Development of large-area high-temperature fixed-point blackbodies for photometry and radiometry
作者： Boris Khlevnoy , Irina Grigoryeva , Klaus Anhalt , Martin Waehmer , Evgeniy Ivashin
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摘要: Large-area high-temperature fixed-point (HTFP) blackbodies with working temperatures of approximately 2748 K and 3021 K, based on an Re–C eutectic a WC–C peritectic respectively, have been developed investigated. The emissivity 0.9997, show high-quality phase-transition plateaus high repeatability the melting temperatures, but demonstrate temperature differences (from 0.2 to 0.6 K) compared small-cell same HTFP. We associate these drop effect, which may differ from cell cell. large radiating cavity diameter 14 mm allows HTFP be used for photometric radiometric applications in irradiance mode uncertainties as small 0.12% (k = 1) visible. A photometer irradiance-mode filter radiometer (visible range), previously calibrated at VNIIOFI, were measure illuminance equipped precise outer aperture. values measured by detectors agreed those blackbody calculation within 0.2%. large-area will joint PTB–VNIIOFI experiment measuring thermodynamic temperature.
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