【摘要】 针对坦克红外观瞄系统的总体设计要求,为了满足战场环境下红外目标探测的需求,设计了一种制冷式红外长波折衍混合消热差摄远物镜。摄远物镜由物镜组和中继镜组构成,焦距为-200 mm,F数为2.1,全视场角为3.6°.探测器选用Sofradir公司生产的MARS-VLW型红外长波焦平面阵列,其分辨率为320×256像素,象元尺寸为30μm×30μm.试验结果表明:在截止频率17 cy/mm时,温度-40℃~60℃范围内,该摄远物镜各视场的调制传递函数(MTF)均大约为0.5,点列图均方根半径均远小于艾利斑半径34.5μm,并实现了100%冷光阑效率。该红外摄远物镜虽然是针对坦克红外观瞄系统的要求而设计的,但其结构紧凑,在-40℃~60℃温度范围内,像质优良且稳定,也可用于其他红外观瞄系统。更多还原

【Abstract】 According to the overall design requirement of tank infrared observing-aiming system,a cooled LWIR refractive / diffractive athermal telephoto objective is designed in order to meet the requirements of infrared target detection in battlefield environments. The telephoto objective is composed of objective and relay lens. The focal length is-200 mm,the F number is 2. 1,and the full field of view is 3. 6°. The detector is the MARS-VLW LWIR focal plane array produced by Sofradir Company. Its resolution is 320 × 256 pixels,and the pixel size is 30 μm × 30 μm. The image quality of this telephoto objective is excellent. In the temperature range of-40 ℃ ~ 60 ℃,MTF of each field of view is about 0. 5 at the cutoff frequency of 17 cy / mm,the root mean square radius of spot diagram for each field of view is much smaller than the Airy spot radius(34. 5 μm). The cold-shield efficiency is 100%. This infrared telephoto objective can be used for other infrared observing-aiming system.更多还原