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22 March 2021 Programmable piezoelectric acoustic black hole for wavelength control and enhanced sensing
Christopher Sugino, Mustafa Alshaqaq, Alper Erturk
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Proceedings Volume 11588, Active and Passive Smart Structures and Integrated Systems XV; 115880S (2021) https://doi.org/10.1117/12.2585116
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only
Abstract
We present the theoretical and experimental investigation of a piezoelectric metamaterial-based acoustic black hole leveraging programmable shunt circuits. A versatile experimental platform is developed comprising a piezoelectric bimorph beam with 30 unit cells, each with a pair of piezoelectric patches with individually programmable shunt impedance. By varying the impedance applied to each unit cell, the local dispersion properties of the beam can be precisely controlled. In this work, we explore a programmable implementation of an acoustic black hole, in which wave packets are slowed down and compressed in space using a smooth gradient in shunt impedance.
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Christopher Sugino, Mustafa Alshaqaq, and Alper Erturk "Programmable piezoelectric acoustic black hole for wavelength control and enhanced sensing", Proc. SPIE 11588, Active and Passive Smart Structures and Integrated Systems XV, 115880S (22 March 2021); https://doi.org/10.1117/12.2585116
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KEYWORDS
Acoustics
Metamaterials
Wave propagation
Doppler effect
Modulation
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