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Measurements of Low Hemispheric Emissivity at Low Temperatures - Designing a Cryogenic Test Bench
Technical Paper
2000-01-2526
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes the theoretical principle for measuring total hemispheric emissivity by a conventional calorimetric method. A sample, whose emissivity is to be measured, is suspended within a vacuum chamber (pressure < 10−7 mbar). The heater-equipped sample radiates to a “cold” thermal environment. In equilibrium state, knowledge of the heater-dissipated electric power, of sample temperatures, and of the environment will yield the total hemispheric emissivity of the area. Optimizing the measurement's delicate transition from theoretical principle to practical implementation was made possible by fine analysis of the error budget related to this experiment, leading on to designing a total hemispheric emissivity bench capable of measurements over the 300 K-to-80 K ranges to within 0.04 and 0.03 accuracies at these respective temperatures.
A measurement campaign was conducted on two types of space-application area coatings, respectively the MAPS2 PCBZ white paint and the AEROGLAZE Z306 black paint, at different temperatures: from 85 K to 300 K. The results obtained on Z306 were compared and contrasted with those obtained by two other research laboratories.
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Citation
Fabron, C., "Measurements of Low Hemispheric Emissivity at Low Temperatures - Designing a Cryogenic Test Bench," SAE Technical Paper 2000-01-2526, 2000, https://doi.org/10.4271/2000-01-2526.Also In
References
- « SST Radiator Emissivity measurements » H. Petersen (Fokker Space & Systems). Report: MSG-FOK-SE-TR-0407. 16/10/97. Report of measurements made in the « Paul Scherrer Institute » Switzerland
- « Measurement of total hemispherical emittance on spacecraft thermalcontrol coatings » Ramasamy A. Sundaresan N. K. Padmanabhan Guota P. P. Narayana Murthy H. SAE International: The Engineering Society For Advancing Mobility Land Sea Air and Space. 22 nd International Conference on Environmental Systems Seattle, Washington July 13-16 1992
- « The evaluation of the emittance of coating paints » Hashizume T. Ohnishi A. Hayashi T. American Institute of Aeronautics and Astronautics paper NO. 85-0992, 20 th Thermophysics Conference Williamsburg, Virginia June 19-21 1985
- « Measurement of total hemispherical emittance on various OSR » Ramasamy A. Sundaresan N. K. Padmanabhan Gupta P. P. Bhandari D. R. Narayana Murthy H. SAE International: The Engineering Society For Advancing Mobility Land Sea Air and Space. 24 th International Conference on Environmental Systems Freidrichshafen, Germany June 20-23 1994
- « Measurement of the total hemispherical emittance of epoxy adhesive in the temperature range 144 K to 440 K » Cravalho Ernest Toscano William M. American Instiute of Aeronautics and Astronautics paper NO. 75-662 Denver, Colorado May 27-29 1975
- « Solar absportance and hemispherical emittance of various metals at space conditions » Jack John R. Spisz ernie W. American Institute of Aeronautics and Astronautics paper NO. 69-060, 7 th Aerospace Sciences Meeting New York City, New York January 20-22 1969
- « Measurement of total hemispherical of different areas at temperature from 4.4 K to 200 K » Jamotton Pierre Cucchiaro Antonio Demaret David Balbeur Henri (CSL, Université de lièges.CSL REPORT for MSG program 1997
- «Total hemispheric emissivity measurement at 80 K » Vinet P. ASPI Report September 1998
- « Measurement of total hemispherical emittance at cryogenic temperatures » Furusawa Tohru Nagasaka Yuji SAE International: The Engineering Society For Advancing Mobility Land Sea Air and Space. 26 th International Conference on Environmental Systems Monterey, California July 8-11 1996
- « Thermodynamique » Kastler A. 6 éme édition, Masson & Cie 1965