Inverse source identification techniques are used to find the acoustic sources on the surface of a sound radiating object. One of the most general applicable methods is the inverse frequency response function method (IFRF). The standard IFRF technique uses acoustic pressure measurements performed on a measurement grid in the nearfield of an acoustic source to determine the corresponding normal velocities on the surface of the source. To relate the measured fieldudpressures to the surface vibrations, a transfer matrix is calculated with a boundary element solver (BEMSYS). In the source localization process, this matrix needs to be inverted in order to predict the original surface normal velocities. Generally, the transfer matrix is ill-conditioned and can only be solved by applying regularization techniques. In this paper, apart from conventional pressure measurements, it is investigated whether the nearfield particle velocities, measured with a Microflown sensor, can be used to reconstruct the original source vibrations. By means of an experimental setup, a comparison is made between pressure based and velocity based IFRF.
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