18 August 1998 Easily performed method of solar total irradiance measurement in space
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Abstract
For usual solar total irradiance monitor, the absolute radiometer is mounted on a sun auto tracking system. This paper introduces a new method of measuring solar total irradiance on Heliosynchronous Polar-Orbit Satellite. The solar total irradiance monitor is made up of the three same absolute radiometers with ±7.5° field-of-view which are mounted onto one section plane. Because the angle between the orbit plane and solar meridian plane is stationary for sun-synchronous polar-orbit satellite, the three radiometers are mounted on the plane which is parallel to the solar meridian plane. When the satellite runs in orbit, measurement will be taken at the overhead time when the sunscans over the three radiometers' field of view respectively. The three absolute radiometers are cavity electrically-calibrated absolute radiometers with measurements precision and uncertainty of less than 0.05 percent and 0.2 percent, respectively. In our method, since the variation of primary aperture area with angel is different from that of tracking mode, we use a simplified model in which the area variation with angle is expressed by cosine function. Formulae and curves obtained by differential equation of thermodynamics of the simplified mode in non-tracking model are similar with that in the sun- tracking mode. The theoretical analysis and simulation calculation proved the precision by our method could reach the same level as that of the sun-tracking mode, but the construction of instrument is much simple.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei Fang, Wei Fang, BingXi Yu, BingXi Yu, } "Easily performed method of solar total irradiance measurement in space", Proc. SPIE 3501, Optical Remote Sensing of the Atmosphere and Clouds, (18 August 1998); doi: 10.1117/12.317739; https://doi.org/10.1117/12.317739
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