Journal
APPLIED OPTICS
Volume 49, Issue 14, Pages 2728-2735Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.49.002728
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- Basque government [S-PC08UN07]
- University of the Basque Country [UE06/01]
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We analyze two important points related to the experimental emissivity measurements in this paper: the radiometer calibration accuracy and its stability to determine the required frequency of calibration. The usual two-temperature calibration method is compared to a more accurate method, which uses the measurement of blackbody radiation at several temperatures. Additionally, the suitability of the two-temperature method is studied as a function of the gap between both temperatures. Differences higher than 200 degrees C are needed to obtain an acceptable calibration. The temporal stability of the calibration and the influence of the environmental conditions are also analyzed. (C) 2010 Optical Society of America
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