2018/07/07 by Gregory Allan, Allan, Gregory, Ewan S. Douglas +22 · 1 citation
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Space Satellite Systems and Control #Spacecraft Design and Technology #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.1807.02649
openalex publication_date 2018/07/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Coronagraphs on future space telescopes will require precise wavefront\ncorrection to detect Earth-like exoplanets near their host stars. High-actuator\ncount microelectromechanical system (MEMS) deformable mirrors provide wavefront\ncontrol with low size, weight, and power. The Deformable Mirror Demonstration\nMission (DeMi) payload will demonstrate a 140 actuator MEMS deformable mirror\n(DM) with SI5.5 micro meter maximum stroke. We present the flight\noptomechanical design, lab tests of the flight wavefront sensor and wavefront\nreconstructor, and simulations of closed-loop control of wavefront aberrations.\nWe also present the compact flight DM controller, capable of driving up to 192\nactuator channels at 0-250V with 14-bit resolution. Two embedded Raspberry Pi 3\ncompute modules are used for task management and wavefront reconstruction. The\nspacecraft is a 6U CubeSat (30 cm x 20 cm x 10 cm) and launch is planned for\n2019.\n