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Proceedings Paper

Variable-angle directional emissometer for moderate-temperature emissivity measurements
Author(s): A. R. Ellis; H. M. Graham; Michael B. Sinclair; J. C. Verley
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Paper Abstract

We have developed a system to measure the directional thermal emission from a surface, and in turn, calculate its emissivity. This approach avoids inaccuracies sometimes encountered with the traditional method for calculating emissivity, which relies upon subtracting the measured total reflectivity and total transmissivity from unity. Typical total reflectivity measurements suffer from an inability to detect backscattered light, and may not be accurate for high angles of incidence. Our design allows us to vary the measurement angle (θ) from near-normal to ~80°, and can accommodate samples as small as 7 mm on a side by controlling the sample interrogation area. The sample mount is open-backed to eliminate shine-through, can be heated up to 200 °C, and is kept under vacuum to avoid oxidizing the sample. A cold shield reduces the background noise and stray signals reflected off the sample. We describe the strengths, weaknesses, trade-offs, and limitations of our system design, data analysis methods, the measurement process, and present the results of our validation of this Variable-Angle Directional Emissometer.

Paper Details

Date Published: 29 August 2008
PDF: 9 pages
Proc. SPIE 7065, Reflection, Scattering, and Diffraction from Surfaces, 706508 (29 August 2008); doi: 10.1117/12.796507
Show Author Affiliations
A. R. Ellis, Sandia National Labs. (United States)
H. M. Graham, Lockheed Martin Aeronautics Co. (United States)
Michael B. Sinclair, Sandia National Labs. (United States)
J. C. Verley, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 7065:
Reflection, Scattering, and Diffraction from Surfaces
Zu-Han Gu; Leonard M. Hanssen, Editor(s)

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