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

作　　者：周逸 潘永杲 闵琪涛 邱萍[2] 姚建 李峻 ZHOU Yi;PAN Yonggao;MIN Qitao;QIU Ping;YAO Jian;LI Jun(Changzhou Institute of Inspection Testing Standardization and Certification,Changzhou,Jiangsu 213164,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]常州检验检测标准认证研究院,江苏常州213164 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2024年第5期654-665,共12页Acta Metrologica Sinica

基　　金：江苏省市场监督管理局科技计划项目(KJ2023051;KJ196032)。

摘　　要：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U_(rel)=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 of 0.01~150 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 is U_(rel)=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 

分 类 号：TB941[一般工业技术—计量学]