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Increasing the quality in Acoustic Imaging by working with 2,5D Information Benjamin VONRHEIN1; Gunnar HEILMANN1; Dirk DOEBLER 2 Technical University of Graz, Austria and the University of Applied Arts in Graz, Austria 1gfai tech GmbH, 12489 Berlin, Germany, email@example.com; firstname.lastname@example.org 2GFaI E.V., 12489 Berlin, Germany, email@example.com Abstract Acoustic imaging, especially Delay and Sum Beamforming, has become a standard method in the field of acoustic analysis. Nowadays there are different kind of systems on the market which work with various geometries, channel counts and algorithms. For any of those acoustic imaging systems it is crucial to know the correct distance (focus) to the measurement object. Analyzing data with the wrong distance will result in the incorrect display of levels and sound source positions. Depending on the geometry and microphone distribution systems are more or less sensitive for this effect. There are different approaches to get the correct distance information: with several optical cameras, working with a 3D model or simply measuring it. Each method has its limitations therefore the aim in research is to constantly improve that aspect. This work shows the influence of calculations based on incorrect focus, both on the level and the source localization. Different array geometries will be considered and analyzed according to their behavior regarding the focus. Examples to display the influence of measuring with different types of arrays are presented. The most common ways of finding the right focus are introduced and the limitations are demonstrated. Furthermore a new method to work with 2.5D information is introduced. For this new method a 3D point scanner is connected to beamforming system. The necessary information is automatically transferred to the imaging algorithms. In that way it will be guaranteed, that the correct focus is applied. Furthermore it is possible to analyze sources at different distances simultaneously.
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