A review of acoustic imaging methods using phased microphone arrays

HIGHLIGHTS

• who: R. Merino-Martu00ednez from the 2., Closedu2011test sections Closed-test sections offer well-controlled aerodynamic properties. Acoustic measurements can be performed nonintrusively by mounting microphones flush in the floor, ceiling, or walls of the wind tunnel. However, the amplitudes of the near-field pressure fluctuations inside the turbulentboundary layer (TBL) are generally much larger than the acoustic signal from the model. Suppression of these nearfield pressure fluctuations can be realized by mounting the microphones in cavities covered by a perforated plate or wire mesh at some distance from the TBL [47-49]. This solution takes advantage . . .
  

   

  

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