A deep learning approach based defect visualization in pulsed thermography

Sethu Selvi Selvan (M.S. Ramaiah Institute of Technology)
Sharath Delanthabettu (M.S. Ramaiah Institute of Technology)
Menaka Murugesan (Indira Gandhi Center for Atomic Research)
Venkatraman Balasubramaniam (Indira Gandhi Center for Atomic Research)
Sathvik Udupa (M.S. Ramaiah Institute of Technology)
Tanvi Khandelwal (M.S. Ramaiah Institute of Technology)
Touqeer Mulla (M.S. Ramaiah Institute of Technology)
Varun Ittigi (M.S. Ramaiah Institute of Technology)

IAES International Journal of Artificial Intelligence (IJ-AI)
Vol 11, No 3: September 2022

Non-destructive evaluation (NDE) is very essential in measuring the properties of materials and in turn detect flaws and irregularities. Pulsed 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 PT. 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 (PLSR) thermography. Experimental results show that AE approach provides better SNR at the cost of defect detectability.