Modelling of white paints optical degradation using Mie's theory and Monte Carlo method

Details Modelling of white paints optical degradation using Mie's theory and Monte Carlo method Modelling of white paints optical degradation using Mie's theory and Monte Carlo method

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..399d&link_type=abstract

In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla

Computer Science

Space Environment, Materials, Modelling

Scientific paper

During long term missions, white paints, used as thermal control coatings on satellites, are severely damaged by the effect of space environment. Reflectance spectra, showing broad absorption bands, are characteristic of the coatings optical degradation. In this paper, a numerical model simulating optical degradation of white paints is presented. This model uses Mie's theory, coupled with a random walk Monte Carlo procedure. With materials like white paints, we are faced to several major difficulties: high pigment charging rate, binder absorption, etc.. The problem is even worse in the case of irradiated paints. In parallel with the description of the basis of the model, we will make an overview of the encountered problems. Simulation results are presented and discussed, in the case of zinc oxide/PDMS type white paints, irradiated by 45 keV protons, in accordance with geostationary orbit environment conditions. The effects of the optical properties of the pigment, the pigment volume concentration, the absorption by the binder on hemispherical reflectance are examined. Comparisons are made with experimental results, and the interest of such a numerical code for the study of high charged materials degradation is discussed.

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