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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 15 — May. 20, 2007
  • pp: 2870–2880

Thermodynamic-temperature determinations of the Ag and Au freezing temperatures using a detector-based radiation thermometer

Howard W. Yoon, David W. Allen, Charles E. Gibson, Maritoni Litorja, Robert D. Saunders, Steven W. Brown, George P. Eppeldauer, and Keith R. Lykke  »View Author Affiliations


Applied Optics, Vol. 46, Issue 15, pp. 2870-2880 (2007)
http://dx.doi.org/10.1364/AO.46.002870


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Abstract

The development of a radiation thermometer calibrated for spectral radiance responsivity using cryogenic, electrical-substitution radiometry to determine the thermodynamic temperatures of the Ag- and Au-freezing temperatures is described. The absolute spectral radiance responsivity of the radiation thermometer is measured in the NIST Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources (SIRCUS) facility with a total uncertainty of 0.15 % ( k = 2 ) and is traceable to the electrical watt, and thus the thermodynamic temperature of any blackbody can be determined by using Planck radiation law and the measured optical power. The thermodynamic temperatures of the Ag- and Au-freezing temperatures are determined to be 1234.956   K   ( ± 0.110   K ) ( k = 2 ) and 1337.344   K ( ± 0.129   K ) ( k = 2 ) differing from the International Temperature Scale of 1990 (ITS-90) assignments by 26 mK and 14 mK , respectively, within the stated uncertainties. The temperatures were systematically corrected for the size- of-source effect, the nonlinearity of the preamplifier and the emissivity of the blackbody. The ultimate goal of these thermodynamic temperature measurements is to disseminate temperature scales with lower uncertainties than those of the ITS-90. These results indicate that direct disseminations of thermodynamic temperature scales are possible.

© 2007 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.6780) Instrumentation, measurement, and metrology : Temperature

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: November 14, 2006
Manuscript Accepted: December 18, 2006
Published: May 1, 2007

Citation
Howard W. Yoon, David W. Allen, Charles E. Gibson, Maritoni Litorja, Robert D. Saunders, Steven W. Brown, George P. Eppeldauer, and Keith R. Lykke, "Thermodynamic-temperature determinations of the Ag and Au freezing temperatures using a detector-based radiation thermometer," Appl. Opt. 46, 2870-2880 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-15-2870

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