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Radiative Properties of Blackbody Calibration Sources: Recent Advances in Computer Modeling

Published

Author(s)

A Prokhorov, Sergey Mekhontsev, Leonard Hanssen

Abstract

The radiative characteristics (spectral effective emissivity, spectral radiance, and radiance temperature) of blackbody calibration sources widely used in radiation thermometry are an important subject for advanced computer modeling by the Monte Carlo method. An algorithm and code for stochastic modeling of the radiant heat transfer inside cavities has been developed on the basis of the reciprocity principle and backward ray tracing. The importance sampling technique has been applied to generate the reflected rays according to the surface reflection model that can be a linear combination of the following primary models: Lambertian, Specular, and TETRA (microfacet model of random tetrahedral pits that mimics reflections from rough surface).A wide range of axisymmetrical cavities, cylindrical cavities with an inclined flat bottom, and a rectilinear grooved radiator of polygonal profile have been implemented. Various types of conditions of observation can be modeled to compute appropriate radiation characteristics. A number of different temperature distributions can be assigned to the same node set on the cavity surface, so several kindred tasks can be modeled in a single run.
Citation
International Journal of Thermophysics

Keywords

blackdoby, BRDF, emissivity, Monte Carlo Method, ray tracing

Citation

Prokhorov, A. , Mekhontsev, S. and Hanssen, L. (2021), Radiative Properties of Blackbody Calibration Sources: Recent Advances in Computer Modeling, International Journal of Thermophysics (Accessed May 20, 2022)
Created October 12, 2021