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Proceedings Paper

Figure verification of a precision ultra-lightweight mirror: techniques and results from the SHARPI/PICTURE mirror at NASA/GSFC
Author(s): Scott Antonille; David Content; Doug Rabin; Shane Wake; Thomas Wallace
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Paper Abstract

A high-precision ultra-lightweight 0.5m mirror with ultraviolet grade tolerances on surface figure quality has been measured from its delivery to the Goddard Space Flight Center, through the coating and mounting process, and shown to survive component vibration testing. This 4.5kg, 0.5m paraboloid mirror is the prime optic of two sounding-rocket telescopes: SHARPI (solar high angular resolution photometric imager) and PICTURE (planet imaging concept testbed using a rocket experiment). By integrating the analysis of interferometer data with finite element models, we demonstrate the ability to isolate surface figure effects comparable to UV diffraction limited tolerances from much larger gravity and mount distortions. The ability to measure such features paired with in situ monitoring of mirror figure through the mirror mounting process has allowed for a diagnosis of perturbations and the remediation of process errors. In this paper, we describe the technical approach used to achieve nanometer scale measurement accuracy, we report and decompose the final mounted surface figure of 12.5 nm RMS, and we describe the techniques that were developed and employed in the pursuit of maintaining UV diffraction-limited performance with this aggressively lightweighted mirror.

Paper Details

Date Published: 15 July 2008
PDF: 15 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70110Z (15 July 2008); doi: 10.1117/12.788962
Show Author Affiliations
Scott Antonille, NASA Goddard Space Flight Ctr. (United States)
David Content, NASA Goddard Space Flight Ctr. (United States)
Doug Rabin, NASA Goddard Space Flight Ctr. (United States)
Shane Wake, NASA Goddard Space Flight Ctr. (United States)
Thomas Wallace, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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