Cold chopper system for mid-infrared instruments

Details Cold chopper system for mid-infrared instruments Cold chopper system for mid-infrared instruments

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7018e.142n&link_type=abstract

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation. Edited by Atad-Ettedgui, Eli; Lemke, Dietrich.

Physics

1

Scientific paper

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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