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18 August 2005 Development of Cassegrain type 0.9-m collimator
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Collimator is essential to evaluate and assemble the other telescopes. Its diameter should be larger than that of the target telescope for the correct use. We are currently developing the Cassegrain type collimator of which diameter is 0.9 m. The primary mirror is light-weighted so that its weight is only 70 kg. Due to its structure, the primary mirror can be supported only at the backside of the mirror. This mirror is tested with the combination of null Hartmann test and interferometer. The secondary mirror is tested with a Hindle method. This method requires 600 mm high quality spherical mirror. The distance between the primary and secondary mirror is maintained by the Carbon composite material. The assembly of two mirrors is carried out by the computer aided alignment method. The whole structure is designed to maintain the performance of the collimator under +/-5 degrees of temperature variation.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ho-Soon Yang, Myung-Seok Kang, Sung-Hee Kim, Yun-Woo Lee, Jae-Hyub Lee, Jae-Bong Song, Hoi-Youn Lee, Sung-Whan Kim, Jong-Ung Lee, and In-Won Lee "Development of Cassegrain type 0.9-m collimator", Proc. SPIE 5869, Optical Manufacturing and Testing VI, 586913 (18 August 2005);

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