Time reversal mirror: Temporal and spatial focusing tool

Abstract

Time reversal is a technique to focus waves, both temporally and spatially, through an inhomogeneous medium. The incident pressure wave is time reversed and re-transmitted from an array of transducers to focus the pressure on a source or at a point target which may be reflective. This array of sensors is called time reversal mirror (TRM). In this paper, we have studied the spatial and the temporal focusing properties of different TRM array geometries. Two dimensional as well as three dimensional geometries for different configurations and environment have been studied. It has been found that there exists optimal array configuration for both temporal and spatial focusing.