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Microphone array
The position and the strength of sound sources radiated by an aircraft model in the wind tunnel can be measured with a microphone array. By means of a large number of microphones which are usually placed in a two dimensional plane the source distribution on the model can be calculated and illustrated in so called noise maps. These maps provide the possibility to identify dominant noise sources within minutes and are therefore an important noise reduction tool. The measurements with a microphone array can even be performed in wind tunnels with a high background noise level.
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