Quantitative validation of Eddy current stimulated thermal features on surface crack
Quantitative validation of Eddy current stimulated thermal features on surface crack
复制标题
表面裂纹涡流激励热特征的定量验证
DOI：
10.1016/j.ndteint.2016.09.002
复制
发表时间：
2017-01-01
影响因子：
4.2
通讯作者：
Tian, Gui Yun
中科院分区：
文献类型：
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作者：
Gao, Bin;Li, Xiaoqing;Tian, Gui Yun
热成像是无损检测和评估（NDT & E）中用于检测和可视化缺陷的成熟技术。所获得的热图像序列包含有价值的信息，在空间，时间和频率域。许多热特征提取方法已被提出来检测和量化缺陷。然而，定量评估和误差分析仍然是一个挑战。在目前的工作中，提出了一种定量分析策略，用于验证各种热特征提取技术的检测性能的基础上涡流激励热成像。采用F分数作为裂纹可检测性的全局定量评价指标。对非铁磁材料裂纹进行了大量的仿真和实验研究，定量验证了该方法的有效性。对裂纹尺寸变化和不同热特征提取方法的可检测性进行了严格的分析。从目前的研究结果中获得的见解可以作为指导其他类型的基于热的NDT & E，以提高缺陷的可见性和可检测性。
Thermography is an established technique in Non-Destructive Testing and Evaluation (NDT & E) for detecting and visualizing defects. The acquired thermal image sequences contain valuable information in the spatial, time and frequency domains. Many thermal feature extraction methods have been previously proposed to detect and quantify defects. However, the quantitative assessment and error analysis remain as challenges. In the present work, a quantitative analysis strategy is proposed for validating detection performance of various thermal feature extraction techniques based on Eddy Current Stimulated Thermography. F-score is adopted as a global quantitative evaluation indicator to assess the crack detectability. The quantitative validation is carried out based on a large number of simulations and experiments for cracks on the nonferromagnetic material. The detectability in relation to the variations in crack size and the different thermal feature extraction methods have been critically analyzed. The insights obtained from the present findings can serve as guidelines to other types of thermal-based NDT & E to improve the defect visibility and detectability.