Determination of thermal diffusivity of opaque materials using the photothermal mirror method
Determination of thermal diffusivity of opaque materials using the photothermal mirror method
复制标题
光热镜法测定不透明材料的热扩散率
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Daniel Caballero
中科院分区：
文献类型：
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作者：
A. Marcano;G. Gwanmesia;M. King;Daniel Caballero
抽象的。提出了一种泵浦探测光热镜（PTM）法测定不透明固体样品的热扩散率。该方法涉及探测光束的失真的检测，该探测光束的反射轮廓受到由聚焦泵浦场的吸收引起的抛光材料表面的光弹性变形的影响。我们测量了Ti，Al，Cu，Sn，Ag和Ni样品的PTM信号的时间依赖性。我们从理论和实验上表明，在第一微秒的信号的时间导数是成比例的热扩散系数的平方根。该方法提供了一个简单的校准和有效的解释实验数据的材料的热扩散系数的灵敏测定。通过测量两种重要的地球物理研究矿物--硅镁石（β-Mg_2SiO_4）和透辉石（MgCaSi_2O_6）的热扩散系数，证明了该技术的适用性。
Abstract. A pump-probe photothermal mirror (PTM) method has been developed to determine the thermal diffusivity of opaque solid samples. The method involves the detection of the distortion of a probe beam whose reflection profile is affected by the photoelastic deformation of a polished material surface induced by the absorption of a focused pump field. We have measured the time dependence of the PTM signal of Ti, Al, Cu, Sn, Ag, and Ni samples. We show theoretically and experimentally that the time derivative of the signal in the first microseconds is proportional to the square root of the thermal diffusivity coefficient. The method affords a simple calibration and efficient interpretation of experimental data for a sensitive determination of the thermal diffusivity coefficient for materials. We demonstrate the applicability of the technique by measuring the thermal diffusivities of wadsleyite (β-Mg2SiO4) and diopside (MgCaSi2O6), two important minerals relevant to geophysical studies.