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Radiation Properties of IR Calibrators With V-Grooved Surfaces

Published

Author(s)

Leonard M. Hanssen, A Prokhorov, Sergey Mekhontsev

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 non-isothermal 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.
Proceedings Title
Proceedings| 2006
Volume
6205
Conference Dates
April 17-21, 2006
Conference Title
SPIE Defense and Security Symposium

Keywords

blackbody radiators, concentric groves, emissivity, Monte Carlo method, specular-diffuse relection
Created April 1, 2006, Updated February 17, 2017