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Measuring Thermal Conductivity of Solid Materials Based on the Transient Hot-bridge Method and Evaluation of the Uncertainty |
ZHOU Yi1,PAN Yonggao1,MIN Qitao1,QIU Ping2,YAO Jian1,LI Jun1 |
1.Changzhou Institute of Inspection Testing Standardization and Certification, Changzhou, Jiangsu 213164, China
2.National Institute of Metrology, Beijing 100029, China
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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 of 0.01~150W/(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 Urel=2.94%(k=2).
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Received: 19 December 2022
Published: 23 May 2024
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