Figure 5
From: Sound Pressure Level Gain in an Acoustic Metamaterial Cavity
Sound amplification in an underwater environment:
(a) schematic and (b) photograph of experimental apparatus constructed to measure SPL in an underwater environment; (c) SPL gain for metamaterial sound amplification cavity (Sample 1) enhanced by quarter-wave resonator; (d) calculated SPLs for metamaterial sound amplification cavity enhanced by quarter-wave resonator; COMSOL finite element software was used to simulate SPL using water (ρ = 1000 kg/m3, c = 1480 m/s) as the working fluid.
