涡流脉冲热像与长脉冲光热像对铝板中亚表面缺陷检测的对比研究

作为两种新兴的无损检测与评估技术，涡流脉冲热像和长脉冲光热像已广泛应用于多种场合。针对两种技术检测铝平板类结构中存在的亚表面缺陷，开展试验对比研究。在利用主成分分析和K-means聚类实现增强和提取缺陷信息的基础上，定量对比两种热像技术检测不同尺寸人工平底洞缺陷的性能。试验结果表明，涡流脉冲热像和长脉冲光热像分别能从18个缺陷中检测出14个和12个。此外，涡流脉冲热像对埋藏较浅的缺陷更具检测优势而长脉冲光热像对孔径较大的缺陷检测效果更好。

Comparative Study of Eddy Current Pulsed Thermography and Long Pulse Optical Thermography for Subface-defect Detection in Aluminum Plat

Eddy current pulsed thermography (ECPT) and long pulse optical thermography (LPOT) as two emerging nondestructive testing and evaluation (NDT & E) techniques have been widely used for defect evaluation in many scenarios. This paper focuses on detecting subsurface defects in an aluminium plate by using both techniques. Principal component analysis and K-means clustering are used to enhance and extract artificial flat bottom hole (FBH) defects with different sizes. Results show that ECPT can detect 14 out of 18 FBHs, whereas LPOT can detect 12 out of 18 FBHs. Additionally, ECPT outperforms LPOT for detecting shallower FBHs and LPOT has an advantage in detecting FBHs with larger diameters.