Full factorial analysis of the accuracy of automated quantification of hidden defects in an anisotropic carbon fibre reinforced composite shell using pulse phase thermography

Infrared thermography (IRT) allows fast and cost-effective inspection of large structures made of carbon fibre reinforced polymer (CFRP) which must be checked for structural integrity after manufacture or during use. Due to its anisotropic and inhomogeneous microstructure, CFRP poses a major challenge for the quantitative determination of defects. In this paper we present a comprehensive full-factorial analysis of IRT data to verify the achievable accuracy of automated quantification of hidden defects of different size, shape and position in an inhomogeneous and anisotropic composite specimen, using pulse phase thermography.