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Reconstruction of depth profiles of thermal conductivity of case hardened steels using a three-dimensional photothermal technique

机译：使用三维光热技术重建渗碳钢的导热系数深度分布

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摘要

A method of retrieving thermophysical depth profiles of continuously inhomogeneous materials is presented both theoretically and experimentally using laser infrared photothermal radiometry. This method represents the three-dimensional (3D) extension of earlier one-dimensional thermal-wave inverse-problem techniques for reconstructing inhomogeneous thermal-conductivity or diffusivity depth profiles. A 3D theoretical model suitable for characterizing solids with arbitrary continuously varying thermophysical property depth profiles and finite (collimated or focused) laser beam spotsize is developed. A numerical fitting algorithm to retrieve the thermophysical profile was demonstrated with three case hardened steel samples. The reconstructed thermal conductivity depth profiles were found to be well anticorrelated with microhardness profiles obtained with the conventional indenter method.
机译：从理论上和实验上都提出了一种使用激光红外光热辐射法检索连续非均质材料热物理深度分布的方法。此方法代表了较早的一维热波逆问题技术的三维（3D）扩展，用于重建不均匀的热导率或扩散深度剖面。建立了适用于表征具有任意连续变化的热物理性质深度分布和有限（准直或聚焦）激光束斑点大小的固体的3D理论模型。数值拟合算法检索了热物理轮廓，并用三种表面硬化钢样品进行了演示。发现重建的热导率深度轮廓与通过常规压头方法获得的显微硬度轮廓很好地相关。

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  • 来源
    《Journal of Applied Physics》 |2008年第11期|289-297|共9页
  • 作者

    Hong Qu; Chinhua Wang; XinXin Guo; Andreas Mandelis;

  • 作者单位

    Key Laboratory of Modern Optical Technologies of Jiangsu Province, Institute of Modern Optical Technologies, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China;

    Key Laboratory of Modern Optical Technologies of Jiangsu Province, Institute of Modern Optical Technologies, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China;

    Department of Mechanical and Industrial Engineering, Center for Advanced Diffusion-Wave Technologies (CADIFT), University of Toronto, Toronto M5S 3G8, Canada;

    Department of Mechanical and Industrial Engineering, Center for Advanced Diffusion-Wave Technologies (CADIFT), University of Toronto, Toronto M5S 3G8, Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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