
Proceedings Paper
Pre-launch characterization of spectral response functions for the Clouds and Earth's Radiant Energy System (CERES) instrument sensorsFormat | Member Price | Non-Member Price |
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Paper Abstract
The Clouds and Earth's Radiant Energy System (CERES) uses four instruments onboard two spacecraft to make
measurements of the earth's reflected shortwave and emitted longwave radiation, which constitute two components of
earth radiation budget. Flight Models 1 and 2 (FM1, FM2) are onboard the TERRA spacecraft and Flight Models 3 and 4
(FM3, FM4) are onboard the AQUA spacecraft. The measurements are made using three radiometric sensor channels on
each instrument- shortwave channel (0.3-5 microns), window channel (8-12 microns) and total channel (0.3-200
microns). This paper describes the process of obtaining the estimates of the spectral response functions of the three
sensor channels using pre-launch measurements. The shortwave spectral response function (0.3-2 microns) for the
shortwave channel as well as the shortwave region of the total channel is obtained through measurements of the
components in the optical path. The longwave responses (>2 microns) are obtained using a Fourier Transform
Spectrometer (FTS) system. The CERES sensors as well as a reference detector, which is used to account for any
measurement or background noise in the system, acquire measurements of the FTS. By the use of various sources and
beam-splitters in the spectrometer, the entire spectral range of the broadband total channel is covered. The spectral
estimates are obtained in smaller, overlapping bands, which are then tied together appropriately to obtain the end-to-end
spectral response function for each of the sensors for all CERES instruments.
Paper Details
Date Published: 26 August 2010
PDF: 8 pages
Proc. SPIE 7807, Earth Observing Systems XV, 780702 (26 August 2010); doi: 10.1117/12.859927
Published in SPIE Proceedings Vol. 7807:
Earth Observing Systems XV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)
PDF: 8 pages
Proc. SPIE 7807, Earth Observing Systems XV, 780702 (26 August 2010); doi: 10.1117/12.859927
Show Author Affiliations
Mohan Shankar, Science Systems and Applications, Inc. (United States)
Susan Thomas, Science Systems and Applications, Inc. (United States)
Susan Thomas, Science Systems and Applications, Inc. (United States)
Kory Priestley, NASA Langley Research Ctr. (United States)
Published in SPIE Proceedings Vol. 7807:
Earth Observing Systems XV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)
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