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棱镜色散成像光谱仪对景物光谱的采样不是等间隔的。为了研究非线性色散对成像光谱仪采集景物辐射能量的影响,首先推导出相应的计算表达式,据此,在可见近红外光谱范围内(VNIR)分析了以单棱镜或复合棱镜为色散元件时成像光谱仪辐射能量采集特性。结果表明:与等间隔光谱采样相比,对于采用单棱镜作为色散元件的成像光谱仪而言,探测器像元采集到的景物辐射能量在光谱范围的短波(0.4～0.6μm)部分较低,在中长波(0.6～1.0μm)部分较高;对于采用复合棱镜作为色散元件的成像光谱仪而言,探测器像元采集到的景物辐射能量在整个光谱范围都比较均衡;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。
Prism dispersion imaging spectrometer sampling of the scene spectrum is not equidistant. In order to study the influence of nonlinear dispersion on the radiant energy of imaging scene acquired by imaging spectrometer, a corresponding calculation expression is deduced firstly. Based on this, the VNIR analysis of single-prism or compound prism as dispersive element imaging Spectrometer radiation energy acquisition characteristics. The results show that for the imaging spectrometer with single prism as the dispersive element, compared with the equal-interval spectral sampling, the radiation energy of the scene collected by the detector pixel is lower in the short wavelength (0.4-0.6 μm) part of the spectral range. For the imaging spectrometer with composite prism as the dispersive element, the radiation energy of the scene collected by the detector pixel is relatively balanced over the entire spectral range. As the number of spectral sampling channels Increasing, the weak absorption characteristics of the atmosphere show more and more clearly.