Broadband acoustic invisibility and illusions

Rendering objects invisible to impinging acoustic waves (cloaking) and creating acoustic illusions (holography) has been attempted using active and passive approaches. While most passive methods are inflexible and applicable only to narrow frequency bands, active approaches attempt to respond dynami...

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Bibliographic Details
Published inScience advances Vol. 7; no. 37; p. eabi9627
Main Authors Becker, Theodor S, van Manen, Dirk-Jan, Haag, Thomas, Bärlocher, Christoph, Li, Xun, Börsing, Nele, Curtis, Andrew, Serra-Garcia, Marc, Robertsson, Johan O A
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 10.09.2021
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Summary:Rendering objects invisible to impinging acoustic waves (cloaking) and creating acoustic illusions (holography) has been attempted using active and passive approaches. While most passive methods are inflexible and applicable only to narrow frequency bands, active approaches attempt to respond dynamically, interfering with broadband incident or scattered wavefields by emitting secondary waves. Without prior knowledge of the primary wavefield, the signals for the secondary sources need to be estimated and adapted in real time. This has thus far impeded active cloaking and holography for broadband wavefields. We present experimental results of active acoustic cloaking and holography without prior knowledge of the wavefield so that objects remain invisible and illusions intact even for broadband moving sources. This opens previously inaccessible research directions and facilitates practical applications including architectural acoustics, education, and stealth.
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ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.abi9627