Issue << content << NDT Study of Complex CFRP/GFRP Structure by Means of Active Thermography


DOI: 10.12737/18044

2016. Vol.19. No. 1, pp. 18-20

NDT Study of Complex CFRP/GFRP Structure by Means of Active Thermography

J. M. Poplawski

Introduction. The active thermography requires an external energy source to induce a temperature gradient; internal flaws act as infinite resistance to heat conduction. The study was fulfilled to determine detectability of the flaws in complex CFRP/GFRP structures using active thermography.
Method. The calibration plate with Teflon inserts as artificial defects was tested. The standard configuration of the NDTherm® NT system was used together with the specially developed algorithm for enhancing the contrast via special time compression and polynomial fit to ensure noise reduction.
Results. The Teflon inserts were clearly seen under 16 layers of hybrid structure. It took less than 5 minutes to run measurements.
Conclusion. The results have shown that this noncontact method is quick, reliable and cost-effective. The Opgal NDTherm® Technology and product line has shown enhanced detection capabilities in various applications.
 
Keywords: active thermography, CFRP/GFRP structure, image processing, detection algorithm, heat transfer
References
1. Crank J. The Mathematics of Diffusion. 2nd Edition. Oxford Science Publications. — Oxford: Clarendon Press, 1975.
2. Shepard S. M. Advances in pulsed thermography. In: Proc. SPIE 4360, Thermosense XXIII, 511 (March 23, 2001); DOI:10.1117/12.421032; http://dx.doi.org/10.1117/12.421032.
 
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