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首页> 外文期刊>Measurement Science & Technology >Feature extraction using normalized cross-correlation for pulsed eddy current thermographic images
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Feature extraction using normalized cross-correlation for pulsed eddy current thermographic images

机译：使用归一化互相关的脉冲涡流热像图特征提取

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摘要

Pulsed eddy current (PEC) thermography is an emerging method in the field of non-destructive testing and evaluation (NDT&E). Defects can be characterized by tracking the diffusion of heat in a sample through the analysis of a sequence of PEC thermographic images. This study takes advantage of the capabilities of PEC thermography to gain quantitative information about complex geometrical defects, i.e. angular defect characterization through the analysis of the surface thermal distribution. To conduct the analysis, a new approach using a normalized cross-correlation technique is proposed. The strength of the proposed approach lies in its ability to track the heat diffusion through sequential PEC thermographic images in a metallic sample. The results of the analysis are used to determine the dimensions of defects in the sample under test. These results have shown the effectiveness of the proposed technique in providing features which have good agreement with defect detection and evaluation.
机译：脉冲涡流（PEC）热成像技术是无损检测和评估（NDT＆E）领域中的一种新兴方法。可以通过分析一系列PEC热成像图像来跟踪样品中的热扩散来表征缺陷。这项研究利用了PEC热成像的功能来获取有关复杂几何缺陷的定量信息，即通过分析表面热分布来表征角度缺陷。为了进行分析，提出了一种使用归一化互相关技术的新方法。所提出的方法的优势在于它能够通过金属样品中连续的PEC热成像图像跟踪热扩散的能力。分析结果用于确定被测样品中缺陷的尺寸。这些结果表明，所提出的技术在提供与缺陷检测和评估具有良好一致性的特征方面是有效的。

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