Investigations of defects in ceramic tiles using Double Exposure Digital Holographic Interferometry (DEDHI) technique

Abstract

Glazed ceramic flooring tiles have a protective layer that rests over the material, making them impervious to water and stain penetration. A typical defect found in the ceramic tile is delamination. This paper describes the problem of detecting delamination and defects of typical ceramic tiles by using Double Exposure Digital Holographic Interferometry (DEDHI), as a non-destructive technique. The specimen tiles of different qualities (defected) having dimensions 10 cm × 12 cm are used as the sample tiles. These tiles are subjected to mechanical and thermal stressing and their double exposure digital interferograms are recorded. Digital reconstructed images show various fringe patterns. It is found that the defected samples show the irregularity in the fringe patterns and the shape of the fringes changes accordingly the defect, crack and debonds present in the samples. The compared fringe patterns, with fringe patterns of high quality on ceramic samples give reasonably interesting results.