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Debonding defect detection in TBC structures with different coating thicknesses by pulse and long-pulse thermography: a comparative study
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DOI：10.1080/01694243.2026.2672522.png)
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Abstract
En 中文
Active thermography is a rapid, contactless nondestructive evaluation (NDE) method commonly used for thermal barrier coatings (TBCs). This study provides a systematic comparison of PT and LPT for three TBC thicknesses (100, 200, and 300 μm) with artificial debonding defects of different diameters and depths. It evaluates the performance of advanced thermal signal processing techniques. In addition to conventional thermographic signal reconstruction (TSR), principal component analysis (PCA), and derivative methods, we introduce and validate a combined TSR + background deletion (TSR+BD) approach optimized for noisy PT and LPT data. Results show that LPT detects more defects on average (33.3 versus 16.5 for PT), but PT benefits more from signal processing improvements. All processing methods enhance the results, with TSR+BD outperforming the others. This method increased the signal-to-noise ratio (SNR) in both PT and LPT tests by 92% and 55%, respectively. It also increased the number of detected defects by 420% and 42%, respectively. Even after applying signal processing techniques, LPT still outperformed PT. The analysis further explains how coating thickness, defect size and depth, and thermal diffusion limits influence detection, clarifying why 2 mm defects remained undetectable.
Keywords:
Pulse thermography
nondestructive testing
thermal barrier coating
debonding defect
thermographic signal reconstruction
principal component analysis
Journal
J
IF:
3.7
Papers:
340
Citations:
6.8K
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Cited Papers