Abstract

A blackbody cavity is developed for continuously measuring the temperature of molten steel, which consists of a cylindrical outer tube with a flat bottom, a coaxial inner tube, and an aperture diaphragm. The ray-tracing approach based on the Monte Carlo method was applied to calculate the effective emissivity for the nonisothermal cavity with a diffuse wall. The influence of the wall temperature distribution on the spectral and total effective emissivity was studied for various cavity geometrical parameters. For a practical blackbody cavity of the temperature sensor used in the tundish, the average spectral effective emissivity was calculated and verified. Our results will help optimize the novel sensor design and use it better for measuring the temperature of molten steel.

© 2015 Optical Society of America

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