ITTT: a state-of-the-art ultralightweight all-Be telescope

Details ITTT: a state-of-the-art ultralightweight all-Be telescope ITTT: a state-of-the-art ultralightweight all-Be telescope

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.cr67..277c&link_type=abstract

Proc. SPIE Vol. CR67, p. 277-296, Advanced Materials for Optics and Precision Structures, Mark A. Ealey; Roger A. Paquin; Thomas

Physics

Optics

Scientific paper

The Infrared Technology Testbed Telescope is a demonstration telescope meeting the needs of the SIRTF mission. It is a Ritchey-Cretien form designed for diffraction limited performance at 6.5 micrometers , at 5.5 K with an 85 cm clear aperture. The mirror and system focal ratios are f/1.2 and f/12 respectively. This paper describes the design and fabrication of the efficient, ultra-lightweight, all- beryllium telescope. The design incorporates a central metering tower and single arch primary mirror to achieve a total telescope mass of less than 30 kg. Cryogenic testing of the primary mirror demonstrates the stability of the I- 70-H (special) Be and the fabrication process. No thermal hysteresis was observed after repeated cycling to 5 K, and cryo-null figuring was utilized to overcome the small thermal instability observed at that temperature.

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