Structural health monitoring: Subsurface defects detection

In this paper, the operation of the non-destructive inspection on composite structures has been investigated. The pitch/catch swept is used to detect the designed flaws of the laminated composite structures. Characteristics of the different types of defect are inspected. The signal processing is applied to the collected data to extract the defect information. The smallest detectable defect size is found to be approximately the size of the probe used. The results based on several defects are presented and compared.