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Proceedings Paper

Radiation properties of IR calibrators with V-grooved surfaces
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Paper Abstract

Use of linear or concentric grooves is a well-known approach for increasing the surface emissivity to enable the construction of compact blackbody radiators, improve absorptance of stray radiation traps, baffles and thermal radiation detectors, as well as enhance thermal radiation transfer. Emitters with V-grooved surfaces are widely used as reference sources in radiation thermometry and radiometry. In the design phase of such devices, it is important to predict their performance. Most existing models are devoted to modeling isothermal linear grooves with purely diffuse or specular reflectance. Radiation behavior of concentric grooves differs from linear ones and becomes similar only for large values of the ratio of the radial coordinate to the groove period. This paper covers numerical modeling of isothermal and nonisothermal concentric grooves with mixed specular-diffuse reflection for various viewing conditions using Monte Carlo specialized software. It is shown that the temperature drop towards the peak of a groove might lead to a substantial decrease of the grooves' effective emissivity.

Paper Details

Date Published: 18 April 2006
PDF: 9 pages
Proc. SPIE 6205, Thermosense XXVIII, 620505 (18 April 2006); doi: 10.1117/12.667557
Show Author Affiliations
Alexander V. Prokhorov, National Institute of Standards and Technology (United States)
Leonard M. Hanssen, National Institute of Standards and Technology (United States)
Sergey N. Mekhontsev, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 6205:
Thermosense XXVIII
Jonathan J. Miles; G. Raymond Peacock; Kathryn M. Knettel, Editor(s)

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