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Determining the thermal diffusivity and the principal directions on anisotropic moving samples with laser-spot thermography

机译:用激光点热成像确定各向异性移动样品上的热扩散性和主方向

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摘要

We propose a method to measure the thermal diffusivity of (an)isotropic samples moving at constant speed using laser-spot thermography with continuous illumination. The method does not require previous knowledge of the principal directions and can be applied whichever their orientation with respect to the direction of motion. We demonstrate analytically that any radial temperature profile crossing the center of the laser spot fulfills a linear relation with the distance to the laser spot, whose slope depends on the thermal diffusivity, on the sample speed and on the angle of the profile with respect the sample motion. A multi-linear fitting of the temperature profiles at several angles provides a reliable method to obtain the thermal diffusivity. Experiments performed on reference samples, both isotropic and anisotropic, confirm the validity of the method to provide accurate and precise thermal diffusivity values and to identify the thermal principal directions.
机译:我们提出了一种测量使用激光点热成像以恒定的照射以恒定速度移动的(AN)各向同性样品的热扩散率的方法。 该方法不需要先前的主体方向知识,并且可以以其相对于运动方向的定向应用。 在分析上,通过对激光斑点的中心的任何径向温度曲线展示,其与激光光斑的距离的线性关系,其斜率取决于热扩散率,在样本速度和曲线上的角度相对于样品上的角度 运动。 以几个角度的温度轮廓的多线性配合提供了一种获得热扩散率的可靠方法。 在参考样品中进行的实验,各向同性和各向异性,证实了方法的有效性,以提供准确和精确的热扩散值并识别热主主体。

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