Development of Cassegrain type 0.9-m collimator

Ho Soon Yang, Myung Seok Kang, Sung Hee Kim, Yun Woo Lee, Jae Hyub Lee, Jae Bong Song, Hoi Youn Lee, Sug Whan Kim, Jong Ung Lee, In Won Lee

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Article number586913
Pages (from-to)1-9
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2005
EventOptical Manufacturing and Testing VI - San DIego, CA, United States
Duration: 2005 Jul 312005 Aug 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Development of Cassegrain type 0.9-m collimator'. Together they form a unique fingerprint.

Cite this