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Proceedings Paper

Correction of active space telescope mirror using woofer-tweeter adaptive optics
Author(s): Matthew R. Allen; Jae Jun Kim; Brij N. Agrawal
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Paper Abstract

Future large aperture space telescopes may use lightweight correctable active mirrors. The Naval Postgraduate School’s Segmented Mirror Telescope (SMT) test bed uses 1-meter silicon carbide (SiC) active mirror segments to form a sixsegment deployable 3-meter telescope. The active segments suffer from residual surface errors after a correction is applied. A deformable mirror is added at the SMT pupil plane to improve this residual error. The large active SMT segment represents the woofer, and a small continuous micro-electro-mechanical system (MEMS) deformable mirror represents the tweeter. A global influence matrix and closed loop constrained least squares controller command the active segment and additional deformable mirror as a single device. An interferometer measures the surface error and provides feedback to the controller. Simulation and experimental results demonstrate a significant improvement in wavefront error compared to a 2-step sequential woofer-tweeter constrained least squares control approach.

Paper Details

Date Published: 22 May 2015
PDF: 10 pages
Proc. SPIE 9469, Sensors and Systems for Space Applications VIII, 946902 (22 May 2015); doi: 10.1117/12.2176311
Show Author Affiliations
Matthew R. Allen, Naval Postgraduate School (United States)
Jae Jun Kim, Naval Postgraduate School (United States)
Brij N. Agrawal, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 9469:
Sensors and Systems for Space Applications VIII
Khanh D. Pham; Genshe Chen, Editor(s)

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