Prof. Yunxian Huang Profile

Prof. Yunxian Huang

at NUDT

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Proceedings Article | 12 March 2021 Paper

Radiometric calibration of low light imager based on specialized light sources

Shuo Ma, Shensen Hu, Yunxian Huang, Wei Yan

Proceedings Volume 11763, 1176323 (2021) https://doi.org/10.1117/12.2586321

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Due to the advances in the low light imagers and high quality of the related night time data products, some related applications such as fishery activities, fog detection, gravity wave and internal solitary wave parameters retrieval, armed conflicts and disasters have been greatly promoted. However, the indirect radiometric calibration at night brings some uncertainties. Thus, the directly radiometric calibration of low light imagers is urgent and important to produce high quality data products. As the relatively stable light emissions may also be obtained by the low-level light imager at night, the calibration method of low-level light imager based on self-design light source are provided. a low-light calibration light source based on the integrating sphere which has good radiance uniformity and stable emission radiation was designed and developed to further improve the calibration accuracy. Based on the test and analysis of its radiative characteristics in the laboratory, the low-light calibration experiment based on the integrated sphere light source is performed in the Dunhuang site. The results show that the observations are consistence with the simulations, which means that the self-design light source is a good way to calibrate the low light imager. As the new generation of space borne low light sensors own higher spatial resolution and multispectral camera covering the range from blue to NIR, some calibration problems of the further low light sensors are also discussed.

Proceedings Article | 8 March 2017 Paper

Using two different targets for the calibration of S-NPP VIIRS day night band under lunar illumination

Shensen Hu, Shuo Ma, Wei Yan, Yunxian Huang

Proceedings Volume 10255, 102552O (2017) https://doi.org/10.1117/12.2263852

KEYWORDS: Calibration, Atmospheric modeling, Clouds, Aerosols, Reflectivity, Radiative transfer, Atmospheric particles, Visible radiation, Satellites, Data modeling

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The Day Night Band (DNB), mounted on the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the Suomi National Polar-orbiting Partnership (NPP), has the unique ability to image cloud and surface features with reflected moonlight and nonlunar nighttime illumination sources. However, the radiometric calibration is too difficult to be calculated directly at night due to extremely low radiance. The Dome C in Antarctic and Railroad Valley Playa in Nevada are utilized to calibrate the DNB High Gain Stage (HGS) at night due to their invariable surface properties. The mean value of the relative errors based on Dome C site is -7.41% and RVP is -4.14%. The results suggest that there is an average bias in the DNB HGS on-orbit calibration and an unobvious trend exists due to the changing relative spectral responses over time.

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