Multi-scale analysis of wave propagation and imaging in random

Wave propagation in random media can be studied by multi-scale and stochastic analysis. We first consider the direct problem and show that, in a physically relevant regime of separation of scales, wave propagation is governed by a Schrodinger-type equation driven by a Brownian field. We study the associated moment equations and clarify the propagation of coherent and incoherent waves. Second, using these new results we design original methods for sensor array imaging when the medium is randomly scattering and apply them to seismic imaging and ultrasonic testing of concrete.