红外高光谱成像仪的系统测试标定与飞行验证

摘要

红外谱段是高光谱遥感中非常有用的波段,由于红外波段的能量小、焦平面探测器研制难、红外背景辐射大等原因,红外谱段的高光谱成像系统并不常见,目前仍然处于仪器发展阶段.本文介绍了一台机载热红外高光谱成像仪,它在8.0～12.5 μ,m的光谱范围内可得到180个波段的光谱信息,光谱分辨率优于44 nm,光谱定标精度优于1 nm.仪器观测总视场14°,空间分辨率优于1 mrad,噪声等效温差优于0.2 K@300 K(平均).仪器于2015年5月开展了实验室辐射标定和光谱标定,并于2015年6月在中国浙江舟山开展了飞行试验,获取了指定区域的红外高光谱图像,处理结果表明红外高光谱数据立方体可以有效地反演地表温度和地表辐射率,反演的发射率曲线可以用于地物识别.%Infrared spectrum is very useful in the field of hyperspectral remote sensing.Because of the weak energy of infrared spectrum,the difficulty of the development of infrared focal plane,and the strong background,the development of the Infrared Hyperspectral Imaging System is very difficult.So far,the field is still in the laboratory research stage.This paper presents an airborne infrared hyperspectral imager.It can acquires 180 wavebands in the range of 8.0 ～ 12.5 μm.The spectral resolution of this imager is better than 44 nm and the absolute spectral calibration accuracy is better than 1 nm.The field of view of this imager is about 14° and the spatial resolution is better than lmrad.Its noise equivalent temperature difference (NETD) is less than 0.2 K@300 K.The imager was carried out in Zhoushan,Zhejiang,China in June 2015.Analysis shows that the infrared hyperspectral image data can plays an important role in the field of surface emissivity inversion and geological mineral recognition.