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Proceedings Paper

Optical performance evaluation of near-infrared camera (NIR) on board ASTRO-F
Author(s): Woojung Kim; Hideo Matsuhara; Takashi Onaka; Hirokazu Kataza; Takehiko Wada; Kazunori Uemizu; Munetaka Ueno; Hiroshi Murakami; Naofumi Fujishiro; Daisuke Ishihara; Hidenori Watarai; Norihide Takeyama; Yuji Ikeda
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Paper Abstract

The ASTRO-F is an on-going infrared satellite mission covering 2-200 μm infrared wavelengths. Not only the all-sky survey in the mid-IR and far-IR, but also deep pointing observations are planned especially at 2-26 μm. In this paper, we focus on the near-infrared (NIR) channel of the infrared camera (IRC) on board ASTRO-F, and describe its design, and results of the imaging mode performance evaluation as a single component. The NIR consists of 4 lenses (Silicon - Silicon - Germanium - Silicon) with a 412 * 512 In:Sb detector. Three broad-band filters, and two spectroscopic elements are installed covering 2-5 μm wavelengths. Since the ASTRO-F telescope and the focal plane are cooled to 6 K, the evaluation of adjustment of the focus and the end-to-end test of the whole NIR camera assembly have to be done at cryogenic temperature. As a result of measurements, we found that the transverse magnification and distortion are well matched with the specification value (1 versus 1.017 and 1 %), while the chromatic aberration, point spread function, and encircled energy are slightly degraded from the specification (300 μm from 88 μm, > 1pixel from ~ 1pixel, 80 % encircled energy radius > 1pixel from ~ 1pixel). However, with these three measured values, in-flight simulations show the same quality as specification without degradation. In addition to the image quality, we also verified the ghost image generated from the optical element (1 % energy fraction to the original image) and the slightly narrowed field of view (10' * 9.5' from 10' * 10'). For the responsivity, the NIR shows expected response. Totally, the NIR imaging mode shows satisfactory results for the expected in-flight performance.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 590418 (18 August 2005); doi: 10.1117/12.615810
Show Author Affiliations
Woojung Kim, Institute of Space and Astronautical Science (Japan)
Japan Society for the Promotion of Science (Japan)
Hideo Matsuhara, Institute of Space and Astronautical Science (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science (Japan)
Takehiko Wada, Institute of Space and Astronautical Science (Japan)
Kazunori Uemizu, NishiHarima Astronomical Observatory (Japan)
Munetaka Ueno, Univ. of Tokyo (Japan)
Hiroshi Murakami, Institute of Space and Astronautical Science (Japan)
Naofumi Fujishiro, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
Daisuke Ishihara, Univ. of Tokyo (Japan)
Hidenori Watarai, Japan Aerospace Exploration Agency (Japan)
Norihide Takeyama, Genesia Corp. (Japan)
Yuji Ikeda, Genesia Corp. (Japan)

Published in SPIE Proceedings Vol. 5904:
Cryogenic Optical Systems and Instruments XI
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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