Temperature dependence of the graybody approximation to emissivity for some common materials

Robert P. Madding

doi:10.1117/12.459601

15 March 2002 Temperature dependence of the graybody approximation to emissivity for some common materials

Robert P. Madding

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459601
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Modern infrared imaging radiometric cameras typically measure over a nominal waveband within one of two atmospheric windows, 8-12 or 3-5 micrometers. As such, they must assume targets are graybodies to calculate their temperatures. The IR camera can be used to measure target emissivity, enhancing the integrity of the graybody approximation, at least near the temperature at which the emissivity was measured. For realbodies, spectrally nonuniform emitters, the graybody emissivity approximation will be temperature dependent. This paper models the graybody emissivity temperature dependence for a variety of materials whose emissivity may be easily measured near room temperature whilst the application temperatures may be several hundred degrees Celsius.

Citation Download Citation

Robert P. Madding "Temperature dependence of the graybody approximation to emissivity for some common materials", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459601

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