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Experimental and Flight Determination of the Solar Absorptance for an OSR Radiator as a Function of Incidence Angle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 14, 1986 by SAE International in United States
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An INTELSAT-funded experiment to determine the solar absorptance of optical solar reflectors (OSRs) as a function of incidence angle has confirmed the initial findings from flight data reduction on the COMSAT COMSTAR Beacon experiments. The OSR solar absorptance is shown to increase with increasing sun incidence angle. The magnitude of the increase for a body-stabilized spacecraft in geosynchronous orbit during peak solar illumination and a 66.5° incidence angle is 20 percent larger than the value normally derived from spectrophotometer measurements. These results help to explain the increases in spacecraft temperature and OSR degradation observed on many spacecraft immediately after launch which heretofore have been attributed to outgassing effects.
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CitationKelly, W. and Reisenweber, J., "Experimental and Flight Determination of the Solar Absorptance for an OSR Radiator as a Function of Incidence Angle," SAE Technical Paper 860978, 1986, https://doi.org/10.4271/860978.
- Spencer A. L. et al., “INTELSAT VI Thermal Design, Testing and Flight Performance,” AIAA and ASME Third Joint Thermophysics, Fluids, Plasma, and Heat Transfer Conference, St. Louis, Missouri, June 1982, AIAA Paper 82-0863.
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- Stultz, J. W. “Solar Absorptance of Second Surface Mirrors for High Incidence,” paper presented at the AIAA and ASME Thermophysics and Heat Transfer Conference, Boston, Massachusetts, July 1984, AIAA paper 74-0670.
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- Kelly W. H. and Reiseaweber, J. H. “Experimental Measurement of Solar Absorptance of an INTELSAT VI OSR Radiator as a Function of Incidence Angle,” COMSAT Technical Review, Vol. 15, No. 2A, Fall 1985, pp. 260-274.
- Private communication.