Imaging performance of near-infrared (NIR) channel in infrared camera (IRC) onboard ASTRO-F

Woojung Kim; Hideo Matsuhara; Takashi Onaka; Kazunori Uemizu; Taketoshi Negishi; Norihide Takeyama

doi:10.1117/12.461239

5 March 2003 Imaging performance of near infrared (NIR) channel in infrared camera (IRC) onboard ASTRO-F

Woojung Kim, Hideo Matsuhara, Takashi Onaka, Kazunori Uemizu, Taketoshi Negishi, Norihide Takeyama

Proceedings Volume 4850, IR Space Telescopes and Instruments; (2003) https://doi.org/10.1117/12.461239
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Woojung Kim, Hideo Matsuhara, Takashi Onaka, Kazunori Uemizu, Taketoshi Negishi, and Norihide Takeyama "Imaging performance of near infrared (NIR) channel in infrared camera (IRC) onboard ASTRO-F", Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); https://doi.org/10.1117/12.461239

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