Determination of the Optimal Wavelength Range for Non-Contact Measurement of Temperature and Emissivity by Multispectral Pyrometry

The aim of this paper is to determine the optimum wavelength interval for non-contact measurement of temperature and emissivity using the least squares method (LSS) in the gray body approximation, where the measurement uncertainties of these parameters will be minimal. Analysis of the statistical uncertainty of the remote temperature measurement reveals that the both uncertainties of the temperature and emissivity measurements have minima at the wavelength close to that of the Wien’s displacement law. The relationship between optimal wavelength, λmin, and temperature, T, is obtained in the paper.