Calibration Facilities for High Temperature Radiation Thermometers at NMIJ

National Metrology Institute of Japan (NMIJ/AIST) realizes and disseminates standard temperature scale at high temperature for radiation thermometry. The calibration facilities consist of fixed-point blackbodies, spectral responsivity measurement system and so on. The characterization facilities consist of the size-of-source effect measuring system and distance effect measuring system. Their specifications and measurement methods are described.