Hyper-spectral imaging spectrometer has high spatial and spectral resolution. Its radiometric calibration needs the knowledge of the sources used with high spectral resolution. In order to satisfy the requirement of source, an on-orbit radiometric calibration method is designed in this paper. This chain is based on the spectral inversion accuracy of the calibration light source. We compile the genetic algorithm progress which is used to optimize the channel design of the transfer radiometer and consider the degradation of the halogen lamp, thus realizing the high accuracy inversion of spectral curve in the whole working time. The experimental results show the average root mean squared error is 0.396%, the maximum root mean squared error is 0.448%, and the relative errors at all wavelengths are within 1% in the spectral range from 500 nm to 900 nm during 100 h operating time. The design lays a foundation for the high accuracy calibration of imaging spectrometer.

We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer (SIAR). The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06% in the midday and 0.275% in the morning and afternoon. The uncertainty level which can be considered negligible for SIAR is also investigated, and it is suggested that the uncertainty level has to be less than 0.02%. Then, combining the requirement of international comparison with these two conclusions, we conclude that the suitable time constant for SIAR is 20 s.

考虑在轨绝对辐射定标基准辐射计(ARCPR)要求其测量太阳总辐照度(TSI)的TSI腔的吸收比优于0.999 9，同时测量不确定度在0.001%以下， 本文提出采用在空间和低温环境下性能优越的圆柱形斜底腔作为标定太阳总辐照度的黑体腔，并对斜底腔吸收比进行了测量与研究。介绍了斜底腔的特性，分析了低温辐射计多使用斜底腔作为黑体腔的原因。阐述了替代法测量腔体吸收比的原理，增加了参考光路用于监测激光功率，以提高测量重复性和准确性。通过测量信号与参考光路信号的比值计算了斜体腔的吸收比，并对测量结果进行了不确定度分析。测试实验显示，斜底腔吸收比为0.999 928±0.000 005， 优于ARCPR对标定黑体腔的要求,验证了将斜底腔作为测量太阳总辐照度的TSI腔的可行性。实验还表明: 计算信号电压与参考电压比值，通过比值计算腔体吸收比的方法可以提高测量结果的不确定度，适用于测量超高吸收比腔体的吸收比。