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Proceedings Paper

Alignment methods for Cassegrain and RC telescope with wide field of view
Author(s): Ho-Soon Yang; Yun-Woo Lee; Eugene D. Kim; Young-Wan Choi; Ad. Aziz Ad. Rasheed
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Paper Abstract

Ritchey-Chretien type or Cassegrain type has been widely used for earth-observing space camera. As most earth-observing cameras are required to scan the wide area in a single path, they generally have a wider field of view, compared to the ground-based telescope. However, the alignment of Cassegrain or RC telescope with a wide-field of view is not easy. One reason is that it has a central hole in the primary mirror so that it is difficult to find an optical axis. Another reason is that it can introduce much off-axis aberration such as coma and astigmatism, when it is aligned at on-axis with zero-coma condition. In this paper, we calculate the alignment accuracy using a conventional method for a RC type telescope of which diameter is 300 mm and field of view is 2.08 degrees. We suggest that the most effective alignment method for wide field of view system is a computer-aided alignment. With this method, it was found that the variation of rms wavefront error of the telescope over the entire field of view was less than 10 %.

Paper Details

Date Published: 30 September 2004
PDF: 8 pages
Proc. SPIE 5528, Space Systems Engineering and Optical Alignment Mechanisms, (30 September 2004); doi: 10.1117/12.558998
Show Author Affiliations
Ho-Soon Yang, Korea Research Institute of Standards and Science (South Korea)
Yun-Woo Lee, Korea Research Institute of Standards and Science (South Korea)
Eugene D. Kim, Satrec Initiative Co., Ltd. (South Korea)
Young-Wan Choi, Satrec Initiative Co., Ltd. (South Korea)
Ad. Aziz Ad. Rasheed, Astronautic Technology (M) Sdn. Bhd. (Malaysia)

Published in SPIE Proceedings Vol. 5528:
Space Systems Engineering and Optical Alignment Mechanisms
Lee D. Peterson; Robert C. Guyer, Editor(s)

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