Title :
Transient Thermal Behavior of Eddy-Current Pulsed Thermography for Nondestructive Evaluation of Composites
Author :
Liang Cheng ; Gui Yan Tian
Author_Institution :
Sch. of Electr. & Electron. Eng., Newcastle Univ., Newcastle upon Tyne, UK
Abstract :
Carbon fiber reinforced plastic (CFRP) materials are widely used in aircraft and wind turbine blades due to their low weight and high strength. Surface cracks, impact damages, and delaminations are the most common defects for CFRP composites. In this paper, the principal component analysis (PCA)-based eddy-current pulsed thermography method is proposed to detect and visualize defects from transient thermal images or videos. More specifically, three types of defects are classified based on their transient temperature behaviors using PCA at the pixel levels and optical flow patterns at the image levels. In addition, through feature extraction from optical flow method, the quantitative information about the defects, such as a defective area, is retrieved at the image levels.
Keywords :
carbon fibre reinforced plastics; delamination; eddy current testing; feature extraction; image sequences; impact (mechanical); infrared imaging; principal component analysis; surface cracks; C; aircraft; carbon fiber reinforced plastic materials; composite materials; defective area; delamination; feature extraction; impact damage; nondestructive evaluation; optical flow method; optical flow patterns; pixel level; principal component analysis-based eddy-current pulsed thermography method; surface cracks; transient temperature behaviors; transient thermal behavior; transient thermal images; transient thermal videos; wind turbine blades; Cameras; Coils; Delamination; Educational institutions; Heating; Optical imaging; Principal component analysis; Carbon fiber reinforced plastic (CFRP); crack; delamination; eddy-current pulsed thermography (ECPT); impact damage; optical flow; principal component analysis (PCA);
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2013.2243505