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Performance analysis of the transient thermo-reflectance method for measuring the thermal conductivity of single layer materials

机译:瞬态热反射法测量单层材料导热系数的性能分析

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摘要

This work shows that the Fourier number (Fo) defines the shape and amplitude of the thermal response of a semi-infinite layer sample. The introduction of the responsivity, Rs, of the TTR method provides the ability to assess the performance of the thermal conductivity measurements. A simplified heat transfer analysis of a finite layer sample revealed that the properties ratio, (ρC_pK)_S/(ρC_pK)_L, and the layer thickness, h/δ_P, uniquely define both temperature response and measurement responsivity. If the material under test is the substrate, this work can help improve the measurement accuracy by selecting the appropriate thickness of the top layer. If the material is a layer on top of a known substrate, this work suggests that the accuracy of the TTR measurements can be fully maximized.
机译:这项工作表明傅立叶数(Fo)定义了一个半无限层样品的热响应的形状和幅度。 TTR方法的响应度Rs的引入提供了评估热导率测量性能的能力。有限层样品的简化传热分析表明,特性比(ρC_pK)_S /(ρC_pK)_L和层厚度h /δ_P分别定义了温度响应和测量响应度。如果被测材料为基材,则可以通过选择适当的顶层厚度来帮助提高测量精度。如果材料是已知基板顶部的一层,则这项工作表明TTR测量的精度可以完全最大化。

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