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首页> 外文期刊>Journal of Applied Physics >Photothermal characterization of the thermal properties of materials using four characteristic modulation frequencies in two-layer systems
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Photothermal characterization of the thermal properties of materials using four characteristic modulation frequencies in two-layer systems

机译：在两层系统中使用四个特征调制频率对材料的热性质进行光热表征

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摘要

A simple photothermal methodology for determining simultaneously and in four different ways the thermal diffusivity and thermal effusivity of the illuminated layer in a two-layer system is presented. The method is based on the analysis of the photothermal signal of the whole system normalized by the corresponding signal of the illuminated one-layer system. Our approach uses the modulation frequencies at which the normalized amplitude (phase) passes through unity (zero) and reaches its maximum (minimum). It is shown that these four characteristic modulation frequencies are independent of the thermal effusivities of the layers, and their values can be used to obtain the thermal diffusivity of the illuminated layer. Then, by using the exact complex expression of the normalized photothermal signal with the experimental data for its amplitude and phase, the thermal effusivity of the same layer can be found. In order to show the usefulness of this approach, the method is applied to a glassy carbon sample in thermal contact with three different types of very thick back layers of air, water, and glycerine. It is shown that the highest (lowest) accuracy on the measurement of the thermal properties corresponds to the frequency at which the zero (minimum) of the normalized phase occurs.
机译：提出了一种简单的光热方法，该方法可以同时并以四种不同的方式确定两层系统中照明层的热扩散率和热发射率。该方法基于对整个系统的光热信号的分析，该光热信号被照明的单层系统的相应信号归一化。我们的方法使用归一化幅度（相位）经过单位（零）并达到其最大值（最小）的调制频率。示出了这四个特征调制频率与层的热效率无关，并且它们的值可以用于获得被照射层的热扩散率。然后，通过使用归一化光热信号的精确复数表达式及其幅度和相位的实验数据，可以找到同一层的热效率。为了显示此方法的有用性，该方法适用于与三种不同类型的空气，水和甘油非常厚的背层热接触的玻璃碳样品。结果表明，热性能测量的最高（最低）准确度对应于归一化相位为零（最小）的频率。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.064909.1-064909.7|共7页
  • 作者

    C. Vales-Pinzon; J. Ordonez-Miranda; J. J. Alvarado-Gil;

  • 作者单位

    Departamento de Fisica Aplicada, Centro de Investigation y de Estudios Avanzados del IPN-Unidad Merida, Carretera Antigua a Progreso km. 6, A.P. 73 Cordemex, Merida, Yucatan 97310, Mexico;

    Departamento de Fisica Aplicada, Centro de Investigation y de Estudios Avanzados del IPN-Unidad Merida, Carretera Antigua a Progreso km. 6, A.P. 73 Cordemex, Merida, Yucatan 97310, Mexico;

    Departamento de Fisica Aplicada, Centro de Investigation y de Estudios Avanzados del IPN-Unidad Merida, Carretera Antigua a Progreso km. 6, A.P. 73 Cordemex, Merida, Yucatan 97310, Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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