为了实现成像光谱仪绝对辐射定标,以高稳定均匀光源为基础,结合单色仪、大口径平行光管和标准辐射计,建立了一套绝对辐射定标系统.在绝对辐射定标系统上采用替代法标准辐射计标定出被测成像光谱仪入瞳面上的光谱辐射照度,通过获得被测成像光谱仪各像元的输出信号,计算得到各像元的光谱辐射照度响应度,从而实现成像光谱仪可见到远红外波段范围内的绝对辐射定标.实验验证成像光谱仪绝对辐射定标的不确定度优于5％.%In order to realize absolute radiometric calibration of imaging spectrometer,based on stable source,a dedicated absolute radiometric calibration system was set up combined with monochromator,big caliber collimator and standard radiometer.Using substitute method,spectral irradiance of entrance pupil for measured imaging spectrometer was calibrated using standard radiometer during the calibration firstly,and then output signal of every pixel for measured imaging spectrometer was obtained.So spectral irradiance responsivity of every pixel could be calculated,the absolute radiometric calibration of imaging spectrometer in visible and infrared wavelength range was realized.The result of experiment proves that the uncertainty of absolute radiometric calibration is better than 5％.
展开▼
