Aperture stop diffraction effect of solar irradiance measurement
To address the current reliance on theoretical calculations for evaluating the diffraction effects of aperture stops in irradiance measurement,an experimental method to detect diaphragm diffraction effects was developed.This aims to correct aperture stop diffraction and enhance total solar irradiance measure-ment accuracy.Utilizing dark-field imaging and Fraunhofer far-field diffraction theory,a detection method was designed and tested.By calibrating detector linearity,correcting background signals,and analyzing dif-fraction image data,a data correction process was established.This process determined the solar absolute radiometer diffraction effect value at the aperture stop's front structure and assessed the experimental uncer-tainty.The experiment found a diffraction effect value of 8.81×10-4 with a total uncertainty of 6.49%.These findings provide a crucial technical foundation for accurately correcting diffraction effects in China's next-generation Fengyun meteorological satellites'solar radiation monitors,enabling precise total solar ir-radiance measurements.
万方数据
维普
