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Title Spherical Nearfield Acoustical Holography
Author Moreno, Guillermo
Supervisor Jacobsen, Finn (Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2008
Abstract Spherical near field acoustical holography (SNAH) is a recently developed technique that allows to reconstruct the sound field inside and in the surroundings of a spherical array. Differently from previous works, this thesis presents the theory for SNAH using a rigid spherical array instead of a transparent one. Rigid spheres are also used in Beamforming which focuses on the far field. Due to the near field nature of SNAH there is potential problem of a solid spherical array producing reflections back to the microphones and therefore influencing the reconstructions. Numerical simulations and experimental measurements carried out along this work, illustrate the possible limitations of SNAH using the modified theory for a rigid spherical array. The results obtained from both simulations and experimental measurements show the minimum influence of the reflections in the reconstruction accuracy.
Pages 68
Original PDF Guillermo_Moreno.pdf (2.63 MB)
Admin Creation date: 2009-03-26    Update date: 2009-06-09    Source: dtu    ID: 240723    Original MXD