Metamaterial based acoustic lenses for structural health monitoring
AssigneeUniversity of Notre Dame du Lac
InventorsFabio Semperlotti, Hongfei Zhu
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Abstract
An embedded acoustic metamaterial lenses allows for ultrasonic beam-forming and high resolution identification of acoustic sources for structural health monitoring. The lenses design provides an alternative to conventional phased-array technology enabling the formation of steerable and collimated (or focused) ultrasonic beams by exploiting a single transducer. The ultrasonic beam can be steered by simply tuning the frequency of the excitation. Also, the embedded lens can be designed to achieve sub-wavelength resolution to clustered acoustic sources which is a typical scenario encountered in incipient structural damage.
Claims4
A metamaterial based acoustic lens for structural health monitoring comprising:
- a transducer;
- a thin plate;
- and
- a metamaterial lens embedded within the thin plate, wherein the plate is positionable such that the metamaterial lens at least partially overlays the transducer;
- wherein selected sectors of the metamaterial lens at prescribed azimuthal location include line defects to create localized modes at selected frequencies inside the bandgap.
Dependencies are inferred from the claim text.