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Refractive acoustic devices for airborne sound
F Cervera1, L Sanchis, J V Sánchez-Pérez
1Centro Tecnológico de Ondas, Unidad Asociada de Investigación (CSIC-UPV), Edificio de Institutos II, Universidad Politécnica de Valencia, E-46022 Valencia, Spain.
Sonic crystals, periodic arrangements of cylinders, enable new refractive acoustic devices for airborne sound. These crystals transmit sound at subsonic speeds, similar to optical systems.
Area of Science:
- Acoustics
- Materials Science
- Wave Physics
Background:
- Periodic structures can manipulate wave propagation.
- Sonic crystals offer unique acoustic properties.
Purpose of the Study:
- To demonstrate sonic crystals as a novel material for refractive acoustic devices.
- To explore the acoustic properties of sonic crystals in the long-wave regime.
Main Methods:
- Fabrication and characterization of a convergent acoustic lens.
- Analysis of a Fabry-Perot interferometer using a sonic crystal.
Main Results:
- Sonic crystals exhibit low impedance for airborne sound transmission.
- Subsonic sound velocities are achieved within the crystal.
- Demonstrated feasibility of acoustic lenses and interferometers.
Conclusions:
- Sonic crystals function as a new class of acoustic metamaterials.
- Refractive acoustic devices based on sonic crystals mimic optical system behavior.
- Potential for advanced acoustic manipulation and device development.
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