短波红外成像光谱仪的景物辐射采集特性  

Scenery Radiation Acquisition Features of Short-Wave Infrared Imaging Spectrometer

作　　者：梁爽[1,2] 安志勇[1] 冯玉涛[2] 于秋水[1] 

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学学报》2010年第5期1304-1307,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60538020)资助课题

摘　　要：为了研究棱镜色散的非线性对短波红外（1.0-2.5μm）成像光谱仪采集景物辐射能量和信噪比（SNR）的影响,首先推导出系统采集辐射能量和光谱采样计算表达式,并在短波红外光谱范围内进行了计算分析。结果表明,在相同的光谱通道数前提下,与等间隔光谱采样方法相比,单棱镜色散成像光谱仪探测器像元采集到的景物辐射能量,在1.0-1.85μm光谱范围比较高,在1.85-2.5μm光谱范围比较低,信噪比具有类似的特点;随着光谱采样通道数的增加,大气的弱吸收特征越来越明显地表现出来。In order to study the effect on scenery radiation energy acquisition and signal-to-noise ratio of short-wave infrared（1.0-2.5 μm） imaging spectrometer caused by prism nonlinear dispersion,the expressions of radiation energy collection and spectrum sampling calculation are deduced,which are calculated and analyzed in the range of short-wave infrared spectrum.It is indicated that when the number of spectral channels is same,compared to equal interval spectral sampling method,the scenery radiation energy collected by a single prism dispersive imaging spectrometer detector is relatively higher in the 1.0~1.85 μm range,but it is relatively lower in the 1.85~2.5 μm range,and the signal-to-noise ratio has similar characteristics.The weak absorption feature of atmosphere is more and more clearly apparent,when the number of spectral sampling channels increases.

关 键 词：成像光谱仪 棱镜色散 辐射能量采集 信噪比 短波红外谱段 

分 类 号：TN214[电子电信—物理电子学] TH744.1[机械工程—光学工程]