Experimental demonstration of three-dimensional broadband underwater acoustic carpet cloak

TL;DR

This paper demonstrates a 3D underwater acoustic carpet cloak that effectively manipulates sound waves to hide objects across a wide frequency range, verified through experimental tests in an anechoic tank.

Contribution

It introduces a novel 3D underwater acoustic cloak design using an octahedral pyramid of steel strips, with experimental validation of its broadband cloaking performance.

Findings

Effective cloaking demonstrated in all directions

Operates over a wide frequency range

Experimental results match theoretical predictions

Abstract

We present the design, architecture and detailed performance of a three-dimensional (3D) underwater acoustic carpet cloak (UACC). The proposed system of the 3D UACC is an octahedral pyramid which is composed of periodical steel strips. This underwater acoustic device, placed over the target to hide, is able to manipulate the scattered wavefront to mimic a reflecting plane. The effectiveness of the prototype is experimentally demonstrated in an anechoic tank. The measured acoustic pressure distributions show that the 3D UACC can work in all directions in a wide frequency range. This experimental verification of 3D device paves the way for guidelines on future practical applications.