Reconstruction of depth profiles of thermal conductivity of case hardened steels using a three-dimensional photothermal technique
Reconstruction of depth profiles of thermal conductivity of case hardened steels using a three-dimensional photothermal technique
复制标题
使用三维光热技术重建表面硬化钢导热系数的深度分布
DOI：
10.1063/1.3035831
复制
发表时间：
2008-12-01
影响因子：
3.2
通讯作者：
Mandelis, Andreas
中科院分区：
文献类型：
--
作者：
Qu, Hong;Wang, Chinhua;Mandelis, Andreas
提出了一种利用激光红外光热辐射测量法从理论上和实验上检索连续非均质材料的热物理深度剖面的方法。该方法代表了早期一维热波反问题技术的三维 (3D) 扩展，用于重建不均匀热导率或扩散率深度剖面。开发了一种 3D 理论模型，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）激光束光斑尺寸的固体。使用三个表面硬化钢样品演示了检索热物理曲线的数值拟合算法。发现重建的热导率深度剖面与传统压头方法获得的显微硬度剖面有很好的反相关性。
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.