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Characterisation of thermal property of materials by infrared thermography

机译：红外热成像法表征材料的热性能

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An infrared thermography is used for non-contact characterisations of thermal properties of materials. In the experiment, a pulsed laser is used to excite a transient thermal source in the material, and an infrared camera system is used to record the infrared thermal images of the subsequent heat diffusion and heat loss processes. In the theory, by a solving heat conduction equation, a two-dimensional thermal distribution function produced by the pulsed laser excitation can be obtained. Then, based on the relations between both the two-dimensional thermal distribution functions extracted at any two times, the thermal diffusivities and heat loss rates of the materials can be obtained by fitting the theoretical calculations to the infrared images recorded at different times. The results indicate that this method is useful to determine the thermal diffusivity and thermal loss for industrial non-metallic materials with rough surfaces and/or inhomogeneous microstructures.
机译：红外热成像技术用于材料热特性的非接触式表征。在实验中，脉冲激光用于激发材料中的瞬态热源，红外摄像头系统用于记录后续热扩散和热损失过程的红外热图像。在理论上，通过求解热传导方程，可以获得由脉冲激光激发产生的二维热分布函数。然后，基于任意两次提取的二维热分布函数之间的关系，可以通过将理论计算与在不同时间记录的红外图像进行拟合，来获得材料的热扩散率和热损失率。结果表明，该方法可用于确定具有粗糙表面和/或不均匀微观结构的工业非金属材料的热扩散率和热损失。

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