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Proceedings Paper

The DART cylindrical infrared 1-meter membrane reflector
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Paper Abstract

The Dual Anamorphic Reflector Telescope (DART) is an architecture for large aperture space telescopes that enables the use of membranes. A membrance can be readily shaped in one direction of curvature using a combination of boundary control and tensioning, yielding a cylindrical reflector. Two cylindrical reflectors (orthogonal and confocal) comprise the 'primary mirror' of the telescope system. The aperture is completely unobstructed and ideal for infrared and high contrast observations. The DART high precision testbed researches fabrication, assembly, adjustment and characterization of 1 meter cylindrical membrane reflectors made of copper foil or kapton. We have implemented two metrology instruments: a non-contacting, scanning profilometer and an infrared interferometer. The profilometer is a laser confocal displacement measuring unit on an XYZ scanning stage. The infrared interferometer used a cylindrical null lens that tests a subaperture of the membrane at center of curvature. Current surface figure achieved is 25 μm rms over a 50 cm diameter aperture.

Paper Details

Date Published: 24 September 2004
PDF: 12 pages
Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); doi: 10.1117/12.562451
Show Author Affiliations
Rhonda M. Morgan, Jet Propulsion Lab. (United States)
Greg A. Agnes, Jet Propulsion Lab. (United States)
Dan Barber, Jet Propulsion Lab. (United States)
Jennifer Dooley, Jet Propulsion Lab. (United States)
Mark Dragovan, Jet Propulsion Lab. (United States)
Al E. Hatheway, AEH, Inc. (United States)
Marty Marcin, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5494:
Optical Fabrication, Metrology, and Material Advancements for Telescopes
Eli Atad-Ettedgui; Philippe Dierickx, Editor(s)

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