The Method of Two-Colour Pyrometry of True Temperature with Unknown Emissivity

摘要

A new pyrometric method (and an experimental two-colour pyrometer to realize this method) is suggested for measuring the spectral emissivity during heating and cooling. The method is based on the utilization of the effect of the temperature dependence of emissivity. The method involves the use of relative laser reflectometry, which does not require the validity of Lambert's law. The results of measurements of the emissivity of tungsten, rhenium, and tantalum using the suggested pyrometer are given.