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Thermal Assessment of Landsat-7 ETM+ Radiative Cooler in Instrument and Spacecraft Thermal Vacuum Tests and in Flight
Technical Paper
1999-01-2628
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
During the radiative cooler cool-down phase of the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) instrument thermal vacuum test #3, the coldest temperature that the cold focal plane array (CFPA) achieved was 89.5 K. The cold stage/CFPA temperature decreased from 315 K to 89.5 K in 80 hours. In the spacecraft and instrument integrated thermal vacuum test, the cold stage/ CFPA temperature decreased from 315 K to 86.9 K in 80 hours, and was still decreasing at a rate of 0.1 K/hr when the cool-down was terminated. The cool-down was faster, and a colder CFPA temperature was obtained. In flight, the cooler cool-down was even faster, and colder. The cold stage/CFPA temperature decreased from 315 K to 89.7 K in 33 hours, and was still decreasing at a rate of 1 K/hr when cool-down was terminated at 89.7 K. The factors that affected the ETM+ cooler cool-down are the radiation heat sink temperature for the cold stage and intermediate stage, parasitic radiation heat load to the cooler, parasitic conduction heat load to the cooler, and cooler outgas time preceding cooler cool-down.
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Citation
Choi, M., "Thermal Assessment of Landsat-7 ETM+ Radiative Cooler in Instrument and Spacecraft Thermal Vacuum Tests and in Flight," SAE Technical Paper 1999-01-2628, 1999, https://doi.org/10.4271/1999-01-2628.Also In
References
- Kane, J, et al., ETM+ Consent to Ship Review, CDRL53 Raytheon Goleta, CA Sept. 23-24 1998
- Choi, M. K. Thermal Design of Landsat-7 ETM+ Earth/Space Background Simulators, Proceedings of 32nd IECEC, Paper No. 97005 2 1470 1475 Honolulu, Hawaii July 27-Aug. 1, 1997
- Landsat-7 Flight Data, Landsat-7 Mission Operations Center, NASA Goddard Space Flight Center Greenbelt, MD April 15 May 15 1999