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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Comparison of two microphone array geometries for surface impedance estimation.

Antoine Richard1, Efren Fernandez-Grande1

  • 1Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark (DTU), Building 352, DK-2800 Kongens Lyngby, Denmark.

The Journal of the Acoustical Society of America
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PubMed
Summary

This study compares two microphone array geometries for estimating surface impedance of acoustic absorbers. Results from numerical and experimental tests guide the selection of optimal array design for accurate sound absorption measurements.

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Area of Science:

  • Acoustics
  • Materials Science
  • Signal Processing

Background:

  • Surface impedance is a critical parameter for characterizing acoustic absorbers.
  • Accurate estimation of surface impedance is essential for designing effective sound-absorbing materials and structures.
  • Microphone arrays offer potential for non-contact, spatially resolved surface impedance measurements.

Purpose of the Study:

  • To compare the performance of a rigid spherical array and a double layer planar array for surface impedance estimation.
  • To evaluate the numerical properties and experimental accuracy of different microphone array geometries.
  • To determine the most suitable array configuration for reliable surface impedance measurements of acoustic absorbers.

Main Methods:

  • Surface impedance estimation by reconstructing the sound field (pressure and particle velocity) on the absorber surface.
  • Utilizing plane wave expansion for sound field reconstruction.
  • Comparative analysis through numerical simulations and experimental validation.

Main Results:

  • Both spherical and planar arrays can estimate surface impedance.
  • The study identified specific numerical and experimental advantages/disadvantages for each array geometry.
  • Performance comparison based on factors like array configuration, spatial sampling, and reconstruction accuracy.

Conclusions:

  • The choice of microphone array geometry significantly impacts the accuracy and reliability of surface impedance estimation.
  • Findings provide guidance for selecting optimal array designs in acoustic measurement applications.
  • This research contributes to improved methods for characterizing sound-absorbing materials.