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Although thermography is suitable for a wide range of inhomogeneities and materials, the fundamental limitation is the diffuse nature of thermal waves and the need to measure their effect radiometrically at the sample surface. The crucial difference between diffuse thermal waves and propagating waves is the rapid degradation of spatial resolution with increasing depth. A promising approach to improve the spatial resolution and thus detection sensitivity and reconstruction quality lies in shaping of these diffuse thermal wave fields. We present the latest results of this technology obtained with lasers, i.e. spatially and temporally structureable heating sources and modern numerical methods.

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