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Proceedings Paper

Cold chopper system for mid-infrared instruments
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Paper Abstract

We have developed a cold chopper system for mid-infrared observations. This system is installed into the newly developing mid-infrared instrument, MAX38, for the University of Tokyo Atacama 1.0-m telescope. It is cooled to about 9K. The cold chopper mirror is controlled by a piezoelectric actuator with a flexure hinge lever, and enables square-wave chopping at a frequency up to 7.8 Hz. At the moment, the maximum throw of the chopper is 30 arcseconds on the sky. This cooled chopping mirror system can also be applied to the tip-tilt mirror for SPICA infrared space telescope. We carried out the first light with Kanata 1.5-m telescope at Higashi-Hiroshima Observatory (Hiroshima, Japan) in June 2007 and March 2008. In this observation, we demonstrated that the cold chopper could cancel out the atmospheric turbulence noise of a frequency of 5 Hz at 8.9 micron.

Paper Details

Date Published: 25 July 2008
PDF: 9 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70184H (25 July 2008); doi: 10.1117/12.787762
Show Author Affiliations
Tomohiko Nakamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
The Univ. of Tokyo (Japan)
Takashi Miyata, Institute of Astronomy, The Univ. of Tokyo (Japan)
Shigeyuki Sako, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takashi Onaka, The Univ. of Tokyo (Japan)
Keigo Enya, Japan Aerospace Exploration Agency (Japan)
Hirokazu Kataza, Japan Aerospace Exploration Agency (Japan)
Hidenori Takahashi, Gunma Astronomical Observatory (Japan)
Yoshiyuki Obuchi, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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