IR-C AND RE-C FIXED-POINT BLACKBODIES' SPECTRAL RADIANCE REPRODUCIBILITY AT 650 nm

摘要

Measurements of the reproducibility of spectral radiance at 650 nm of the fixed-point blackbodies based on high-temperature eutectics Ir-C and Re-C were carried out. The obtained reproducibility for the Ir-C eutectic blackbody was 0.006% and 0.007% (1σ) for the melting and the freezing points, respectively. For Re-C blackbody the corresponding values were 0.004% and 0.01%. The variation of the spectral radiance at 650 nm of Ir-C and Re-C at melting and freezing points was found to be equal to 0.01-0.02% for a wide range of the heating and cooling rates.