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Uniformity correction of radiance responsivity in vacuum infrared calibration for FY-3B/VIRR

  • role： First author第一作者
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

  • Email：wangyang13ji@163.com
  • Introduction：王阳，研究方向为空间遥感仪器定标技术。E-mail： wangyang13ji@163.com
WANG Yang1,  
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

NIU Xinhua1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

    Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

  • Email：zeshcn@126.com
  • Introduction：张锷，研究方向为航天遥感仪器的研制、空间光谱成像技术以及空间光学系统技术等领域。E-mail： zeshcn@126.com
ZHANG E12*,  
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

    University of Chinese Academy of Sciences, Beijing 100049, China

CHEN Shuaishuai13,  
  • Affiliation：

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, National Satellite Meteorological Center, Beijing 100081, China

HU Xiuqing4,  
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

ZHANG Dongdong1,  
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

WANG Xianghua1,  
  • Affiliation：

    Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

XIONG Qianqian1

resumen

In vacuum infrared calibration, factors, such as test contamination and non-uniformity of instrument temperature, cause response changes for scanning radiometer system, resulting in inaccurate calibration coefficients and platinum resistance conversion coefficients for each channel. The non-uniformity of the responsivity is corrected using the stability of the blackbody as a reference source in the constant temperature mode and the responsivity invariance in the single calibration state for the infrared detection system. The transfer algorithm of the consistent response from the internal to external blackbody measurement for the infrared channels is established by the data of variable temperature test for the surface blackbody and on-board blackbody in the infrared calibration. For the prelaunch calibration data of FY-3B visible infrared radiometer (VIRR), the non-uniformity of system responsivity is corrected during the calibration. At the temperature change stage, the uniformity of the correction signal for the surface blackbody between the heating-up and cooling-down stages is better than 0.7 digital number. In the radiance transfer stage, the uniformity of the correction signal for the on-board blackbody is better than 0.3 digital number in the reference condition. The difference between the correction method and other traditional methods in calculating the equivalent blackbody temperature of the on-board blackbody is analyzed. This algorithm ensures the transfer accuracy from the space-based radiance standard to the infrared detection system and on-board blackbody, and the technical support is provided to effectively improve the accuracy of vacuum infrared calibration.

palabra clave

remote sensing;infrared calibration;stability;scanning radiometer;responsivity;uniformity

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