Journal
FRONTIERS IN PHYSICS
Volume 11, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2023.1240468
Keywords
acoustic metamaterial; weak sound sensing; gradient structure; phononic crystal; impedance matching
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This work proposes a phononic crystal gradient metamaterial structure (PCGMs) for the enhancement and directional sensing of weak target acoustic signals using the strong wave compression effect and equivalent medium theory. Compared to conventional gradient structures, PCGMs exhibit superior acoustic enhancement performance and wider range of acoustic response capability. Numerical analysis and experimental validation consistently demonstrate that PCGMs can effectively enhance the target frequency signals in harmonic signals, breaking through the detection limit of acoustic sensing systems and providing a great method for engineering applications of weak acoustic signal perception.
In this work, a phononic crystal gradient metamaterial structure (PCGMs) is proposed based on the strong wave compression effect coupled with equivalent medium theory to achieve enhancement and directional sensing of weak target acoustic signals. Compared with the conventional gradient structure, PCGMs exhibit superior acoustic enhancement performance and wider range of acoustic response capability. Numerical analysis and experimental validation consistently demonstrate that PCGMs can effectively enhance the target frequency signals in harmonic signals. This study breaks through the detection limit of acoustic sensing systems and provides a great method for engineering applications of weak acoustic signal perception.
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