Measurement of thermal diffusivity and conductivity of thin films using laser-line lock-in thermography

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2025-08-01 Epub Date: 2025-04-09 DOI:10.1016/j.ijthermalsci.2025.109928

Agustín Salazar, Arantza Mendioroz

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Abstract

Laser-line lock-in thermography consists in illuminating the sample surface with a modulated and focused laser beam and recording the spatial distribution of the temperature oscillations with an infrared camera. In this work we show that it is possible to measure the thermal diffusivity and conductivity of thin films. When the sample is in vacuum, both amplitude and phase of the temperature oscillations behave as a linear functions of the distance to the center of the illumination, and the thermal diffusivity can be obtained from their slopes. When the thin film is surrounded by air, the linearity of amplitude and phase is lost due to the influence of heat conduction to the air. In this case, the thermal conductivity of the material can be obtained by fitting the complete theoretical model (which includes all the heat transfer mechanisms) to the recorded experimental temperature profiles. Validation is performed on two thin films of different thermal transport properties.

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用激光线锁定热成像技术测量薄膜的热扩散率和电导率

激光线锁定热成像是用调制聚焦的激光束照射样品表面，并用红外摄像机记录温度振荡的空间分布。在这项工作中，我们证明了测量薄膜的热扩散率和电导率是可能的。当样品处于真空状态时，温度振荡的振幅和相位都与到照明中心的距离成线性关系，热扩散系数可以由它们的斜率得到。当薄膜被空气包围时，由于对空气的热传导影响，振幅和相位的线性丧失。在这种情况下，材料的导热系数可以通过将完整的理论模型（包括所有的传热机制）拟合到记录的实验温度曲线中来获得。在两种不同热输运性质的薄膜上进行了验证。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.