摘要
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。
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.
作者
朱俊臻
冯辅周
汪子君
何鹏
李志农
ZHU Jun-zhen;FENG Fu-zhou;WANG Zi-jun;HE Peng;LI Zhi-nong(Key Laboratory of Nondestructive Testing(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China;Department of Vehicle Engineering,Army Academy of Armored Forces,Beijing 100072,China;School of Aeronautics and Astronautics,University of Electronic Science and Technology of China,Chengdu 611731,China;Exercise and Training Centre,Army Academy of Armored Forces,Beijing 100072,China)
出处
《失效分析与预防》
2021年第5期287-294,299,共9页
Failure Analysis and Prevention
基金
国家自然科学基金(52005510,51875576,61905038)
无损检测技术教育部重点实验室开放基金(EW201980445)。
关键词
涡流脉冲热像
长脉冲光热像
亚表面缺陷检测
图像增强
图像分割
eddy current pulsed thermography
long pulse optical thermography
subsurface-defect detection
image enhancement
image segmentation
