Computer Science – Performance
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5877..195h&link_type=abstract
Optomechanics 2005. Edited by Hatheway, Alson E. Proceedings of the SPIE, Volume 5877, pp. 195-203 (2005).
Computer Science
Performance
Scientific paper
Unpolished diamond turned mirrors are common for infrared systems. We report the successful use of unpolished mirrors in a visible spectrum, all aluminum telescope for the planned New Horizons mission to Pluto. The Ralph telescope is an F/8.7 Three Mirror Anastigmat with a 75mm aperture, a 5.7° by 1.0° field of view, and a mass of only 8kg. Key to the performance of the system are a process for reducing the micro-roughness of the off-axis aspheric surfaces to below 60 Ångstroms RMS, and the fabrication of precision diamond turned mounting features on the mirrors and one-piece, thin-walled housing. The telescope achieves nearly diffraction-limited performance with minimal post-assembly alignment, and maintains that performance, including focus, over a wide range about the operating temperature of 210K.
Baer James W.
Comstock Lovell E.
Hardaway M. R. L.
Hegge M. J.
Sabatke Derek S.
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