This paper reports the first comprehensive results obtained from a fully functional, recently established infrared spectral emissivity capability at National Institute of Standards and Technology (NIST). First, sample surface temperatures are obtained with a radiometer using actual emittance values from a newly designed sphere reflectometer and a comparison between the radiometer temperatures and contact thermometers is presented. Spectral emissivity measurements are further made by comparison of the sample spectral radiance to that of a reference blackbody at a similar (but not identical) temperature. Initial materials selected for measurement are potential candidates for use as spectral emissivity standards or are of particular technical interest. Temperature-resolved measurements of the spectral directional emissivity of SiC, and Pt-10Rh have been measured in the spectral range of 2 - 20 m, over a temperature range of 300 C up to 900 C at normal incidence. Further, a careful study of the uncertainty components of this measurement is presented.
Citation: International Journal of Thermophysics
Pub Type: Journals
infrared, platinum-10%rhodium, silicon-carbide, spectral emissivity, spectral emittance, sphere reflectomer