Experimental Procedure to Assess Depth and Size of Defects with Pulsed Thermography

Abstract Subsurface defects can be detected by the pulsed thermography (PT) technique analysing raw thermal data with application of different post-processing algorithms. In this regard, methods, based on one-dimensional models, are used in literature to estimate depth and size defects. Two most established methods signal reconstruction (TSR) phase (PPT) These latter require a careful set up testing parameters such as frame rate, truncation window size, energy density obtain an accurate estimation both depths sizes Even if some works have already investigated issue defect characterization, there few which correct procedures were deeply explained, above all for real components The aim work is propose new empirical procedure using particular principal component (PCT) algorithm. proposed experimental observation that exists linear correlation between contrasts relative aspect ratios. way, means master specimen, calibration curve obtained considering suitable analysed data. Then, been retrieved imposing threshold criteria. quite general, it also tested other Different tests carried out two materials, aluminium glass fiber reinforced polymer (GFRP) then has applied validated simulated (flat bottom holes)