A Deep Learning Approach based Defect Visualization in Pulsed Thermography

S Sethu Selvi

Abstract


Non-destructive evaluation (NDE) is very essential in measuring the properties of materials and in turn detect flaws and irregularities. Pused Thermography (PT) is one of the advanced NDE technique which is used for detecting and characterizing subsurface defects. Recently many methods have been reported to enhance the signal and defect visibility in Pulsed Thermography In this paper, a novel unsupervised deep learning-based Auto-encoder (AE) approach is proposed for enhancing the Signal to Noise Ratio (SNR) and visualize the defects clearly. A detailed theoretical background of AE and its application to PT is discussed. The SNR and defect detectability results are compared with the existing approaches namely, Higher Order Statistics (HOS), Principal Component Thermography (PCT) and Partial Least Square Regression Thermography (PLS). Experimental results show that AE approach provides better SNR at the cost of defect detectability.   

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DOI: http://doi.org/10.11591/ijai.v11.i3.pp%25p

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