Two different acoustic holography methods for surface vibration reconstruction are compared by experiment: Inverse Boundary Element Method (IBEM) and Planar Near-field Acoustical Holography (PNAH). While IBEM enables the estimation of surface vibration on arbitrary geometries, the PNAH method provides vibration estimates in a plane close to the structure under investigation. Both methods make use of acoustic near-field measurements. The quality of the surface vibration reconstruction from the acoustic holography methods are assessed for an experiment using a vibrating panel and compared to the results from using a Laser Doppler Vibrometry (LDV) method, where a point-by-point sampling of the structure's surface is performed and the vibration directly obtained. Good agreement is found between absolute vibration levels determined by the different non-contact methods.
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