Abstract
The present study investigated crack visualization in metallic structures using time-domain reflectometry (TDR) with a two-dimensional (2D) microstrip line (MSL). The inspected structures acted as the ground layer of the MSL, and a film sensor comprising dielectrics and a microstrip conductor was stuck on the surface of the inspected structures. 2D inspection was enabled by covering the inspected structure surface with the microstrip conductor to compensate for the lack of information in the transverse direction. Crack visualization experiments were conducted using the proposed TDR with 2D MSL for different crack lengths and positions. The experimental results demonstrated that crack propagation could be clearly visualized.
