Design of the infrared dual-band athermalized optical system based on HDE
Design of the infrared dual-band athermalized optical system based on HDE
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DOI：
10.1117/12.835737
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
Ke-yan Dong;Liang Zhang;Jian Wang;Hongliang Wang;Qiang Sun;Zhenwu Lu
中科院分区：
文献类型：
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作者：
Ke-yan Dong;Liang Zhang;Jian Wang;Hongliang Wang;Qiang Sun;Zhenwu Lu
利用谐衍射元件的消热差能力和特殊的衍射特性，设计并制作了一套采用非制冷长波红外探测器和制冷中波红外探测器的双波段红外光学系统。设计结果表明，在中波红外波段，F/#为2，焦距为72 mm，在-40 °C ~ 70°C温度范围内，MTF值在20 lp/mm时大于0.4;而在LW IR波段中F/#为1并且焦距为114 mm，在-40° ~ 70°的温度范围内，在10 lp/mm处，MTF值大于0.5。采用有限元法对系统的光机结构进行了热分析，证实了系统在较宽温度范围内的成像能力。
A dual-band infrared optical system adopting an uncooled LW infrared detector and a cooled MW infrared detector is designed and manufactured, based on the athermal ability and special diffractive properties of harmonic diffractive elements. The design shows in the MW IR band the F/# is 2 and the focal length is 72 mm, for the temperature range -40 °C ~ 70°C the MTF value is over 0.4 at 20 lp/mm; while in the LW IR band the F/# is 1 and the focal length is 114 mm, for the temperature range -40° ~ 70° the MTF value is over 0.5 at 10 lp/mm. Finite element method is applied to the opto-mechanic structure of the system for thermal analysis, which confirms the imaging ability of the system in a wide temperature range.