The Solar Irradiance Monitors Than The Right And Correction

Solar Total Irradiance Monitor (STIM) is a remote sensor on the FengYun-3 satellite. The STIM is used to measure the solar irradiance. The STIM is made up of three same absolute radiometers, which mount according to a certain angle each other. The STIM measures solar irradiance on the satellite without sun-tracking system. Solar irradiance is measured when the sun scans over the field of each absolute radiometer respectively.The paper researches comparison and calibration of the STIM. The formula corrected coefficient of STIM is introduced.Three absolute radiometers compare with the Solar Irradiance Absolute Radiometer (SIAR-1) respectively on ground , and calculate the corrected coefficient of three absolute radiometers relativity to WRR respectively. Seven calibrated factors are introduced, and the formula of every calibrated factor is showed, which according to the principle and the work in fact of STIM. It can truly calculate corrected coefficient of every calibrated factor by formula.The paper emphasizly researches response functions of absolute radiometers, and the method of variational angle measure is corrected. The paper analyzes the function of an angle of incidence and the area in which absolute radiometers absorb the solar irradiance under considering the characteristic and principle of absolute radiometers. The function of absolute radiometers temperature raise and time is discussed, and the curve of the function is drawed by computer. It can educe the max of temperature raise from the curve. Furthermore the numerical value is small than the max of temperature raise absolute radiometers measure the solar irradiance with sun-tracking. So the method of variational angle measure must be corrected, and calculate corrected coefficient of it.