利用基于超连续激光和单色仪(SCM)的细分光谱扫描定标装置,对传感器的绝对光谱辐亮度响应度进行定标。利用两种绝对功率响应度溯源于低温绝对辐射计的辐亮度探测器(Trap-A 和Trap-B),分别以通用的部件级定标方式和基于该定标装置的系统级定标方式(以Trap-A作为参考),确定了Trap-B的绝对光谱辐亮度响应度,两种方式下的定标不确定度分别优于0.46%和1.8%。两种定标结果具有较好的一致性,在450~900 nm波段范围内,相对差异小于0.9%。研究结果表明:基于SCM的细分光谱扫描定标装置适用于传感器的绝对光谱辐射定标,在遥感器的绝对光谱辐射定标方面具有重要的应用价值。

A spectrally resolved scanning calibration facility based on a supercontinuum laser and monochromator (SCM) was proposed for the calibration of the absolute spectral radiance responsivity of the sensors. Two radiance meters, labeled Traps-A and Traps-B, were used herein. The absolute spectral power responsivities of the meters were traced to a cryogenic absolute radiometer. The absolute spectral radiance responsivity of Trap-B was obtained by a general unit-level calibration method, and a system-level calibration method based on the SCM with Trap-A taken as the reference. The calibration uncertainties of Traps-A and Traps-B were lower than 0.46% and 1.8%, respectively. The calibration results by the two methods were in good agreement, with a relative difference of less than 0.9% in the 450-900 nm. The results imply that a spectrally-resolved scanning calibration facility based on SCM is suitable for the absolute spectral radiometric calibration of sensors and highly applicable to the absolute spectral radiometric calibration of remote sensors.