Contactless measurement of the spectral emissivity and temperature of surfaces with a Fourier transform infrared spectrometer

摘要

Abstract: A method for the measurement of the spectral emissivity and temperature of a surface is presented. The spectrum of the infrared radiation of a heated surface is measured by means of a Fourier transform infrared spectrometer. To obtain emission spectra in units of spectral radiance a special calibration procedure is described which uses three black bodies as reference sources, thus eliminating the need to measure the black bodies' surface temperature. A theoretical emission spectrum of the investigated surface's radiance is fitted to the calibrated measurement resulting in (in the Gaussian sense) optimal values of spectral emissivity and temperature of the surface.!10