【摘要】 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。更多还原

【Abstract】 The effect of the nonlinear property of prism dispersion on the radiance measurement characteristics of an imaging spectrometer was analyzed in VNIR.The spectral radiance acquired by an imaging spectrometer with a single prism is lower than that with equal interval spectral sampling in 0.4～0.6 μm spectral range and higher in 0.6～1.0 μm spectral range.For an imaging spectrometer with composite prism,the measured radiance is uniform in the full spectral range.With increasing the number of spectral bands,the weak absorbing profiles of atmosphere are exhibited more and more obviously.更多还原