1994-06-01

The Qualification Testing of Two Solar Reflectors 941516

A number of tests have been performed on two coatings having relatively low αs/ε ratios in order to qualify them for use on the Coronal Diagnostic Spectrometer (CDS). The coatings tested were (i) a 4 μm layer of SiOx on a hand polished aluminium alloy substrate, and (ii) a white Plasmocer [1] coating on an aluminium alloy substrate. The tests performed included the measurement of thermo-optical properties, an evaluation of minimum adhesive strength, the effects of thermal cycling in vacuum and proton bombardment, and resistance to cleaning processes.All the evidence obtained during the investigation indicated that both coatings were acceptable for flight on CDS and perhaps other contamination-sensitive instruments where traditional solar reflectors, e.g. silverized Teflon or white paint, are not acceptable due to the large quantities of adhesive required to ensure good thermal contact in the case of the former or the presence of organic molecules and particulates in the case of the latter.

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