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30 September 2004 Alignment methods for Cassegrain and RC telescope with wide field of view
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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 %.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ho-Soon Yang, Yun-Woo Lee, Eugene D. Kim, Young-Wan Choi, and Ad. Aziz Ad. Rasheed "Alignment methods for Cassegrain and RC telescope with wide field of view", Proc. SPIE 5528, Space Systems Engineering and Optical Alignment Mechanisms, (30 September 2004);


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