On the Uncertainty in the Temperature Drop across the Backwall of High-Temperature Fized Points
(0) In this paper we evaluate △T, the temperature drop across the cavitys backwall, and its standard uncertainty u(△T) for the high-temperature eutectic fixed points Co-C, Pt-C and Re-C with eutectic temperatures TE of 1597 K, 2011 K and 2747 K, respectively; the evaluation involves a variety of cavity-furnace geometries. For the derivation of u(△T) the partial uncertainties in △T associated with the uncertainties in the thermal conductivity Kg of graphite, in the cavity-wall emissivity εg and in the furnace-temperature profile ahead of the cavity are evaluated and quantified. △T is shown to vary with TE4 for a given cell-furnace configuration, with typical values of 12 mK, 25 mK and 92 mK at the Co-C, Pt-C and Re-C fixed-point temperatures, respectively. For the uncertainty in the temperature drop we find globally u(△T)=0.1. △T.
Metrology Temperature drop Fized points High-Temperature Sensitivity coefficients Uncertainty
P.Castro P.Bloembergen Y.Yamada M.A.Villamanan G.Machin
University of Valladolid, Spain Formerly at NMIJ, AIST, Japan NMIJ, AIST, Japan NPL, UK
国际会议
2008年国际温度与热物性测量会议(TEMP BEIJING 2008)
北京
英文
253-260
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）