Estimation of surface impedance using different types of microphone arrays

Antoine Philippe André Richard, Efren Fernandez Grande, Jonas Brunskog, Cheol-Ho Jeong, Karim Haddad, Jørgen Hald, Woo-Keun Song

    Research output: Contribution to journalConference abstract in journalResearchpeer-review


    This study investigates microphone array methods to measure the angle dependent surface impedance of acoustic materials. The methods are based on the reconstruction of the sound field on the surface of the material, using a wave expansion formulation. The reconstruction of both the pressure and the particle velocity leads to an estimation of the surface impedance for a given angle of incidence. A porous type absorber sample is tested experimentally in anechoic conditions for different array geometries, sample sizes, incidence angles, and distances between the array and sample. In particular, the performances of a rigid spherical array and a double layer planar array are examined. The use of sparse array processing methods and conventional regulariation approaches are studied. In addition, the influence of the size of the sample on the surface impedance estimation is investigated using both experimental data and numerical simulations with a boundary element model. Results indicate that the small distance between the planar array and the sample favors a more robust estimation.
    Original languageEnglish
    JournalJournal of the Acoustical Society of America
    Issue number5
    Pages (from-to)3842
    Publication statusPublished - 2017
    Event173rd Meeting of the Acoustical Society of America / 8th Forum Acusticum - Boston , United States
    Duration: 25 Jun 201729 Jun 2017
    Conference number: 173 / 8


    Conference173rd Meeting of the Acoustical Society of America / 8th Forum Acusticum
    Number173 / 8
    Country/TerritoryUnited States


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