In physical acoustic laboratories, wave propagation experiments often suffer from unwanted reflections at the boundaries of the experimental setup. We propose using multidimensional deconvolution (MDD) to post-process recorded experimental data such that the scattering imprint related to the domain boundary is completely removed and only the Green's functions associated with a scattering object of interest are obtained. The application of the MDD method requires in/out wavefield separation of data recorded along a closed surface surrounding the object of interest, and we propose a decomposition method to separate such data for arbitrary curved surfaces. The MDD results consist of the Green's functions between any pair of points on the closed recording surface, fully sampling the scattered field. We apply the MDD algorithm to post-process laboratory data acquired in a two-dimensional acoustic waveguide to characterize the wavefield scattering related to a rigid steel block while removing the scattering imprint of the domain boundary. The experimental results are validated with synthetic simulations, corroborating that MDD is an effective and general method to obtain the experimentally desired Green's functions for arbitrary inhomogeneous scatterers.
Bibliographical noteKAUST Repository Item: Exported on 2021-03-23
Acknowledgements: We would like to thank Professor Kees Wapenaar and an anonymous reviewer for their positive and constructive comments. We thank the Mondaic team for their support in using the salvus software package. We thank Professor Lasse Amundsen and Professor Andrew Curtis for the discussion about MDD work in exploration geophysics. We thank Dr. Marc Serra-Garcia for the discussion about comsol. We would like to thank Thomas Haag and Christoph Bärlocher for setting up the acquisition system in the laboratory. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 694407).
ASJC Scopus subject areas
- Acoustics and Ultrasonics