Hay B, Zarr R, Stacey C, Sokolov N, Lira-Cortes L, Zhang J, Hammerschmidt U, Filtz J-R, Allard A
Laboratoire National de Métrologie et d'Essais (LNE), Scientific and Industrial Metrology Centre, Paris, France.
National Institute of Standards and Technology (NIST), Engineering Laboratory, Gaithersburg, MD, United States.
Metrologia. 2020;57(1A). doi: 10.1088/0026-1394/57/1a/03003.
Seven National Metrology Institutes (NMIs) from France, United States, United Kingdom, Russia, Mexico, China and Germany participated in an inter-laboratory comparison on thermal conductivity measurements by the Guarded Hot Plate method. This action was part of a series of supplementary inter-laboratory comparisons (including infrared spectral emittance and thermal diffusivity) sponsored by the Consultative Committee on Thermometry (CCT) Task Group on Thermophysical Quantities (TG-ThQ). The objective of this collaborative work was to strengthen the consistency of thermal conductivity measurements carried out worldwide on low conductive materials. Measurements were conducted successively by all participants on the same sets of specimens of insulating materials (mineral wool and expanded polystyrene) at temperatures ranging from 10 °C to 40 °C, according to the International Standard ISO 8302. This protocol aimed to minimize issues of material variability by circulating the same pairs of specimens among the laboratories following the strict format of a round-robin test program. More than 120 data points (combinations of material, thickness and temperature) were compared. 92 % of the data points were in agreement, with differences to weighted mean values less than the expanded uncertainties calculated from the individual NMI uncertainties and uncertainties related to the comparison process.
来自法国、美国、英国、俄罗斯、墨西哥、中国和德国的七个国家计量机构（NMI）参与了一项关于用防护热板法测量热导率的实验室间比对。该活动是由温度计量咨询委员会（CCT）热物理量任务组（TG-ThQ）发起的一系列补充实验室间比对（包括红外光谱发射率和热扩散率）的一部分。这项合作工作的目的是加强全球范围内对低导热材料热导率测量的一致性。所有参与者按照国际标准ISO 8302，在10℃至40℃的温度范围内，先后对同一组绝缘材料（矿棉和发泡聚苯乙烯）试样进行测量。该方案旨在通过按照循环检验程序的严格格式在各实验室之间传递相同的试样对，将材料变异性问题降至最低。比较了120多个数据点（材料、厚度和温度的组合）。92%的数据点一致，与加权平均值的差异小于根据各国家计量机构的单独不确定度以及与比对过程相关的不确定度计算出的扩展不确定度。
