Correction of a space telescope active primary mirror using adaptive optics in a woofer-tweeter configuration
Allen, Matthew R.
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The Department of Defense seeks to improve space-based imaging capabilities by building larger space telescopes designed for higher orbits in order to provide timely accurate imagery to the military and national decision makers. Satellites have mass and volume constraints due to the limited size of the launch vehicle. Larger aperture imagery satellites require lightweight deployable segmented primary mirrors to meet mass and volume constraints. Lightweight segmented mirrors exist but lack the structure and mass necessary for high-quality optical performance. This research investigates using a deformable mirror with a large lightweight active primary mirror to improve optical performance. Control techniques are applied to simultaneously manipulate an active primary mirror segment and deformable mirror in a woofer-tweeter configuration. Computer simulations and experiments using woofer-tweeter control techniques show reduction of residual wavefront error attributed to the primary mirror. A woofer-tweeter gradient control technique was shown to experimentally reduce wavefront error by 24% using the Naval Postgraduate School’s 3-m diameter segmented mirror telescope test bed. The addition of a deformable mirror to an active space telescope in a woofer-tweeter configuration is a technically feasible option for a large-aperture telescope design, and can reduce primary mirror requirements potentially reducing cost.
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Watson, James J. (Monterey, California: Naval Postgraduate School, 2013-12);A deformable mirror is proposed as a solution to correct aberrations on a satellite primary mirror surface. The deformable mirror is used in a double-pass configuration with an interferometer and a mirror segment on the ...
Allen, Matthew R. (Monterey, California. Naval Postgraduate School, 2007-12);Future long dwell high resolution imagery satellites and space telescopes will require very large flexible primary mirrors. These large mirrors face many challenges including optical surface imperfections, structural ...
Mueller, Mark C. (Monterey, California: Naval Postgraduate School, 2016-12);Adaptive optics offer the potential to reduce the high cost and long lead time associated with manufacturing mirrors for spaced-based telescopes by allowing lighter materials to be substituted. These lighter materials lack ...