摘要
为满足民用车载红外视觉增强系统的迫切需求，针对384×288型像元尺寸为38μm×38μm的非制冷探测器，利用衍射元件的光热特性采用光学被动式消热差方法设计了一个折／衍混合大像面长波红外消热差镜头，介绍了折／衍光学元件的温度特性及设计消热差系统的原理。通过合理的选择衍射面的基底材料，用CODEV对系统进行优化设计。设计结果表明：系统在工作波段8～12肚m，f=21mm，F数为1．4时在-40℃-80℃的温度范围内调制传递函数MTF大于O．3，符合消热差系统的条件。
In order to meet IR vision enhancement system＇s urgent need for civilian vechicle, a Hybrid Refractive/Dif- fractive LIR Athermal Lens was designed by using the characteristics both light and thermal of diffractive optical ele- ments and taking measures to the passive optical athermallization method for an uncooled detector with 384×288 pixel and 38μm×38μm, the temperature characteristics of refractive/diffractive optical elements and the theroy of desiging a athermal system was introduced.Through rationally selecting the substrate material of diffractive surface, the system was optimized with CODEV.The result indicated that while the wavelength of the system was 8-12μm, the focal length was 21ram, F number was 1.4, the modulation transfer function （MTF） was greater than 0.3 at the temperature range from -40℃-80℃, the requriments for athermal system was satisfied.
出处
《长春理工大学学报（自然科学版）》
2013年第6期20-23,共4页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
衍射元件
光学被动式
消热差
diffractive optical elements
passive optical athermallization
athermal
