Design of a Compact Transfer Radiometer for a Radiometric Benchmark Transfer Chain

• Published in: Sensors (Basel, Switzerland) Switzerland), 2022-09, Vol.22 (18), p.6795
• Main Authors: Lei, Kaichao, Ye, Xin, Xia, Zhiwei, Xu, Nan, Li, Shuqi, Zhang, Yachao, Wang, Yuwei, Liu, Zhiwei, Li, Zhigang
• Format: Article
• Language: English
• Subjects: Accuracy; Artificial satellites in remote sensing; Benchmarks; Calibration; Chains; Climate change; cryogenic radiometer; Imaging spectrometers; Measurement; Methods; Radiance; Radiation; Radiometers; Radiometry; Remote sensing; Technical services; transfer radiometer; Uncertainty
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s22186795

In order to meet the high-accuracy calibration requirements of satellite remote sensing instruments, a transfer radiometer for an on-orbit radiometric benchmark transfer chain has been developed, which provides vital technical support for realizing the radiometric calibration uncertainty of the order of 10−3 for remote sensing instruments. The primary role of the transfer radiometer is to convert from the spectral power responsivity traceable to a cryogenic radiometer to the spectral radiance responsivity and transfer it to the imaging spectrometer. At a wavelength of 852.1 nm, the combined uncertainty of the radiance measurement comparison experiment between the transfer radiometer and a radiance meter is 0.43% (k = 1), and the relative deviation of the measurements between the transfer radiometer and the radiance meter is better than 0.36%, which is better than the combined uncertainty of the radiance measurement comparison experiment. This demonstrates that the transfer radiometer can achieve radiance measurements with a measurement uncertainty better than 0.3% (k = 1).