星载高分辨率红外双谱段遥感器光学系统设计北大核心CSCD

针对高精度红外遥感成像的应用需求,提出了高空间分辨率、高噪声等效温差和大幅宽的中波/长波红外双谱段遥感成像技术方案,在太阳同步轨道获取地面目标的中波和长波红外辐射信息,谱段范围分别为3~5μm和8~12μm,中波红外谱段空间分辨率优于5 m,长波红外谱段空间分辨率优于10 m,幅宽大于20 km,噪声等效温差优于60 mK。根据噪声等效温差和光学传递函数等要求优化了光学系统指标参数,分析了二次成像同轴三反光学系统的冷光阑匹配原理,计算了光学系统初始结构参数,设计了光阑匹配型和出瞳匹配型中波/长波红外双谱段一体化光学系统,比较了两种方案光学系统的冷光阑匹配效果。

Optical system design of high resolution dual band IR remote sensor

For the application requirements for high precision infrared remote sensing imaging,a middle-wavelength and long-wavelength infrared remote sensing imaging solution with high resolution,high noise equivalent temperature difference(NETD)and large swatch is put forward.It can get the middle-wavelength and long-wavelength infrared radiation information of ground targets on sun-synchronous orbit simultaneously,with the infrared range of 3~5μm and 8~12μm respectively.The spatial resolution of the middle-wavelength infrared spectrum is better than 5 m,and the spatial resolution of the long-wavelength infrared spectrum is better than 10 m,swatch is greater than 20 km,and the NETD is better than 60 mK.The technical parameters are optimized depend on NETD and modulation transfer function(MTF).The matching theory of cold shield on re-imaging coaxial three-mirror optical system is analyzed.Then the initial configuration parameters are calculated.Finally two dual-band infrared re-imaging off-axis three-mirror optical systems due to matching form of cold shield are designed.The matching result is estimated.