FABRICATION OF AN IR TELESCOPE FOR A BALLOON-BORNE SPACE MISSION

摘要

The NASA Balloon Experimental Twin Telescope for Infrared Interferometer (BETTII), shown in FIGURE 1, consists of two identical telescopes mounted onto a space frame and carried to an altitude of 40 km by a balloon [1]. Each telescope has four optical elements - a primary mirror, a turning flat, a secondary mirror, and a tertiary mirror.