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

doi:10.3969/j.issn.1000-1158.2024.05.07

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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).

Key words： thermal properties parameter thermal conductivity transient hot-bridge method simulation verification measurement comparison;evaluation of uncertainty

Received: 19 December 2022 Published: 23 May 2024

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TB941

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	Articles by authors
	ZHOU Yi
	PAN Yonggao
	MIN Qitao
	QIU Ping
	YAO Jian
	LI Jun

Cite this article:

ZHOU Yi,PAN Yonggao,MIN Qitao, et al. Measuring Thermal Conductivity of Solid Materials Based on the Transient Hot-bridge Method and Evaluation of the Uncertainty[J]. Acta Metrologica Sinica, 2024, 45(5): 654-665.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2024.05.07 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2024/V45/I5/654

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