Void Detection in Complex Geometries

We present results from our computational efforts to determine defect characteristics via solution of inverse problems which involve the 2D wave equation in a domain which presents geometric complexities. We develop a technique for determining “optimal” placement of a receiver based on the geometry of the interrogation problem which involves a plane wave pulse and single receiver. A forward simulation of a scenario with an anticipated void is compared to a voidless scenario in a least squares sense to obtain a “visibility map” of the computational domain. The determined placement of the receiver is shown to be effective in reducing optimization iterations for a particular example.