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Proceedings Paper

Surface control techniques for the segmented primary mirror in the large lunar telescope
Author(s): Anthony D. Gleckler; Kent P. Pflibsen; Bobby Lee Ulich; Duane D. Smith
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Paper Abstract

The large lunar telescope is a proposed moon-based telescope which incorporates a sixteen-meter segmented primary mirror. An error budget is developed for the active control system of the primary mirror. A control methodology for the primary mirror is then described which utilizes piston sensors for measuring the relative piston error between adjacent segments as well as a separate sensor which measures the tilt of each segment with respect to the pointing direction of the telescope. A trade study is conducted in which the following types of tilt sensors are examined to determine their applicability to this program: stellar wavefront sensors, such as a Hartmann-Shack or a shearing interferometer; holographic optical elements; interferometers; scanning systems; and some nonoptical systems which electronically measure the relative tilt between adjacent segments. In addition, two independent methods of quantitatively verifying the performance of the telescope using either a phase retrieval algorithm or an image sharpening technique, both of which are based on the quality of a stellar image, are presented.

Paper Details

Date Published: 1 September 1991
PDF: 18 pages
Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991); doi: 10.1117/12.46743
Show Author Affiliations
Anthony D. Gleckler, Kaman Aerospace Corp. (United States)
Kent P. Pflibsen, Kaman Aerospace Corp. (United States)
Bobby Lee Ulich, Kaman Aerospace Corp. (United States)
Duane D. Smith, Kaman Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 1494:
Space Astronomical Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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