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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。
In order to improve the working standard precision of light radiation and meet the need of high precision radiometric calibration of remote sensor, a research on the standard irradiance of the standard lamp using the low temperature radiometer as the primary standard and the filter radiometer as the delivery standard was carried out. Through the system-level calibration of the filter radiometer response, the physical model of the irradiance standard lamp and the recursive iterative optimization algorithm, the continuous spectral distribution of the irradiance standard lamp is obtained from the integral response under the filter bandwidth. System-level calibration avoids the uncertainty introduced by filter transmissivity, geometric factor measurement, and inconsistencies in calibration conditions. The preliminary results show that the relative difference between the spectral irradiance of 400 ~ 900 nm wavelength band and the result of high temperature blackbody calibration based on ITS-90 is within the uncertainty range of the latter. At home, it is of great significance to try to achieve the standard transmission of standard lamp spectral irradiance based on the low-temperature radiometer, which is of great significance to improve the measurement of optical radiation, radiation temperature measurement and the radiation calibration accuracy of remote sensors, especially hyperspectral remote sensors.