Optical performance evaluation of near-infrared camera (NIR) on board ASTRO-F

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

doi:10.1117/12.615810

18 August 2005 Optical performance evaluation of near infrared camera (NIR) on board ASTRO-F

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

Author Affiliations +

Proceedings Volume 5904, Cryogenic Optical Systems and Instruments XI; 590418 (2005) https://doi.org/10.1117/12.615810
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

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Woojung Kim, Hideo Matsuhara, Takashi Onaka, Hirokazu Kataza, Takehiko Wada, Kazunori Uemizu, Munetaka Ueno, Hiroshi Murakami, Naofumi Fujishiro, Daisuke Ishihara, Hidenori Watarai, Norihide Takeyama, and Yuji Ikeda "Optical performance evaluation of near infrared camera (NIR) on board ASTRO-F", Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 590418 (18 August 2005); https://doi.org/10.1117/12.615810

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