NDLI: Study and Comparison of Newly Developed ITS-90 Silver- and Copper-Point Cells

Content Provider	Springer Nature Link
Author	Bourson, F. Sadli, M. Rougié, B. Briaudeau, S.
Copyright Year	2011
Abstract	For realization of the ITS-90, LNE-INM uses a series of Cu and Ag fixed-point blackbody cavities and a monochromator-based radiance comparator or linear pyrometers. As for the field of contact thermometry where, for every particular fixed point, the national reference is represented by a batch of fixed-point cells, the decision was made to construct multi-purpose Cu and Ag cells which can be implemented in various types of furnaces depending on their size. The cells are to be compared, on a semi-annual or annual basis, to detect any unexpected drift of one of the cells in order to discard it. In this study, the constructed cells, of different types and dimensions (three sizes for the Cu point and two sizes for the Ag point) have been extensively implemented and characterized in different furnaces of different temperature uniformity capabilities. The temperature differences between the cells, although small, are analyzed and the effects of the temperature drop as well as the emissivity are estimated. The uncertainty budget for the realization of these fixed points, as well as the effects on the extrapolation to the highest temperatures, is investigated. In this paper, a description of the cells and the furnaces used will be given and the results of the characterization of the cells and their comparison will be presented.
Starting Page	1602
Ending Page	1610
Page Count	9
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	7-8
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-04-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Emissivity Fixed points ITS-90 Temperature drop Industrial Chemistry/Chemical Engineering Physical Chemistry Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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Thermodynamic Temperatures of High-Temperature Fixed Points: Uncertainties Due to Temperature Drop and Emissivity

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Comparison at NMIJ/AIST of the Triple Point of Neon Using Different Sealed Cells

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