Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ryso.rept.....d&link_type=abstract
"Retroreflector YO3: Study of the optical properties of protected mirrors Transl. into ENGLISH of "Retroreflecteur Y03: Etude d
Physics
Laser Range Finders, Lunar Retroreflectors, Optical Reflection, Telemetry, Thermal Control Coatings, Yttrium Oxides, Aluminum Coatings, Dielectrics, Silica Glass, Surface Finishing
Scientific paper
The influence of a dielectric deposit (silica or alumina) on the reflective power of the mirrors which make up a trihedron was analyzed. This deposit, between 2 and 6 microns thick, ensures thermal protection of the retroreflector in the lunar environment. A reflective power of 85% per mirror is specified for an aluminum reflective coating. The analysis shows that deposit thickness must be controlled to within limits which ensure that the interferences do not lead to losses of more than 5%. If feasibility tests result in reflective powers 85%, interferential layers can be used to raise the reflection of the aluminum from 90% to 96%. The thick silica deposit intended for thermal protection is applied on top of this treatment. However, this solution makes the mirror very selective, and could prejudice thermal qualities.
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