Design of an Underwater 3D Positioning System for Verifying Focusing Performance of Underwater Acoustic Metamaterial in a Water Tank

A test of underwater acoustic measurement in a water tank is required for the performance verification of metamaterials for underwater sound. An underwater 3D positioning system was developed for the performance test and a simple tank experiment has been done for checking its testability. We found that clear tone signal is observed by removing reflected waves. An underwater acoustic metamaterial was fabricated and the focusing performance was measured with the developed underwater 3D positioning system.