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Proceedings Paper

Optical design of image stabilizing Cassegrain-like balloon-borne telescope
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Paper Abstract

We describe the optical design of balloon-borne telescope with an image stabilizing secondary mirror which correct the pointing error of the attitude control system and enable a long-time exposure. We adopted a Cassegrain-like two-mirror system, and investigated the best mirror surface figure by surveying Conic constant (K) of the primary mirror from -1 to 0, where the secondary mirror is a high order aspheric surface to cancel spherical aberration at each K. In the small pointing error region, the classical Cassegrain system (K=-1) provides a wide field of view. However, in the large pointing error region, systems with large K provide a wide FOV. For λt (target wavelength) =50µm and 69cm aperture, a spherical primary system has acceptable optical performances when we assume the pointing error around 0.3 degree.

Paper Details

Date Published: 10 July 2008
PDF: 8 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70123S (10 July 2008); doi: 10.1117/12.788730
Show Author Affiliations
Hirokazu Kataza, Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency (Japan)
Takafumi Kamizuka, Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency (Japan)
The Univ. of Tokyo (Japan)
Kentaroh Watanabe, Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency (Japan)
Hiroshi Murakami, Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency (Japan)
Takehiko Wada, Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency (Japan)


Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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