激光连续加热二维光热超分辨率重建检测内部缺陷
Thermographic detection of internal defects using 2D photothermal super resolution reconstruction with sequential laser heating
摘要：
热成像光热超分辨率重建使内部缺陷/不均匀性的分辨率低于经典极限，这是由热波传播的扩散特性。基于特殊采样策略的应用和随后的后处理中的数值优化步骤的组合，热成像超分辨率已经被证明在一维缺陷/不均匀结构的检测中优于标准热成像方法。在我们的工作中，我们报告了一个扩展的能力的方法，有效地检测和分辨率的缺陷横截面与完全二维结构化的激光加热。重建是使用两种不同的算法，这是在这项工作中提出的。这两种算法利用几个相干测量的组合，使用凸优化和利用稀疏性质的缺陷/不均匀性，是典型的大多数无损检测方案。最后，每个算法的性能进行了评级的重建质量和算法的复杂性。所提出的实验方法是基于高功率激光的重复空间结构加热。结果，可以获得二维稀疏缺陷/不均匀性图。此外，所获得的结果进行了比较与传统的热成像检测方法，利用均匀照明。由于重构的缺陷/不均匀性图的稀疏性质，定性地执行该比较。
英文摘要：
Thermographic photothermal super resolution reconstruction enables the resolution of internal defects/inhomogeneities below the classical limit which is governed by the diffusion properties of thermal wave propagation. Based on a combination of the application of special sampling strategies and a subsequent numerical optimization step in post-processing, thermographic super resolution has already proven to be superior to standard thermographic methods in the detection of one-dimensional defect/inhomogeneity structures. In our work, we report an extension of the capabilities of the method for efficient detection and resolution of defect cross sections with fully two-dimensional structured laser-based heating. The reconstruction is carried out using one of two different algorithms which are proposed within this work. Both algorithms utilize the combination of several coherent measurements using convex optimization and exploit the sparse nature of defects/inhomogeneities as is typical for most nondestructive testing scenarios. Finally, the performance of each algorithm is rated on reconstruction quality and algorithmic complexity. The presented experimental approach is based on repeated spatially structured heating by a high power laser. As a result, a two-dimensional sparse defect/inhomogeneity map can be obtained. In addition, the obtained results are compared with those of conventional thermographic inspection methods which make use of homogeneous illumination. Due to the sparse nature of the reconstructed defect/inhomogeneity map, this comparison is performed qualitatively.
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