Development of the Longwave Infrared Camera (LIR)!! onboard PLANET-C

Tetsuya Fukuhara, Maketo Taguchi, Takeshi Imamura, Masate Nakamura, Naomoto Iwagami, Munetaka Ueno, Makoto Suzuki, George L. Hashimoto, Mitsuteru Sato, Atsushi Yamazaki, Ryoichi Kashikawa, Isamu Higashino, Kazuhide Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationInfrared Technology and Applications XXXIV
Publication statusPublished - Jun 26 2008
Externally publishedYes
EventInfrared Technology and Applications XXXIV - Orlando, FL, United States
Duration: Mar 17 2008Mar 20 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherInfrared Technology and Applications XXXIV
Country/TerritoryUnited States
CityOrlando, FL


  • Camera
  • Infrared
  • Microbolometer
  • Venus

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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