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Proceedings Paper

MODIS solar diffuser: modeled and actual performance
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Paper Abstract

The MODIS instrument's solar diffuser is used in its radiometric calibration for the reflective solar bands (VIS, NIR, and SWIR) ranging from 0.41 to 2.1 micron. The sun illuminates the solar diffuser either directly or through an attenuation screen. The attenuation screen consists of a regular array of pin holes. The attenuated illumination pattern on the solar diffuser is not uniform, but consists of a multitude of pin-hole images of the sun. This non-uniform illumination produces small, but noticeable radiometric effects. A description of the computer model used to simulate the effects of the attenuation screen is given and the predictions of the model are compared with actual, on-orbit, calibration measurements.

Paper Details

Date Published: 18 January 2002
PDF: 10 pages
Proc. SPIE 4483, Earth Observing Systems VI, (18 January 2002); doi: 10.1117/12.453448
Show Author Affiliations
Eugene Waluschka, NASA Goddard Space Flight Ctr. (United States)
Joseph A. Esposito, Science Systems and Applications, Inc. (United States)
Jun-Qiang Sun, Science Systems and Applications, Inc. (United States)
Xindong Wang, Science Systems and Applications, Inc. (United States)
Xiaoxiong Xiong, Science Systems and Applications, Inc. (United States)

Published in SPIE Proceedings Vol. 4483:
Earth Observing Systems VI
William L. Barnes, Editor(s)

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