机载红外推扫成像光谱仪光学设计  

Optical design of airborne infrared pushbroom imaging spectrometer

作　　者：刘子寒[1,2] 季轶群[1,2] 石荣宝[1,2] 陈宇恒[1,2] 沈为民[1,2] 

机构地区：[1]苏州大学现代光学技术研究所,江苏苏州215006 [2]江苏省现代光学技术重点实验室,江苏苏州215006

出　　处：《红外与激光工程》2014年第9期2941-2946,共6页Infrared and Laser Engineering

基　　金：民用高分辨率对地观测系统专项重大科技工程(高分专项)项目(52-H33A01-8358-12/12)

摘　　要：红外成像光谱仪适用于火山活动探测、森林火灾监测、城市化影响分析、地球表面研究及军事伪装识别等方面。文中基于Dyson中继系统，设计使用波长范围为7.5~10μm的长波红外成像光谱仪，采用凹面衍射光栅分光，系统F数达到1.2，视场角18°，空间分辨率为1 mrad，光谱分辨率为50 nm，NETD小于0.3 K,调制传递函数接近衍射极限，光学系统体积为72 mm×39 mm×39 mm。该系统具有集光本领强、固有像差小、结构紧凑等优点。对其杂散热辐射分析表明，采用实入瞳作为冷光栏和整体制冷的方法，能有效地抑制光机系统自身的热辐射。Infrared imaging spectrometers are applied to volcano behavior detection, forest fire survey, urbanization effect analysis, terrestrial composition and change monitoring, and camouflage recognition. In this paper, based on Dyson relay, a long wave infrared imaging spectrometer with wavelength range of 7.5 to 10μm was designed, which used a concave diffraction grating as its dispersive element. Its F number reached 1.2, field angle of view was 18＆#176; and spatial pixel resolution was 1 mrad, spectral resolution was 50 nm and noise equivalent temperature difference （NETD） was less than 0.3 K. The size of this designed optical system was about 72 mm ×39 mm ×39 mm, and its modulation transfer function approached to diffraction limitation. It has advantages of high throughput, low inherent aberration, and compactness. Analysis of its stray thermal radiation shows that its own thermal radiation of optical-mechanical system can be effectively suppressed by use of real entrance pupil as cool stop and of cryogenic optics.

关 键 词：成像光谱仪 同心系统 凹面光栅 光学设计 

分 类 号：TN216[电子电信—物理电子学]