Radiation properties of IR calibrators with V-grooved surfaces

Alexander V. Prokhorov; Leonard M. Hanssen; Sergey N. Mekhontsev

doi:10.1117/12.667557

18 April 2006 Radiation properties of IR calibrators with V-grooved surfaces

Alexander V. Prokhorov, Leonard M. Hanssen, Sergey N. Mekhontsev

Proceedings Volume 6205, Thermosense XXVIII; 620505 (2006) https://doi.org/10.1117/12.667557
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

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.

Citation Download Citation

Alexander V. Prokhorov, Leonard M. Hanssen, and Sergey N. Mekhontsev "Radiation properties of IR calibrators with V-grooved surfaces", Proc. SPIE 6205, Thermosense XXVIII, 620505 (18 April 2006); https://doi.org/10.1117/12.667557

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