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首页> 外文期刊>Optical engineering >Determination of thermal diffusivity of opaque materials using the photothermal mirror method
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Determination of thermal diffusivity of opaque materials using the photothermal mirror method

机译：用光热镜法测定不透明材料的热扩散率

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摘要

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-Mg_2SiO_4) and diopside (MgCaSi_2O_6), two important minerals relevant to geophysical studies.
机译：已经开发了泵探针光热镜（PTM）方法来确定不透明固体样品的热扩散率。该方法包括检测探测光束的畸变，该探测光束的反射轮廓受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。我们已经测量了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，信号在第一微秒内的时间导数与热扩散系数的平方根成正比。该方法为敏感地确定材料的热扩散系数提供了简单的校准和对实验数据的有效解释。我们通过测量瓦兹利石（β-Mg_2SiO_4）和透辉石（MgCaSi_2O_6）（与地球物理研究相关的两种重要矿物）的热扩散率，证明了该技术的适用性。

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  • 来源
    《Optical engineering》 |2014年第12期|127101.1-127101.6|共6页
  • 作者

    Aristides Marcano; Gabriel Gwanmesia; Mark King; Daniel Caballero;

  • 作者单位

    Delaware State University, Optical Science Center for Applied Research, 1200 North DuPont Highway, Dover, Delaware 19901, United States,Delaware State University, Department of Physics and Engineering, 1200 North DuPont Highway, Dover, Delaware 19901, United States;

    Delaware State University, Department of Physics and Engineering, 1200 North DuPont Highway, Dover, Delaware 19901, United States;

    Delaware State University, Optical Science Center for Applied Research, 1200 North DuPont Highway, Dover, Delaware 19901, United States,Delaware State University, Department of Physics and Engineering, 1200 North DuPont Highway, Dover, Delaware 19901, United States;

    Delaware State University, Optical Science Center for Applied Research, 1200 North DuPont Highway, Dover, Delaware 19901, United States,Delaware State University, Department of Physics and Engineering, 1200 North DuPont Highway, Dover, Delaware 19901, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    photothermal mirror; photothermal effects; determination of thermal diffusivity;

    机译：光热镜光热效应;热扩散率的测定;

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