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Proceedings Paper

Development and tests of interferometry facility in 6-m diameter radiometer thermal vacuum chamber in Tsukuba Space Center
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Paper Abstract

We present a test of optical metrology for 800-mm spaceborne optics in the 6-m radiometer thermal vacuum chamber at JAXA's Tsukuba Space Center of JAXA. Under the framework of the JAXA's large-optics study program for astronomy and Earth observations, we developed a test bench for interferometric metrology of large optics with an auto-collimation method in the chamber. The optical system was aligned in a horizontal light-axis configuration within the facility limit to handle a 3.5-m aperture telescope like SPICA. A high-speed interferometer was contained in an aluminum and titanmade pressure vessel, which was mounted on the five-axis stage. We tested the 800-mm lightweight C/SiC optics using a 900-mm diameter flat mirror. Alignment changes in tilts of about ten arcseconds were observed as pressure went down from 1 atm to vacuum. After we re-aligned the interferometer and flat mirror, the wavefronts through the optics under vacuum were observed to increase in astigmatism aberration by 0.07λRMS at λ=633nm from under atmosphere, which might be caused by a deformation in the test optics or flat mirror.

Paper Details

Date Published: 11 August 2010
PDF: 7 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77313X (11 August 2010); doi: 10.1117/12.857547
Show Author Affiliations
Masahiro Suganuma, Japan Aerospace Exploration Agency (Japan)
Haruyoshi Katayama, Japan Aerospace Exploration Agency (Japan)
Masataka Naitoh, Japan Aerospace Exploration Agency (Japan)
Tadashi Imai, Japan Aerospace Exploration Agency (Japan)
Masashi Miyamoto, Japan Aerospace Exploration Agency (Japan)
Kenta Maruyama, Japan Aerospace Exploration Agency (Japan)
Hidehiro Kaneda, Nagoya Univ. (Japan)
Yoshio Tange, Japan Aerospace Exploration Agency (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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