Volumetric reconstruction of the sound field in a room from arbitrary acousto-optic projections

Acousto-optic sensing methods enable the measurement of sound, using the interaction between sound and light as the sensing principle. Specifically, acousto-optic tomography enables the reconstruction of sound fields across space and time. However, existing reconstruction methods have constrained the applicability of the principle to controlled laboratory conditions, due to various measurement restrictions. In the present study, we make use of a new spatial reconstruction approach that makes it possible to reconstruct a sound field from a set of arbitrary projections, enabling the in situ capture of sound fields in conventional spaces, such as rooms and enclosures. We examine how the proposed approach enables to measure a sound field in a room, and how the sensing principle can be used to reconstruct the sound pressure field, particle velocity vector and the flow of
acoustic intensity in a three-dimensional space. Thus, a complete volumetric reconstruction of the sound field is obtained from sets of arbitrary acousto-optic projection measurements.