Abstract
Until very recently, researchers made most acoustic measurements with a single microphone or possibly a pair of microphones. A single microphone provides an acoustic time history or a pressure spectrum from the acoustic signal received at one spatial location. A pair of microphones adds the ability to measure coherence and acoustic intensity. With the improved performance to cost ratio of electronic equipment and computers, it is now practical for researchers to make acoustic measurements with phased arrays containing many microphones. Measurements made with phased arrays offer the significant benefits of locating sources and making accurate acoustic measurements in adverse environments that contain high background noise levels and/or reflections. This paper describes the basics of array processing, special considerations for aeroacoustic testing in wind tunnels, the current methods used in Ames' 40by 80Foot Wind Tunnel and developments needed to expand the range and usefulness of arrays in aeroacoustic testing.
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