천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제35권2호
- /
- Pages.62.2-62.2
- /
- 2010
- /
- 1226-2692(pISSN)
Focal Reducer for CQUEAN
- Lim, Ju-Hee (Dept. of Astronomy and Space Science, Kyung Hee University) ;
- Chang, Seung-Hyuk (Samsung Electronics, Co.) ;
- Kim, Young-Ju (Green Optics, Co.) ;
- Kim, Jin-Young (Dept. of Astronomy and Space Science, Kyung Hee University) ;
- Park, Won-Kee (CEOU/Dept. of Physics and Astronomy, Seoul National University) ;
- Im, Myung-Shin (CEOU/Dept. of Physics and Astronomy, Seoul National University) ;
- Pak, Soo-Jong (School of Space Research, Kyung Hee University)
- 발행 : 2010.10.06
초록
The CQUEAN (Camera for QUasars in EArly uNiverse) is an optical CCD camera optimized for the observation of high redshift QSOs to understand the nature of early universe. The focal reducer, which is composed of four spherical lens, is allowed to secure a wider field of view for CQUEAN, by reducing the focal length of the system by one third. We designed the lens configuration, the lens barrel, and the adapters to assemble to attach focal reducer to the CCD camera system. We performed tolerance analysis using ZEMAX. The manufacturing of the focal reducer system and its lab test of optical performance were already finished. It turned out that the performance can meet the original requirement, with the aberration and alignment error taken into account. We successfully attached the focal reducer and CQUEAN to the cassegrain focus of 2.1m telescope at McDonald Observatory, USA, and several tests of CQUEAN system were carried out. In this presentation, I will show the process of focal reducer fabrication and the result of performance test.
키워드