计量学报2024，Vol.45Issue(5)：654-665,12.DOI:10.3969/j.issn.1000-1158.2024.05.07
基于瞬态热桥法的固体材料导热系数测量及其不确定度的评定
Measuring Thermal Conductivity of Solid Materials Based on the Transient Hot-bridge Method and Evaluation of the Uncertainty
摘要
Abstract
On the basis of Hammerschmidt's establishment of THB theory,the analytical model and correction model of thermal conductivity under constant input current mode were improved,and the structure design and simulation verification of THB measurement sensors were carried out.An experimental setup and system with a measurement range of0.01～150 W/(m·K)were constructed,and the corrected model was verified through measurement.Seven kinds of solid materials such as polystyrene,PMMA and steel 45 were measured by using the experimental device.The uncertainty of the measurement results was evaluated and compared with the measurement results of different instruments.The experimental results show that the measurement repeatability of the experimental device is better than 1.7％,the relative deviation from the reference value is within±5％,and the relative expanded uncertainty of the measurement results Urel=2.94％(k=2).关键词
热物性参数/导热系数/瞬态热桥法/仿真验证/测量比较/不确定度评定Key words
thermal properties parameter/thermal conductivity/transient hot-bridge method/simulation verification/measurement comparison/evaluation of uncertainty分类
通用工业技术引用本文复制引用
周逸,潘永杲,闵琪涛,邱萍,姚建,李峻..基于瞬态热桥法的固体材料导热系数测量及其不确定度的评定[J].计量学报,2024,45(5):654-665,12.基金项目
江苏省市场监督管理局科技计划项目(KJ2023051 （）
KJ196032) （）
