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Proceedings Paper

High-temperature fixed points for pre-launch calibration of earth observing sensors
Author(s): Yoshiro Yamada; Juntaro Ishii
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Paper Abstract

High-temperature fixed points of metal-carbon systems, currently the target of a project in the international thermometry standards community, is also of high interest for pre-launch radiometric calibration of hyperspectral earth observing sensor in the blue wavelengths, where the conventional copper fixed point fails to supply sufficient radiance. For such a calibration, a fixed-point possibly around 2000 K is desired. One requirement for application of the high-temperature blackbody fixed-point cell to remote sensor calibration is to increase the radiating source aperture diameter to a size large enough to target with a radiance comparator based on a grating monochromator. In this presentation, a fixed-point cell of Co-C eutectic (1597 K) for remote sensor calibration application is described. An enlarged 7-mm aperture design is employed for the fixed-point cell while at the same time retaining the outer dimension to fit in existing fixed-point furnaces. The observed plateaux showed temperature and repeatability comparable to conventional 3-mm aperture cells, while cavity breakages indicates the need for improved robustness in the crucible design. Extension of the technique to Pt-C eutectic (2011 K) or Cr3C2-C peritectic (2100 K) systems, and subsequent application to calibration of the HISUI sensor is envisaged.

Paper Details

Date Published: 13 September 2011
PDF: 6 pages
Proc. SPIE 8153, Earth Observing Systems XVI, 81531W (13 September 2011); doi: 10.1117/12.895098
Show Author Affiliations
Yoshiro Yamada, National Institute of Advanced Industrial Science and Technology (Japan)
Juntaro Ishii, National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 8153:
Earth Observing Systems XVI
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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