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Proceedings Paper

Four-color pyrometry for metal emissivity characterization
Author(s): Mark F. Hopkins
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Paper Abstract

Remote measurement of temperature requires thorough knowledge of the surface emissivity characteristics. Emissivity can be thought of as a figure of merit to how closely a material follows a blackbody radiator. The emissivity behavior often has a wavelength dependence and with accurate emissivity prediction, the temperature of a surface can be determined using a passive IR camera. It is both important to create precise emissivity models as well as develop instrumentation that can acquire the data accurately. To develop a model for materials such as metals, it can be observed that the primary contribution to the absorption characteristics can be attributed to the free electron plasma. It can be shown that the emissivity for heated metals in thermal equilibrium can be modeled as a second order polynomial. Consequently, a four color optical pyrometer can be used to accurately determine emissivity profile so that the true temperature can be determined.

Paper Details

Date Published: 19 January 1996
PDF: 8 pages
Proc. SPIE 2599, Three-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology, (19 January 1996); doi: 10.1117/12.230389
Show Author Affiliations
Mark F. Hopkins, Air Force Wright Lab. (United States)

Published in SPIE Proceedings Vol. 2599:
Three-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology
Michael R. Descour; Kevin G. Harding; Donald J. Svetkoff, Editor(s)

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