Application of MEMS microphone array for acoustic holography

Regular paper

Zdenek Havranek

Brno University of Technology

Tuesday 2 june, 2015, 11:00 - 11:20

0.8 Rome (118)

The paper shows the overall potential and applicability of microphone arrays equipped with MEMS miniature capacitive microphones for use with near-field acoustic holography algorithms to visualize and localize sound sources. Comprehensive test of double layer rectangular matrix microphone array and several acoustic holography algorithms has been carried out to find weaknesses of proposed MEMS array technology in practical measurement conditions including complex sources and disturbing sound field. Test setups include determination of secondary (disturbing) source strength, influence of distance of the primary and secondary sources, measurement array stand-off distance, prediction plane and virtual source plane position on prediction accuracy of localization and characterization of sound and vibration sources. Attention is also focused on possibilities of MEMS microphone pressure amplitude phase mismatch evaluation and calibration as well as minimization of influence of digital signal processing of digital PDM output of MEMS microphones. Applicability of specific regularization parameter selection methods for sound field prediction based on acoustic holography algorithms for this type of array is also discussed.

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