This paper deals with recent advances in acoustic experimental methods and especially acoustic imaging. The paper covers two areas of interest to acousticians. In the first part, it is explained how near-field acoustic holography (NAH) can be extended with beamforming in the near-field, focalization. The combination of the two methods is providing now a source localization solution with a good spatial resolution over the complete frequency range without the burden of measuring a large number of points as would be required if only NAH was used. In the second part of the paper, a method is described that goes one step beyond source localization. It is interesting to locate the noise sources, but from an engineering standpoint it is even more interesting to know the internal sources/forces causing these noise sources. In this part is explained how source localization techniques in conjunction with artificial excitation of the structure can provide information on the internal sources of the structure.

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METRAVIB R.D.S., the French leader in the field of dynamics in mechanics (vibrations-materials-acoustics) is one of the pioneers of the development and application of acoustical imaging techniques in France (intensitymetry-holography-backpropagation). Associated today with the main French and European industrial groups, METRAVIB R.D.S. has validated its methods in various real industrial applications. This paper presents an overview of these applications either on fixed or moving sources, focusing on theoretical foundations of the selected resolution methods, and knowledge acquired through these techniques. Moreover, this paper deals with the most recent applications to related fields such as structural intensitymetry techniques, and experimental investigation of periodic stiffened structures. The conclusions are devoted to developments in progress, concerning phenomena studies of fluid-structures coupling by means of radiation or scattering fields exploration.