Physics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988infph..28..243d&link_type=abstract
Infrared Physics (ISSN 0020-0891), vol. 28, July 1988, p. 243-248. CNR-supported research.
Physics
3
Balloon-Borne Instruments, Infrared Telescopes, Mirrors, Temperature Gradients, Anisotropy, Conductive Heat Transfer, Line Of Sight, Reflection, Relic Radiation
Scientific paper
Experimental results on the presence of thermal gradients on the surface of the aluminum primary mirror of a 620-mm balloon-borne Cassegrain telescope are presented. Balloon results were obtained on July 29, 1987 during the ARGO 87 experiment. A ray tracing program was develped to study the primary mirror enlightment, taking into account reflections and shadowing by the shield. It is suggested that a careful shield design is necessary for day-time operation, and that the line of sight must be kept at distances larger than 90 deg from the sun. Furthermore, night-time operation may be feasible at the level required by cosmic-background-radiation anisotropy measurements using a simple shield configuration.
de Bernardis Paolo
de Petris Marco
Epifani M.
Gervasi Massimo
Guarini Gianfranco
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