The DART cylindrical infrared 1-meter membrane reflector

Rhonda M. Morgan; Greg A. Agnes; Dan Barber; Jennifer Dooley; Mark Dragovan; Al E. Hatheway; Marty Marcin

doi:10.1117/12.562451

24 September 2004 The DART cylindrical infrared 1-meter membrane reflector

Rhonda M. Morgan, Greg A. Agnes, Dan Barber, Jennifer Dooley, Mark Dragovan, Al E. Hatheway, Marty Marcin

Proceedings Volume 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes; (2004) https://doi.org/10.1117/12.562451
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

Citation Download Citation

Rhonda M. Morgan, Greg A. Agnes, Dan Barber, Jennifer Dooley, Mark Dragovan, Al E. Hatheway, and Marty Marcin "The DART cylindrical infrared 1-meter membrane reflector", Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); https://doi.org/10.1117/12.562451

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