22 May 2015 Correction of active space telescope mirror using woofer-tweeter adaptive optics
Author Affiliations +
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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew R. Allen, Matthew R. Allen, Jae Jun Kim, Jae Jun Kim, Brij N. Agrawal, Brij N. Agrawal, } "Correction of active space telescope mirror using woofer-tweeter adaptive optics", Proc. SPIE 9469, Sensors and Systems for Space Applications VIII, 946902 (22 May 2015); doi: 10.1117/12.2176311; https://doi.org/10.1117/12.2176311
PROCEEDINGS
10 PAGES


SHARE
Back to Top