系统级定标方法实现基于低温辐射计的标准灯400～900nm波段光谱辐照度

400～900 nm Spectral Irradiance of Cryogenic Radiometer-Based Irradiance Standard Lamp Using System Level Calibration Method

为提高光辐射工作标准精度和满足遥感器高精度辐射定标需要,开展了以低温辐射计为初级标准,滤光片辐射计为传递标准的标准灯光谱辐照度实现研究。通过滤光片辐射计响应的系统级定标、辐照度标准灯物理模型和递归迭代优化算法,由滤光片带宽下的积分响应得到辐照度标准灯的连续光谱分布。系统级的定标方法避免了滤光片透射率、几何因子测量和使用与标定状态不一致引入的不确定度。初步结果表明,该方法实现的400～900 nm波段标准灯光谱辐照度与基于国际温标(ITS-90)高温黑体标定的结果相对差别在后者的不确定度范围之内。在国内尝试实现了基于低温辐射计的标准灯光谱辐照度标准传递,对提高光辐射计量、辐射测温以及遥感器特别是高光谱遥感器辐射定标精度有重要意义。

To improve the accuracy of radiation work standards and meet the urgent need of high-accuracy remote sensors calibration,a study about establishment of irradiance of standard lamp with spectrum range from 400 to 900 nm is carried out using the cryogenic radiometer as the primary standard and filter radiometer as the transfer standard.Through with a recursive iterative optimization algorithm,a physical model of the irradiance standard lamp and a filter detector spectral response system level calibration by a laser imported integrating sphere,the continuous spectral distribution of the irradiance standard lamp can be calculated.The method of system level calibration avoids the uncertainty induced by filter transmittance,geometric factor measurement uncertainty and discord between use and calibration states.Preliminary results show that the difference between standard lamp irradiance calibrated by ITS-90 black body and calculated value by the method is within the uncertainty of calibration.The transfer stand of an irradiance standard lamp based on cryogenic radiometer is tried in China.The method could greatly improve the accuracy of current optical radiation work standard.The research has important significance in the optical radiation measurement and remote sensors,especially in hyper-spectral remote sensors calibration.