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Proceedings Paper

Development of the longwave infrared imager (LIR) onboard PLANET-C
Author(s): Tetsuya Fukuhara; Makoto Taguchi; Takeshi Imamura; Masato Nakamura; Naomoto Iwagami; Munetaka Ueno; Makoto Suzuki; George L. Hashimoto; Mitsuteru Sato; Atsushi Yamazaki; Ryoichi Kashikawa; Isamu Higashino; Kazuhide Noguchi
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Paper Abstract

The Longwave Infrared Camera (LIR), which mounts an uncooled micro-bolometer array (UMBA), is under development for the Japanese Venus orbiter mission, PLANET-C. LIR detects thermal emission from the top of the sulfur dioxide cloud in a wavelength region 8--12 μm to map the cloud-top temperature which is typically as low as 230 K. The requirement for the noise equivalent temperature difference (NETD) is 0.3 K. Images of blackbody targets in room temperature (~300 K) and low temperature (~230 K) have been acquired in a vacuum environment using a prototype model of LIR, showing that the NETD of 0.2 K and 0.8 K are achieved in ~300 K and ~230 K, respectively. We expect that the requirement of NETD<0.3 K for ~230 K targets will be achieved by averaging several tens of images which are acquired within a few minutes. The vibration test for the UMBA was also carried out and the result showed the UMBA survived without any pixel defects or malfunctions. The tolerance to high-energy protons was tested and verified using a commercial camera in which a same type of UMBA is mounted. Based on these results, a flight model is now being manufactured with minor modifications from the prototype.

Paper Details

Date Published: 15 May 2008
PDF: 8 pages
Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 694030 (15 May 2008); doi: 10.1117/12.784932
Show Author Affiliations
Tetsuya Fukuhara, Japan Aerospace Exploration Agency (Japan)
Makoto Taguchi, National Institute for Polar Research (Japan)
Takeshi Imamura, Japan Aerospace Exploration Agency (Japan)
Masato Nakamura, Japan Aerospace Exploration Agency (Japan)
Naomoto Iwagami, The Univ. of Tokyo (Japan)
Munetaka Ueno, The Univ. of Tokyo (Japan)
Makoto Suzuki, Japan Aerospace Exploration Agency (Japan)
George L. Hashimoto, Kobe Univ. (Japan)
Mitsuteru Sato, Tohoku Univ. (Japan)
Atsushi Yamazaki, Japan Aerospace Exploration Agency (Japan)
Ryoichi Kashikawa, NEC TOSHIBA Space Systems, Ltd. (Japan)
Isamu Higashino, NEC TOSHIBA Space Systems, Ltd. (Japan)
Kazuhide Noguchi, NEC TOSHIBA Space Systems, Ltd. (Japan)

Published in SPIE Proceedings Vol. 6940:
Infrared Technology and Applications XXXIV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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