Acousto-optic sensing of acoustic fields

This is a recording of an Acoustics Lunchtime Research Seminar given by Samuel Verburg of DTU to the Salford Acoustics Group on the 16th March 2022.
Abstract:
The characterization of sound fields over space is fundamental in acoustics. Yet, the acquisition of sound fields using conventional electromechanical transducers is challenging due to the high sampling requirements. In this study, we introduce an acousto-optic sensing method to sample acoustic fields using a sparse set of optical measurements. Acousto-optical methods, which are based on the interaction between sound waves and light, have recently drawn significant attention, since they allow for remote, non-intrusive sampling of acoustic fields with fine spatial resolution.
The practical deployment of optical sensing in acoustics, however, has been hindered by the unsuitability of existing methods to reconstruct sound fields. The proposed methodology relies on projecting the measured data on a set of plane wave functions, which alleviates the measurement requirements associated with traditional reconstruction methods, and makes it possible to calculate the sound pressure, particle velocity, and intensity fields. We demonstrate the approach experimentally by reconstructing the three-dimensional sound field inside a room, as well as in the vicinity of a vibrating plate. These results are key to advancing the use of acousto-optical sensing methods, which are currently limited to simplified domains.
Biography:
Samuel A. Verburg studied engineering acoustics at the Technical University of Denmark (DTU) and received his MSc degree in 2017. From 2018 to 2021 he has worked towards a PhD degree in spatial sensing and reconstruction of acoustic fields at the Acoustic Technology group (DTU). He is currently working as a postdoc within the same group. His research interests include optical methods in acoustics, sound field reconstruction and visualization, acoustic holography, spatial sampling, and sparse signal processing.

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