Reconfigurable metasurfaces for directional acoustic sensing

Charles A. Rohde; Mathew D. Guild; Alec K. Ikei; Jeffrey S. Rogers; David C. Calvo; Gregory J. Orris

doi:10.1117/12.2296029

27 March 2018 Reconfigurable metasurfaces for directional acoustic sensing

Charles A. Rohde, Mathew D. Guild, Alec K. Ikei, Jeffrey S. Rogers, David C. Calvo, Gregory J. Orris

Proceedings Volume 10600, Health Monitoring of Structural and Biological Systems XII; 106001I (2018) https://doi.org/10.1117/12.2296029
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

We design and acoustically simulate additively manufactured, flat acoustic membranes (also called metasurfaces) which can be reconfigured into 3-dimentional solids. Using finite element simulations, we design frequency selective acoustic ‘window’ membranes. These transmit narrow frequency bands near flexure resonances. The frequency range of coverage was chosen to be in the audible range and spans from 2,500Hz to 10,000Hz with first order resonances only. We demonstrate selective, non-overlapping acoustic transmission through each membrane window in its flat configuration, and directional selectively when the flat metasurface is folded into the truncated-octahedron with an omnidirectional microphone placed on the interior of the solid form. This work was supported by the Office of Naval Research.

Conference Presentation

Citation Download Citation

Charles A. Rohde, Mathew D. Guild, Alec K. Ikei, Jeffrey S. Rogers, David C. Calvo, and Gregory J. Orris "Reconfigurable metasurfaces for directional acoustic sensing", Proc. SPIE 10600, Health Monitoring of Structural and Biological Systems XII, 106001I (27 March 2018); https://doi.org/10.1117/12.2296029

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