Ahmadi Samim, Lecompagnon Julien, Hirsch Philipp Daniel, Burgholzer Peter, Jung Peter, Caire Giuseppe, Ziegler Mathias
Bundesanstalt für Materialforschung und -prüfung (BAM), 12200, Berlin, Germany.
Research Center for Non Destructive Testing, 4040, Linz, Austria.
Sci Rep. 2020 Dec 21;10(1):22357. doi: 10.1038/s41598-020-77979-y.
A photothermal super resolution technique is proposed for an improved inspection of internal defects. To evaluate the potential of the laser-based thermographic technique, an additively manufactured stainless steel specimen with closely spaced internal cavities is used. Four different experimental configurations in transmission, reflection, stepwise and continuous scanning are investigated. The applied image post-processing method is based on compressed sensing and makes use of the block sparsity from multiple measurement events. This concerted approach of experimental measurement strategy and numerical optimization enables the resolution of internal defects and outperforms conventional thermographic inspection techniques.
提出了一种光热超分辨率技术，用于改进内部缺陷检测。为了评估基于激光的热成像技术的潜力，使用了一个具有紧密间隔内部空腔的增材制造不锈钢试样。研究了透射、反射、逐步扫描和连续扫描四种不同的实验配置。所应用的图像后处理方法基于压缩感知，并利用了多次测量事件中的块稀疏性。这种实验测量策略和数值优化的协同方法能够实现内部缺陷的分辨率，并且优于传统的热成像检测技术。
