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

Daniel R. Coulter; Steven A. Macenka; Mark T. Stier; Roger A. Paquin

doi:10.1117/12.279810

28 July 1997 ITTT: a state-of-the-art ultralightweight all-Be telescope

Daniel R. Coulter, Steven A. Macenka, Mark T. Stier, Roger A. Paquin

Proceedings Volume 10289, Advanced Materials for Optics and Precision Structures: A Critical Review; 102890I (1997) https://doi.org/10.1117/12.279810
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The Infrared Technology Testbed Telescope (1T1T) 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 pm, 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.

Citation Download Citation

Daniel R. Coulter, Steven A. Macenka, Mark T. Stier, and Roger A. Paquin "ITTT: a state-of-the-art ultralightweight all-Be telescope", Proc. SPIE 10289, Advanced Materials for Optics and Precision Structures: A Critical Review, 102890I (28 July 1997); https://doi.org/10.1117/12.279810

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