Acoustic Holography with a Concentric Rigid and Open Spherical Microphone Array

摘要

We present a new method and performance data related to volumetric acoustic intensity imaging using a spherical microphone array (SMA) that consists of a dual, concentric rigid and open SMA. The dual, concentric array was designed to improve the frequency range of a standard SMA. We apply standard techniques associated with interior spherical near-field acoustic holography (NAH) and, in particular, consider issues related to the optimal use of information from both arrays for NAH projection and the advantages that thereby accrue from utilizing a dual, concentric SMA.