25 July 2008 Cold chopper system for mid-infrared instruments
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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.
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Tomohiko Nakamura, Takashi Miyata, Shigeyuki Sako, Takashi Onaka, Keigo Enya, Hirokazu Kataza, Hidenori Takahashi, Yoshiyuki Obuchi, "Cold chopper system for mid-infrared instruments", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70184H (25 July 2008); doi: 10.1117/12.787762; https://doi.org/10.1117/12.787762
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