Constraints of emissivity model for multi-wavelength pyrometer

Abstract

In this paper the intrinsic relationship between the equivalence and emissivity is put into evidence, and the related constrains of emissivity are put forward. Using the “secondary measurement method” as an example, some simulated experiments and actual experiments are carried out. Simulated experiments use six classical emissivity models trends vs. wavelength: monotonic rise, monotonic decline, Λ-type, V-type, N-type, and M-type. The experiment results show that the accuracy of the calculation given by the secondary measurement method is unchanged when constraints are added, while the calculation speed is improved by 12–38%. In the actual experiments the calculation speed is improved by 19–27%. These results demonstrate the correctness of the proposed method. The work in this paper is important, and even essential when online true temperature measurements are required.

Keywords

• True temperature
• Multi-wavelength pyrometer
• Constraints of emissivity model