Share Email Print

Proceedings Paper

Modern control for the secondary mirror of a Giant Segmented Mirror Telescope
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To achieve diffraction-limited seeing with the next generation of giant telescopes will require a multi-tiered approach employing both active and adaptive optics. Before removing atmospheric effects via adaptive optics, the telescope structure must be actively controlled to remove structural dynamics effects from the optical wavefront. While low frequency thermal and gravitational effects may be removed by the primary mirror control system, a more difficult challenge is the higher frequency, wind-induced vibrations of the telescope structure. This paper will address the control system design for the rigid secondary mirror support structure using modern control methods. Multivariable control methods are motivated by the large number of coupled structural modes that contribute to the wavefront error at the secondary mirror. H2 methods are applied to the secondary mirror control system in order to validate the design approach for achieving nominal performance at the system level. The approach investigated for this paper involves using wavefront information to remove wavefront error at the secondary mirror. This work will serve as a basis for demonstrating the feasibility of the overall control architecture for the GSMT point design study.

Paper Details

Date Published: 30 January 2003
PDF: 11 pages
Proc. SPIE 4840, Future Giant Telescopes, (30 January 2003); doi: 10.1117/12.458195
Show Author Affiliations
Mark S. Whorton, NASA Marshall Space Flight Ctr. and Tennessee State Univ. (United States)
George Z. Angeli, AURA Inc. (United States)

Published in SPIE Proceedings Vol. 4840:
Future Giant Telescopes
J. Roger P. Angel; Roberto Gilmozzi, Editor(s)

© SPIE. Terms of Use
Back to Top