Image processing based quantitative damage evaluation in composites with long pulse thermography
By Zijun Wang, Guiyun Tian, Michele Meo, Francesco Ciampa. NDT & E international, 2018
140 citations recorded by the source corpus.
Abstract Pulsed thermography is a contactless and rapid non-destructive evaluation (NDE) technique that is widely used for the inspection of fibre reinforced plastic composites. However, pulsed thermography uses expensive and specialist equipment such high-energy flash lamps to generate heat into the sample, so that alternative thermal stimulation sources are needed. Long pulse thermography was recently developed as a cost-effective solution to enhance the defect detectability in composites by generating step-pulse heat into the test sample with inexpensive quartz halogen lamps and measuring the thermal response during the material cooling down. This paper provides a quantitative comparison of long pulse thermography with traditional pulsed thermography and step heating thermography in carbon fibre and glass fibre composites with flat-bottomed holes located at various depths. The three thermographic methods are processed with advanced thermal image algorithms such as absolute thermal contrast, thermographic signal reconstruction, phase Fourier analysis and principal component analysis in order to reduce thermal image artefacts. Experimental tests have shown that principal component analysis applied to long pulse thermography provides accurate imaging results over traditional pulsed thermography and step heating thermography. Hence, this inspection technique can be considered as an efficient and cost-effective thermographic method for low thermal conductivity and low thermal response rate materials.
Subfields: Civil and Structural Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/494e2904beceab9b48a948312cbba9182665bee4
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In Civil and Structural Engineering
In Mechanics of Materials
Citations in the corpus
- Successes and challenges in non-destructive testing of aircraft composite structures (2020, methodology): “However, in pulse thermography data is affected by problems such as non-uniform heating, environmental reflections and surface geometry and therefore more advanced signal and image processing techniques are needed as reported in.(145,146) Therefore, different techniques such as heat conductionbased ”