Emissivity measurement and temperature correction accuracy considerations

Robert P. Madding

doi:10.1117/12.342307

19 March 1999 Emissivity measurement and temperature correction accuracy considerations

Robert P. Madding

Proceedings Volume 3700, Thermosense XXI; (1999) https://doi.org/10.1117/12.342307
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

Extraction of temperatures or temperature differences with thermography is not possible without knowledge of the target emissivity. As the technology of thermography evolves, many applications from predictive maintenance through R&D projects have increasingly stringent requirements for quality temperature measurement. Today's IR cameras and software can correct for target emissivity variations on a point-by-point basis or over the entire image. One problem is how to measure emissivity, and how emissivity measurement uncertainties propagate to temperature uncertainties. This paper discusses emissivity measurement techniques, why table values are often not valid for a particular IR camera (why you must measure emissivity) and how emissivity measurement accuracy affects temperature measurement accuracy (error budget for opaque targets).

Citation Download Citation

Robert P. Madding "Emissivity measurement and temperature correction accuracy considerations", Proc. SPIE 3700, Thermosense XXI, (19 March 1999); https://doi.org/10.1117/12.342307

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