Terahertz-Based Nondestructive Testing of Ceramic Matrix Composites

Ceramic Matric Composites are the most promising candidates for high-temperature applications in space and defense industries. However, the strength of these composites is dependent on the porosity, and hence, the study of change in porosity with high-temperature exposure is crucial. Here, THz-time domain spectroscopy has been adopted in reflection mode to extract the porosity of the composite samples. Further, the nondestructive testing capabilities in terms of identification of different types of defects, namely delamination and induced crack, have been performed using the THz continuous wave imaging system, with distinct contrast delineating the areas of defect in the acquired images.