Nondestructive testing of concrete with electromagnetic and elastic waves: Modeling and imaging

The theory of acoustic, electromagnetic and elastic wave fields in terms of governing equations, plane waves, spherical waves (Green functions) and scattered field representations is discussed under common aspects leading to a unified derivation of modeling and imaging algorithms. The latter require a linearization of the inverse scattering problem. Applications referring to the location and assessment of tendon ducts in concrete are presented utilizing synthetic as well as experimental data culminating in a real-life example for data taken from a bridge.