Abstract
Wave manipulation for cloaking and holography is difficult in practice, because most techniques are limited in bandwidth and their ability to adapt their response to varying incoming wave fields. In this study, acoustic sources on closed surfaces have their responses calculated and fed back in real time, to suppress forward and backward scattering from objects without prior knowledge of the incident wave field. Furthermore, arbitrary virtual objects can be emulated by changing the boundary conditions applied to the surface. The authors demonstrate these active acoustic boundary conditions in a one-dimensional experiment, to perform broadband cloaking and holography in real time.
Highlights
The work described here is motivated by the desire to fully control and manipulate wave fields through their acoustic boundary conditions in a physical wave-propagation experiment
We present an experimental demonstration of acoustic cloaking and holography using immersive boundary conditions (IBCs) in a 1D waveguide
We review the concept of IBCs and introduce the experimental setup allowing for real-time implementation, including a feedback-loop between the physical and virtual domains
Summary
The work described here is motivated by the desire to fully control and manipulate wave fields through their acoustic boundary conditions in a physical wave-propagation experiment. We wish to suppress forward and backward scattering from objects so that each object effectively becomes undetectable. The quest to control boundary conditions has received significant attention across disciplines, ranging from electromagnetics [1], through optics [2] and acoustics [3] to the education and entertainment industry [4,5] and approaches generally fall into two categories: passive and active methods. While passive methods are based on coating the boundary with materials that alter wave-propagation paths, active methods use sources to manipulate incoming and control outgoing waves
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