长波红外变焦光学系统设计 |
投稿时间:2017-04-13 修订日期:2017-04-24 点此下载全文 |
引用本文:虞翔.长波红外变焦光学系统设计[J].红外,2017,38(10):13~19 |
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基金项目:上海市浦江人才项目(15PJ1409000) |
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中文摘要:针对像元尺寸为17 μm×17 μm的
非致冷型640×480元探测器,基于补偿组兼顾调焦群作用的Varifocal
结构,仅用4片透镜就设计出了一种变倍比为6×的长波红外连续变焦光学
系统。针对低成本、高透波率的指标要求,通过理论计算得到了初始结
构,并用CodeV软件对其像差进行了优化,最后针对设计结果进行了
凸轮曲线求解和像质评价。结果表明,当
工作在8~12 μm波段时,在相对孔径1.4 : 1保持不变的条件下,该系统实
现了焦距从20 mm到120 mm的连续变焦,而且空间频率20 lp/mm处的调
制传递函数(Modulation Transfer Function, MTF)值均大于0.5。通过样机实测发现,该系统
具有变倍比大、结构紧凑和分辨率高等特点,因而适用于红外监控设
备。 |
中文关键词:光学设计 红外变焦 变焦点 长波红外 |
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Design of High Ratio LWIR Varifocal System |
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Abstract:According to a 640×480 uncooled
detector with pixel size of 17 μm×17 μm, a
long wavelength infrared varical optical system with varifocal
ratio of 6× is designed with only 4 lenses. To meet the
requirements of low cost and high transmission, an initial configuration
is obtained through theoretical calculation. The aberration of the
initial configuration is optimized by using the CodeV software.
Finally, cam curve solution and image quality evaluation are carried
out for the design result. The result shows that when the relative
aperture of 1.4:1 is kept, the optical system can realize continuous
zooming from 20 mm to 120 mm in the 8 to 12 μm waveband. The Modulation
Transfer Function (MFT) at the spatial frequency of 20 lp/mm is greater
than 0.5. It is found in the actual measurement of the prototype that the
optical system has the features of large zooming ratio, compact configuration
and high resolution. It is suitable for infrared monitoring systems. |
keywords:optical design infrared zoom system varifocal long wave infrared |
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