溯源于低温辐射计的1064nm波段探测器绝对光谱响应度定标

标准传递探测器在红外波段的绝对光谱响应度定标不确定度较大且难以降低,其主要影响因子是窗口透过率的测量不确定度,该项因子是由布儒斯特窗口的状态复现引入。给出了陷阱型标准传递探测器在1 064 nm波段溯源于低温绝对辐射计的定标实验过程和结果。介绍了低温辐射计新型Y型定标光路,该光路消除了低温辐射计窗口反射损耗引入的不确定性。实验测试了探测器在1 064 nm波段的线性、空间响应均匀性、稳定性和空间偏振非敏感性。结果表明:传递探测器绝对光谱响应度定标的不确定度优于0.023%,响应度重复性的实验结果表明了Y型低温辐射计定标光路改造的可行性。

Calibration of absolute spectral responsivity at 1 064 nm of transfer detector against cryogenic radiometer

The significant uncertainty of absolute spectral responsivity of Standard Transfer Detector in infrared band is difficult to solve, the main factor is measure uncertainty of window transmittance, which is introduced by the state reproduction of Brewster Window. The calibration process and results of Standard Transfer Trap Detector against a Cryogenic Radiometer at 1 064 nm were presented. The novel calibration structure, called Y calibration light path, could effectively eliminate the uncertainty caused by the window reflection loss inside the Cryogenic Radiometer. During the process, the linearity, spatial uniformity, polarization sensitivity and stability of the trap detector at 1 064 nm were measured. It is proved that the Standard Transfer Trap Detector shows a good performance with the uncertainty of absolute responsivity less than 0.023%. The repeatability experimental results show that Y calibration light path reconstruction of cryogenic radiometer is feasible.