Abstract

An analytical procedure has been developed to predict the solar array (S/A) performance variation caused by the combined effects of surface particle light obscuration/scattering and radiation loss through a multilayered substrate. In this analysis, the S/A particulate contamination solution involves determining two light propagation quantities: the bidirectional transmittance distribution function (BTDF) due to surface particle and the Fresnel coefficients for the S/A surface. The results show that for a severe case where the particle obscuration on the solar cell surfaces is 5.99 percent (equivalent cleanliness level of 940 per MIL-STD-1246B), the net power loss is predicted to be 4.0 percent. Comparisons of the predicted power loss to solar cell samples exposed to particle fallout show good agreements. 11 refs.

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