The aeroacoustic laboratory Goettingen (SAG) comprises the advanced aeroacoustic measurement techniques at the Institute of Aerodynamics and Flow Technology in Goettingen including several acoustic microphone arrays, a variety of acoustic sensors, two large data-acquisition systems and a high-speed PIV system. The individual components can be integrated to mobile measurement systems to perform different measurement tasks in the field of aeroacoustic research.
Figure 1 shows the DLR microphone array in the low-speed test facility of Airbus Bremen (B-LSWT). By means of this microphone array sound sources can be localized and quantified on aircraft half models in the closed test section of this industrial wind tunnel (see also: Measuring principle of the Microphone array). The application of the high-speed PIV system to measure the sound velocity non-intrusively is shown in Figure 2.