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OA北大核心CSTPCD
Measuring Thermal Conductivity of Solid Materials Based on the Transient Hot-bridge Method and Evaluation of the Uncertainty
在Hammerschmidt建立瞬态热桥(THB)法理论的基础上,改进了恒定输入电流模式下导热系数解析模型和修正模型,对THB测量传感器进行了结构设计和仿真验证.搭建了测量范围为0.01～150 W/(m·K)的实验装置,并对修正模型进行了测量验证.对聚苯乙烯、有机玻璃和45号钢等7种固体材料进行了实验测量,对测量结果进行了不确定度的评定,并与不同仪器的测量结果进行了比较.结果表明,实验装置的测量重复性优于1.7％,与参考值的相对偏差在±5％以内,经评定测量结果的相对扩展不确定度为Urel=2.94％(k=2).
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).
周逸;潘永杲;闵琪涛;邱萍;姚建;李峻
常州检验检测标准认证研究院,江苏常州 213164中国计量科学研究院,北京 100029
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
thermal properties parameterthermal conductivitytransient hot-bridge methodsimulation verificationmeasurement comparisonevaluation of uncertainty
《计量学报》 2024 (005)
654-665 / 12
江苏省市场监督管理局科技计划项目(KJ2023051;KJ196032)
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