Virtual acoustics in inhomogeneous media with single-sided access

A virtual acoustic source inside a medium can be created by emitting a time-reversed point-source response from the enclosing boundary into the medium. However, in many practical situations the medium can be accessed from one side only. In those cases the time-reversal approach is not exact. Here, w...

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Published in:Scientific reports 2018-02, Vol.8 (1), p.2497-7, Article 2497
Main Authors: Wapenaar, Kees, Brackenhoff, Joeri, Thorbecke, Jan, van der Neut, Joost, Slob, Evert, Verschuur, Eric
Format: Article
Language:English
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639/766/25/3927
704/2151/508
Acoustic responses
Acoustics
Earthquakes
Experimental design
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Seismic activity
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description A virtual acoustic source inside a medium can be created by emitting a time-reversed point-source response from the enclosing boundary into the medium. However, in many practical situations the medium can be accessed from one side only. In those cases the time-reversal approach is not exact. Here, we demonstrate the experimental design and use of complex focusing functions to create virtual acoustic sources and virtual receivers inside an inhomogeneous medium with single-sided access. The retrieved virtual acoustic responses between those sources and receivers mimic the complex propagation and multiple scattering paths of waves that would be ignited by physical sources and recorded by physical receivers inside the medium. The possibility to predict complex virtual acoustic responses between any two points inside an inhomogeneous medium, without needing a detailed model of the medium, has large potential for holographic imaging and monitoring of objects with single-sided access, ranging from photoacoustic medical imaging to the monitoring of induced-earthquake waves all the way from the source to the earth’s surface.
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subjects 639/766/25/3927
704/2151/508
Acoustic responses
Acoustics
Earthquakes
Experimental design
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Seismic activity
title Virtual acoustics in inhomogeneous media with single-sided access
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