HR: 16:50h
AN: A54D-05    [Abstracts]
TI: A New Approach For Absolute Temperature Calibration: Application to the CLARREO Mission
AU: * Best, F A
EM: fred.best@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center 1225 W. Dayton St., Madison, WI 53706, United States
AU: Adler, D P
EM: doug.adler@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center 1225 W. Dayton St., Madison, WI 53706, United States
AU: Ellington, S D
EM: scott.ellington@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center 1225 W. Dayton St., Madison, WI 53706, United States
AU: Thielman, D J
EM: don.thielman@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center 1225 W. Dayton St., Madison, WI 53706, United States
AU: Revercomb, H E
EM: hank.revercomb@ssec.wis.edu
AF: University of Wisconsin, Space Science and Engineering Center 1225 W. Dayton St., Madison, WI 53706, United States
AU: Anderson, J G
EM: anderson@huap.harvard.edu
AF: Harvard University, 12 Oxford Street (Link), Cambridge, MA 02138, United States
AB: A novel scheme to provide on-orbit absolute calibration of blackbody temperature sensors (on-demand) has been demonstrated using a copy of the engineering model version of a space flight hardware blackbody design (GIFTS). The scheme uses the phase change signature of reference materials to assign an absolute temperatures scale to the blackbody sensors over a large temperature range. Uncertainties of better than 0.020 K have been demonstrated over the temperature range from 234 to 303 K. Thermal modeling has been conducted to optimize the design, and to show that accuracies comparable to those measured in the laboratory should be obtainable in the less-controlled on-orbit temperature environment. The implementation if this scheme is very attractive due to its simplicity and relatively low mass. In addition, all aspects of the electronics (control and temperature readout) needed to support this scheme have been developed and demonstrated in the as-delivered GIFTS Engineering Model blackbody calibration system developed by the University of Wisconsin. NASA's anticipated plan for a mission dedicated to Climate (CLARREO) will hinge upon the ability to fly absolute standards that can provide the basis to meet stringent requirements on measurement accuracy. For example, instrumentation designed to measure spectrally resolved infrared radiances will require high-emissivity calibration blackbodies having absolute temperature uncertainties of better than 0.020 K (3 sigma). The novel blackbody temperature calibration scheme described here is very well suited for the CLARREO mission because if its low mass, high accuracy, and ease of implementation into a demonstrated flight blackbody design.
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting