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Proceedings Paper

Imaging performance of near-infrared (NIR) channel in infrared camera (IRC) onboard ASTRO-F
Author(s): Woojung Kim; Hideo Matsuhara; Takashi Onaka; Kazunori Uemizu; Taketoshi Negishi; Norihide Takeyama
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Paper Abstract

The Infrared Camera (IRC) is one of the focal-plane instruments on board ASTRO-F(Japanese Infrared Astronomical satellite to be launched in 2004). IRC will make imaging and spectroscopy observations in the near- and mid-infrared regions. IRC comprises of three channels; NIR, MIR-S and MIR-L, which cover 2-5, 5-12, and 12-26μm, respectively. In this paper we report the optical performance of the NIR imaging mode at cryogenic temperatures with three filters; N2, N3, and N4, which cover the wavelength regions of 2-2.7, 2.7-3.7, and 3.7-5.05μm, respectively. The NIR channel consists of three Si and one Ge lenses with the infrared array (412 x 512 format of InSb) manufactured by Raytheon IRO. At cryogenic temperatures (- 6K) we found slightly larger chromatic focal shifts than designed probably due to the uncertainty in low-temperature refractive indices of the lens materials. We obtained the modulation transfer function for each band by the knife-edge method and estimated the optical performance of the IRC with the telescope at cryogenic temperatures.

Paper Details

Date Published: 5 March 2003
PDF: 7 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461239
Show Author Affiliations
Woojung Kim, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
Hideo Matsuhara, Institute of Space and Astronautical Science (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Kazunori Uemizu, Nishi-Harima Astronomical Observatory (Japan)
Taketoshi Negishi, Univ. of Tokyo (Japan)
Norihide Takeyama, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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