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14 May 2018 Numerical simulation of phase images and depth reconstruction in pulsed phase thermography
Saul Hernandez Valle, Kara Peters
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Proceedings Volume 10661, Thermosense: Thermal Infrared Applications XL; 106610M (2018) https://doi.org/10.1117/12.2301959
Event: SPIE Commercial + Scientific Sensing and Imaging, 2018, Orlando, FL, United States
Abstract
In this work we apply the finite element (FE) method to simulate the results of pulsed phase thermography experiments on laminated composite plates. Specifically, the goal is to simulate the phase component of reflected thermal waves and therefore verify the calculation of defect depth through the identification of the defect blind frequency. The calculation of phase components requires a higher spatial and temporal resolution than that of the calculation of the reflected temperature. An FE modeling strategy is presented, including the estimation of the defect thermal properties, which in this case is represented as a foam insert impregnated with epoxy resin. A comparison of meshing strategies using tetrahedral and hexahedral elements reveals that temperature errors in the tetrahedral results are amplified in the calculation of phase images and blind frequencies; we investigate the linearity of the measured diffusion length (based on the blind frequency) as a function of defect depth. The simulations demonstrate a nonlinear relationship between the defect depth and diffusion length, calculated from the blind frequency, consistent with previous experimental observations. And finally a two-point strategy is presented to better estimate the defect depth and thickness.
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Saul Hernandez Valle and Kara Peters "Numerical simulation of phase images and depth reconstruction in pulsed phase thermography ", Proc. SPIE 10661, Thermosense: Thermal Infrared Applications XL, 106610M (14 May 2018); https://doi.org/10.1117/12.2301959
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KEYWORDS
Thermography
Composites
Thermal modeling
Wave propagation
Heat flux
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