Opto-mechanical design and performance test of infrared channel field radiometer

In order to meet the needs of on-orbit radiometric calibration of remote sensors, an infrared channel field radiometer (ICFR) was developed for on-site measurement. The working principle, optical system design and mechanical structure design of ICFR were expounded, and the radiometric calibration and calibration uncertainty analysis of ICFR laboratory were carried out, the results showed that the received radiance of each ICFR channel had a high linear relationship with the response DN value, and the radiometric calibration uncertainty was better than 0.16 K. The ICFR thermal shock resistance and working environment temperature adaptability tests were carried out. The results showed that ICFR had strong thermal shock resistance and could be applied to the working environment of −20-50 ℃. In order to verify the accuracy of ICFR measurement data and the reliability of the instrument, the field comparison experiment of ICFR and CE312 were carried out in the National High-Resolution Remote Sensing Comprehensive Calibration Field. The results showed that the surface brightness temperature measured by the two devices had the same change trend, the average brightness temperature deviation measured by the corresponding channels of the two was less than 0.1 K, and the standard deviation was less than 0.3 K, which verified that ICFR had measurement accuracy and stability similar to CE312, and had important applications in remote sensor thermal infrared band site calibration.