Li Zhigang, Wang Xiaoxu, Zheng Yuquan, Li Futian
Appl Opt. 2017 Jun 10;56(17):5073-5079. doi: 10.1364/AO.56.005073.
High-accuracy absolute detector-based spectroradiometric calibration techniques traceable to cryogenic absolute radiometers have made progress rapidly in recent decades under the impetus of atmospheric quantitative spectral remote sensing. A high brightness spectrally tunable radiant source using a supercontinuum fiber laser and a digital micromirror device (DMD) has been developed to meet demands of spectroradiometric calibrations for ground-based, aeronautics-based, and aerospace-based remote sensing instruments and spectral simulations of natural scenes such as the sun and atmosphere. Using a supercontinuum fiber laser as a radiant source, the spectral radiance of the spectrally tunable radiant source is 20 times higher than the spectrally tunable radiant source using conventional radiant sources such as tungsten halogen lamps, xenon lamps, or LED lamps, and the stability is better than ±0.3%/h. Using a DMD, the spectrally tunable radiant source possesses two working modes. In narrow-band modes, it is calibrated by an absolute detector, and in broad-band modes, it can calibrate for remote sensing instrument. The uncertainty of the spectral radiance of the spectrally tunable radiant source is estimated at less than 1.87% at 350 nm to 0.85% at 750 nm, and compared to only standard lamp-based calibration, a greater improvement is gained.
在大气定量光谱遥感的推动下，近几十年来，可追溯至低温绝对辐射计的高精度基于绝对探测器的光谱辐射校准技术取得了迅速进展。为满足地基、航空和航天遥感仪器的光谱辐射校准以及太阳和大气等自然场景的光谱模拟需求，已开发出一种使用超连续光纤激光器和数字微镜器件（DMD）的高亮度光谱可调辐射源。以超连续光纤激光器作为辐射源，该光谱可调辐射源的光谱辐射亮度比使用卤钨灯、氙灯或发光二极管灯等传统辐射源的光谱可调辐射源高20倍，且稳定性优于±0.3%/小时。通过使用数字微镜器件，该光谱可调辐射源具有两种工作模式。在窄带模式下，它由绝对探测器进行校准，在宽带模式下，它可用于校准遥感仪器。该光谱可调辐射源的光谱辐射亮度不确定度估计在350纳米处小于1.87%，在750纳米处为0.85%，与仅基于标准灯的校准相比有了更大的改进。
