Journal of Atmospheric and Environmental Optics

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Radiation Response Characteristics of the Ratioing Radiometer

ZOU Peng, LI Congfei, LI Mengfan, LU Meina, SUN Zhen, LI Zhenyang, HONG Jin, SI Xiaolong, QIU Zhenwei   

  1. Key  Laboratory  of  Optical  Calibration  and  Characterization,
     Anhui  Institute  of  Optics  and  Fine  Mechanics,  Chinese  Academy  of  Sciences, Hefei 230031, China
  • Online:2019-01-28 Published:2019-01-29

Abstract: The absolute radiation calibration and long-term stability monitoring of the optical remote sensor can be realized by
the ratioing radiation on-board calibrator, in which the diffuser illuminated by the sun is used as the reference
light source, and the on-orbit degradation of the solar diffuser is corrected by the ratioing radiometer(RRM).
The radiation response characteristics of the RRM is one of the main factors affecting the accuracy of the
on-orbit calibration. The radiation response characteristics of the RRM
 is evaluated. The absolute responsivity is obtained, and the response
nonlinearity and response instability are measured. The results show that the uncertainty of absolute response
calibration is better than 2.88%, the nonlinearity is better than 0.93%, and the instability is better than
0.52%, which satisfies the requirements of on-orbit calibration applications.

Key words: optical remote sensing, on-board calibration, ratioing radiometer, radiation response characteristics

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