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

Hirokazu Kataza; Takafumi Kamizuka; Kentaroh Watanabe; Hiroshi Murakami; Takehiko Wada

doi:10.1117/12.788730

10 July 2008 Optical design of image stabilizing Cassegrain-like balloon-borne telescope

Hirokazu Kataza, Takafumi Kamizuka, Kentaroh Watanabe, Hiroshi Murakami, Takehiko Wada

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70123S (2008) https://doi.org/10.1117/12.788730
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Hirokazu Kataza, Takafumi Kamizuka, Kentaroh Watanabe, Hiroshi Murakami, and Takehiko Wada "Optical design of image stabilizing Cassegrain-like balloon-borne telescope", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70123S (10 July 2008); https://doi.org/10.1117/12.788730

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KEYWORDS

Mirrors

Telescopes

Spherical lenses

Optical design

Sensing systems

Control systems

Space telescopes

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