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    高温固定点的国际研究趋势与发展

    2007-11-14

    摘  要:长期以来,在接触测温学、非接触测温学和辐射度学领域对铜凝固点(1084.62℃)以上高性能温度固定点有着迫切的需求。随着高温金属(碳化物)-碳共晶熔点的发现,这个需求将很快得到满足。本文简要介绍了高温金属(碳化物)-碳共晶固定点的国际研究计划,这个研究的目的是用新的定义替代当前温标ITS-90在银点(961.78℃)以上的定义,使不确定度比当前温标低5-10倍。   关键词:ITS-90;温标;高温固定点;金属-碳共晶点;辐射测温法;校准;复现性;不确定度   中图分类号:TB942  文献标识码:A  文章编号:1672-4984(2007)04-0016-04   Trend and development of international research for high temperature fixed-points CHEN Gui-sheng (National Institute of Measurement and Testing Technologe,Chengdu 610021,China) Abstract: There has been an urgent requirement for high performance fixed-point above the copper freezing point(1084.62℃),in contact thermometry, non-contact thermometry and radiometry for a long term. With the discovery of high temperature metal (carbide)-carbon (M(C)-C) eutectic melting points, this requirement will soon be met. This paper briefly introduced the research project for high temperature metal (carbide)-carbon (M(C)-C) eutectic fixed-points in the world. The purpose of the research is to substitute the current definition of ITS-90 above the silver point(961.78℃) with a new definition, make uncertainty 5-10 times lower than present temperature scale.   Key words: ITS-90; Temperature scale; High performance fixed-point; Metal-carbon(M-C) eutectic points;  Radiation thermometry; Calibration; Reproducibility; Uncertainty


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