What question did this study set out to answer?

The central aim is to assess the effectiveness of infrared thermography in detecting defects in CFRP materials using various excitation and post-processing techniques.

March 6, 2026

Matched Filter Based Post Processing Approach for Active Infrared Thermography for Non-Destructive Testing and Evaluation of Carbon Fibre Reinforced Polymer Materials

Puntos clave

The central aim is to assess the effectiveness of infrared thermography in detecting defects in CFRP materials using various excitation and post-processing techniques.
Utilized halogen lamps as a heat source for infrared thermography.
Implemented three excitation techniques: Pulse Thermography, Lock-in Thermography, and Frequency Modulation Thermal Wave Imaging.
Compared post-processing approaches: Cross-correlation and Frequency Domain Phase on thermal images.
Evaluated techniques using signal-to-noise ratio as a measure of effectiveness.
The Cross-correlation technique consistently outperforms Frequency Domain Phase in improving defect visibility.
Enhanced signal-to-noise ratio values were achieved across all excitation techniques when using Cross-correlation.
Infrared thermography proved to be a reliable method for non-destructive testing of CFRP materials.

Resumen

This research paper investigates the effectiveness of infrared thermography (IRT) in detecting blind holes of varying depth and diameter in Carbon Fiber Reinforced Polymer (CFRP) sample. It utilises halogen lamps as the heat source and implements three excitation techniques: Pulse Thermography (PT), Lock-in Thermography (LT) and Frequency Modulation Thermal Wave Imaging (FMTWI); along with that, it compares two post-processing approaches, Cross-correlation (CC) and Frequency Domain Phase (FDP) on the obtained thermal images. The signal-to-noise ratio (SNR) is considered a figure of merit for evaluating the effectiveness of each technique and its associated post-processing approaches. The results demonstrate that the CC post-processing technique consistently outperforms the FDP method in enhancing defect visibility and improving SNR values across all excitation techniques and configurations. This research highlights the potential of IRT as a reliable, non-destructive testing method for detecting and characterising defects in a chosen CFRP test sample.

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