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Proceedings Paper

Membrane mirror evaluation of APERTURE: a precise extremely large reflective telescope using re-configurable elements
Author(s): Turgut B. Baturalp; Victoria L. Coverstone; Rocco Coppejans; Jian Cao; YipWah Chung; David B. Buchholz; M. P. Ulmer
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Paper 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.

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981K (6 July 2018); doi: 10.1117/12.2309826
Show Author Affiliations
Turgut B. Baturalp, Texas Tech Univ. (United States)
Victoria L. Coverstone, Univ. of Miami (United States)
Rocco Coppejans, Northwestern Univ. (United States)
Jian Cao, Northwestern Univ. (United States)
YipWah Chung, Northwestern Univ. (United States)
David B. Buchholz, Northwestern Univ. (United States)
M. P. Ulmer, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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