A compact time reversal emitter-receiver based on a leaky random cavity.

Area of Science:

• Acoustics
• Wave physics
• Materials science

Background:

• Time reversal acoustics (TRA) is crucial for communication and measurements.
• Conventional TRA requires multiple transducers and scattering media for a large aperture.

Purpose of the Study:

• To develop a cost-effective and compact TRA emitter-receiver system.
• To enhance spatio-temporal focusing quality and beam steering capabilities.

Main Methods:

• Implementation of a TRA system using a single piezoelectric element and a leaky cavity.
• Utilizing 3D-printed random surfaces within the cavity to improve focusing.
• Demonstrating beam steering over a 41° angle.

Main Results:

• Achieved enhanced spatio-temporal focusing quality compared to flat surfaces.
• Successfully steered an acoustic beam over a 41° angular range.
• Demonstrated object detection via backscatter using the TRA system as a scanner.

Conclusions:

• The developed TRA system offers a compact and cost-effective solution.
• Random surfaces significantly improve acoustic focusing and beam steering.
• The system shows potential for scanning applications without mechanical movement.