ABSTRACT

In this paper, an environmental barrier coating (EBC), which has undergone thermal cycling under spatiotemporal gradients, is inspected using active thermography. The technique considered herein is known as laser spot thermography. This study deals with the detection of a very thin crack network of unknown orientation. A numerical analysis is presented to investigate the sensitivity of experimental parameters on the detection. Image processing using a Laplacian operator combined with histogram equalisation to mitigate optical defects is then proposed to construct a cartography that is similar to scanning electron microscopy (SEM) observations despite the very adverse conditions.

摘要

在本文中，使用主动热成像技术检查了在时空梯度下经历了热循环的环境屏障涂层（EBC）。本文考虑的技术称为激光点热成像。这项研究涉及检测未知方向的非常薄的裂纹网络。进行了数值分析，以研究实验参数对检测的敏感性。然后提出了使用拉普拉斯算子与直方图均衡化相结合来减轻光学缺陷的图像处理技术，以构建制图，尽管条件非常不利，但其类似于扫描电子显微镜（SEM）的观察结果。