@inproceedings{25dd53bfef5e443aa788fe1e5132524f,
title = "Membrane mirror evaluation of APERTURE: A precise extremely large reflective telescope using re-configurable elements",
abstract = "Larger mirrors are needed to satisfy the requirements of the next generation of UV-Vis space telescopes. Our NASA-NIAC funded project, titled A Precise Extremely large Reflective Telescope Using Reconfigurable Elements (APERTURE), attempts to meet this requirement. The aim of the project is to demonstrate technology that would deploy a large, continuous, high figure accuracy membrane mirror. The figure of the membrane mirror is corrected after deployment using a contiguous coating of a Magnetic Smart Material (MSM) and a magnetic field. The MSM is a magnetostrictive material which is driven by magnetic write head(s) (MWH), locally imposed on the non-reflective side of the membrane mirror. In this proceeding we report the figure accuracy of the MSM coated membrane mirror under various conditions using a Shack-Hartmann surface profiler. The figure accuracy and magnetostrictive performance of the membrane mirror is found to be significantly dependent on ambient temperature fluctuations, the tension load on the membrane, time, magnetic writing head orientation and magnetic field strength. The results and reproducibility of the surface profiling experiments under various conditions are introduced and discussed.",
keywords = "Deployable Optics, Magnetic Smart Materials, Magnetostriction, Membrane Mirrors, Post Deployment Correction, Space Mirrors, Space Telescopes",
author = "Baturalp, {Turgut B.} and Coverstone, {Victoria L.} and Rocco Coppejans and Jian Cao and Yipwah Chung and Buchholz, {David B.} and Ulmer, {M. P.}",
note = "Funding Information: This work was supported by NASA NIAC grant number NNX15AL89G. The authors would also like to thank David Pappas, Dr. Marco Quadrelli, Dr. Peter Takacs, Dr. Ron Shiri, Drs. Steve Arnold and Drs. William W. Zhang for advice and support. We thank Giovanni Pareschi for suggesting working with MSM films in the first place. Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave ; Conference date: 10-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2309826",
language = "English (US)",
isbn = "9781510619494",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Fazio, {Giovanni G.} and MacEwen, {Howard A.} and Makenzie Lystrup",
booktitle = "Space Telescopes and Instrumentation 2018",
}