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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 influence of prism dispersion nonlinearity on radiant energy and signal-to-noise ratio (SNR) of shortwave infrared (1.0 ~ 2.5μm) imaging spectrometer, the formula of radiant energy and spectral sampling was deduced firstly, Spectral analysis was carried out within the spectral range. The results show that compared with the equal-interval spectral sampling method, the radiation energy of the scene collected by the detector element of the single-prism dispersive imaging spectrometer is relatively high in the spectral range of 1.0-1.85μm, 2.5μm spectral range is relatively low, the signal to noise ratio has a similar characteristic; with the increase of the number of spectral sampling channels, the atmospheric weak absorption features more and more obvious.