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Proceedings Paper

Design Aspects Of The University Of Texas 7.6M Telescope - Part II
Author(s): Frank B. Ray
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Paper Abstract

To help gain an engineering overview of the efficacy of a low bandwidth figure control or "tuning" system, the Aerospace Corporation, during a review of the 7.6m telescope design, produced a short 16mm film of a simulation designed by Dr. R. Hefner of Aerospace. In this design, the mirror is derived from a blank proposed by the Corning Glass Works, only 5 inches thick, of ULE material. An oscillating point load is placed at a point near the edge of the mirror, half-way between two of the collimating points. Two stages of control are depicted, in quasi-real time, with a clock display inculded. The first is rate damping at the 14 controlled points. The second is based on direct output feed-back of position information derived from the controlled points. A point spread function displays the energy concentration improvement gained by utilizing such figure control methods. Although rate damping can give a measure of improvement, it is clear from this single point case that to obviate the effects of all potentially degrading external forces, direct output feedback is the more desirable approach.

Paper Details

Date Published: 22 October 1985
PDF: 1 pages
Proc. SPIE 0542, Optical Fabrication & Testing Workshop, (22 October 1985); doi: 10.1117/12.948160
Show Author Affiliations
Frank B. Ray, University of Texas McDonald Observatory (United States)

Published in SPIE Proceedings Vol. 0542:
Optical Fabrication & Testing Workshop
Robin S. McDowell, Editor(s)

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