Three-channel wide-spectrum temperature measurement technique

Abstract

A theoretical and experimental study of a three-channel wide-spectrum temperature measurement technique is reported. The correctness of the application of the Taylor series to the temperature measurement integral equations is verified theoretically, and the effect of spectral emissivity on the approximation of the Taylor series is discussed. In the simulation results, the insensitivity of the optimal expansion wavelength to the spectral emissivity is revealed and applied as an important basis in the temperature solution method. Temperature measurement experiments using the two-color method and three-channel wide spectrum method were carried out. The theoretical correctness of the three-channel wide-spectrum temperature measurement method and the spatial solution ability of the temperature field are verified.