Figure 5
Frequency dependence of the averaged visibility (γ) associated to sound waves propagating in free space (black dots) and the waves interacting with a rigid circular obstacle placed at the center of the waveguide (square symbols). The diamond symbols (hollow triangles) represent the data measured when the obstacle is surrounded by the cloak made of 20 Bézier scatterers (120 circular cylinders). The acoustic cancellation occurs at 5.94 kHz and 6.08 kHz for the case of the Bézier cloak and cylinder cloak, respectively.
