Figure 3
Simulation results for acoustic lenses with different structures: (a,b) Wave intensity field distributions under parallel incident waves, where the total calculated length in the x-direction in the simulation is 1000 mm. (c) Intensity distribution along the x-axis at the center of each lens. The origin of the coordinate system is selected to be the position before the two focal points, and the two structures share the same origin and terminal positions. To describe the subsequent trends of the wave intensity distribution along the x-direction, black and red dashed lines are plotted to represent the additional simulation data. (d,e) Partial magnified views of the differently structured lenses in (a,b), as indicated by the dotted red rectangles, and the sound field for each unit cell.
