H J Jung 1986 Metrologia 23 19 doi:10.1088/0026-1394/23/1/003
H J Jung
Show affiliationsA pyrometric method and appropriate black bodies are described for the accurate measurement of thermodynamic temperature above 683 K (410 °C). The pyrometer employs unbiased low-noise silicon detectors of linear response and a dielectric multi-cavity interference filter of 40 nm halfwidth with a sharply-edged band pass. The effective wavelength equals about 974 nm. Special emphasis has been given to determine and to minimize the errors due to temperature gradients inside a black body that is controlled to a very stable temperature T68 utilizing platinum resistance thermometers.
The difference ΔT = T - T68 between thermodynamic and practical temperatures at the antimony point (630.74 °C) was measured to be - 0.150 K ± 22 mK. From 683 K to 903 K the difference ΔT is expressed by the empirical least-squares fit ΔT = T - T68 = a1 + a2 T68; a1 = 0.2154 K; a2 = - 0.4038 × 10-3. The thermodynamic temperature of the aluminium point has been determined as 933.452 K ± 24 mK. The overall uncertainties are given at the 99% confidence level.
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
Issue 1 (1986)
Received 31 August 1985
H J Jung 1986 Metrologia 23 19
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