦光学系统。该系统的工作波段为8~12 μm,F数为1.3,具有相对孔径大、变倍比大和变焦凸轮曲线平滑等优点。该系统共有7片镜片,使用2种材料组组合,其中多数透镜使用常用的锗材料,以减少使用昂贵材料和便于加工。通过使用1片衍射面元件和2片非球面元件实现了紧凑的结构。该系统的奈奎斯特空间频率为20 lp/mm,短焦、长焦的调制传递函数(Modulation Transfer Function, MTF)大于0.4,中焦MTF大于0.58。 MTF值体现出该系统具有极好的像质特征。
中文关键词:光学设计  变焦  长波红外  大相对孔径
 
Design of a 20× Uncooled Thermal Long Wavelength Infrared Continuous Zoom Optical System
Abstract:On the basis of a 384×288 uncooled staring focal plane array detector with pixel size of 25 μm, a 20-fold uncooled long wavelength infrared continuous zoom optical system is designed. The operation waveband of the system is 8~12 μm and its F number is 1.3. It has the advantages of larger relative aperture, higher zoom ratio and smooth zoom path etc. The system consists of seven lenses which are made from a combination of two kinds of materials. Most of the lenses are made from common germanium material so as to reduce the use of expensive materials and be easy for processing. By using one diffraction optical element and two aspheric elements, a compact structure of the system is realized. The system has its Nyquist spatial frequency of 20 lp/mm, Modulation Transfer Function (MTF) greater than 0.4 for short focus and long focus and MTF greater than 0.58 for middle focus. These MTF values show that the system has excellent image quality.
keywords:optical design  zoom  long wavelength infrared  large relative aperture
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