Abstract
Time reversal acoustics (TRA) has gained widespread applications for communication and measurements. In general, a scattering medium in combination with multiple transducers is needed to achieve a sufficiently large acoustical aperture. In this paper, we report an implementation for a cost-effective and compact time reversal emitter-receiver driven by a single piezoelectric element. It is based on a leaky cavity with random 3-dimensional printed surfaces. The random surfaces greatly increase the spatio-temporal focusing quality as compared to flat surfaces and allow the focus of an acoustic beam to be steered over an angle of 41°. We also demonstrate its potential use as a scanner by embedding a receiver to detect an object from its backscatter without moving the TRA emitter.
Highlights
Time reversal acoustics (TRA) is a self-adaptive technique which is capable of focusing an acoustic wave effectively through a lossless heterogeneous medium[1,2,3]
Arnal et al.[18] demonstrated a compact version (14 cm × 14 cm × 25 cm) of a scattering medium for lithotripsy applications, which is based on the idea of a leaky liquid filled cavity but containing multiple scattering rods embedded
At last we report on the scanning properties of the transmitter/receiver design to detect small reflectors
Summary
Time reversal acoustics (TRA) is a self-adaptive technique which is capable of focusing an acoustic wave effectively through a lossless heterogeneous medium[1,2,3]. During propagation through the medium, this initial acoustic pulse is refracted, reverberated and scattered, and is recorded at a point of interest by a receiver converting the acoustic signal into an electrical signal This electrical signal is stored, time reversed and fed to the emitting transducer. Arnal et al.[18] demonstrated a compact version (14 cm × 14 cm × 25 cm) of a scattering medium for lithotripsy applications, which is based on the idea of a leaky liquid filled cavity but containing multiple scattering rods embedded They obtained the high pressures needed by exciting the cavity with an array of 128 individually controlled piezoelectric elements. Its shape resembles that of acoustic diffusers used in room acoustics, this design operates partly in transmission www.nature.com/scientificreports/
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