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Evaluation of anisotropic thermal diffusivity for resin sheet by a laser spot periodic heating radiation thermometry method

机译：激光光斑周期性加热辐射温度法评价树脂片对树脂片的各向异性热扩散性

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A laser spot periodic heating radiation thermometry method is an effective measurement method for plate-like or sheet-shaped samples. This measurement method is an epoch -making measurement method capable of measuring the out of plane direction and the in -plane direction of the sample and has made it possible to measure various samples In this measurement method, spot heating is performed with a laser which periodically intensity-modulates the surface of a plate-shaped sample, and the thermal diffusivity of resin sheet is measured by measuring the temperature change on the back surface of the sample with an infrared radiation thermometer. In addition, thermal diffusivity in the in-plane direction and out of plane direction of the sample can be measured independently by controlling the positional relationship between the heating point and the detection point [1]. When measuring the thermal diffusivity of resin by measurement method using laser heating, the power of heating laser must be sufficiently small to prevent damage of the sample due to heat. On the other hand, resins generally have low thermal conductivity, so that signal attenuation is large. And therefore, it is difficult to obtain a sufficient signal and the distance between the heating point and the detection point. In the case of measuring the thermal diffusivity in the in-plane direction, although the influence of the thermal diffusivity in the out of plane direction and thickness of the sample can be ignored by sufficiently separating the distance between the heating point and the detection point, because of previously described reasons, it is difficult to sufficiently separate the distance between the heating point and the detection point. Since the detection region also has a finite size, it is necessary to consider the size of the detection region [2, 3]. In addition, since the thermal diffusivity of the resin is low, consideration of heat leak to the surroundings might also be necessary. Thermal diffusivity was calculated by analytical formula considering the size of the detection region and the thermal diffusivity in the out of plane and thickness of the sample. Moreover, in order to evaluate the influence of heat leak to the surroundings, the measurement results in vacuum and in the atmosphere were compared. It was found that the obtained result of the thermal diffusivity for resin sheet was close to the literature value [4]. It was also found that the measured value in the air was larger than the measured value in a vacuum, suggesting the effect of heat leak to the atmosphere.
机译：激光光斑周期性加热辐射温度方法是板状或片状样品的有效测量方法。该测量方法是能够测量样品的平面方向和血换方向的跨纪念制造方法，并且已经使得可以在该测量方法中测量各种样品，通过周期性地使用激光进行点加热。强度调节板状样品的表面，通过用红外辐射温度计测量样品的后表面上的温度变化来测量树脂片的热扩散率。另外，通过控制加热点和检测点之间的位置关系，可以独立地测量面内方向和样品的平面方向的热扩散率。当使用激光加热测量树脂的热扩散性时，加热激光器的功率必须足够小以防止由于热引起的样品损坏。另一方面，树脂通常具有低导热率，因此信号衰减大。因此，难以获得足够的信号和加热点与检测点之间的距离。在测量面内方向上的热扩散率的情况下，尽管通过充分分离加热点和检测点的距离，可以忽略热扩散率在样品的厚度中的热扩散率和样品的厚度的影响，但是由于先前描述的原因，难以充分地分离加热点和检测点之间的距离。由于检测区域还具有有限尺寸，因此需要考虑检测区域的尺寸[2,3]。另外，由于树脂的热扩散率低，因此也可能需要对周围环境的热泄漏。考虑到检测区域的尺寸和样品的厚度中的检测区域的尺寸和热扩散率，通过分析公式计算热扩散率。此外，为了评估热泄漏对周围环境的影响，比较测量结果，比较了真空和大气中的测量。发现树脂片的热扩散率的所得结果接近文献值[4]。还发现空气中的测量值大于真空中的测量值，表明热泄漏到大气的影响。

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