2-D real-time quantitative microwave imaging of reinforcement bars: simulations and experiments

This paper treats the non-destructive localisation of reinforcement bars. It introduces a quantitative algorithm using a Gauss-Newton-type optimization to determine the radius and position of one reinforcement bar in a homogeneous medium from data collected with a bi-static linear measurement setup. The use of the linear sampling method as a preprocessing step and a fast analytical 2D model for the direct problem results in a robust and quasi-realtime microwave imaging system. Reconstructions from both simulated and experimental data are presented.