Achieving Selective Damage Interrogation and Sub-Wavelength Resolution in Thin Plates with Embedded Metamaterial Acoustic Lenses

Abstract

In this study, we present an approach to ultrasonic beamforming and high resolution identification of acoustic sources having critical implications for structural health monitoring technology. The proposed concept is based on the design of dynamically tailored structural elements via embedded acoustic metamaterial lenses. This approach provides a completely new alternative to conventional phased-array technology enabling the formation of steerable and collimated (or focused) ultrasonic beams by exploiting a single transducer. The ultrasonic beams can be steered by simply tuning the frequency of the excitation. Also, the embedded lens can be designed to achieve sub-wavelength resolution to incipient clustered damage.

References in corpus (1)

• Optical Hyperlens: Far-field imaging beyond the diffraction limit

Cited by in corpus (6)

• Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
• Phononic Thin Plates with Embedded Acoustic Black Holes
• Two-Dimensional Structure-Embedded Acoustic Lenses based on Periodic Acoustic Black Holes
• Experimental evidence of robust acoustic valley Hall edge states in a non-resonant topological elastic waveguide
• Double-zero-index structural waveguides
• A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation