Figure 4
From: Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation
(a–c) Pressure field distributions of different regular polygons. (a) Square concentrator; (b) pentagonal concentrator; (c) octagonal concentrator; (d) normalized intensity magnitude in central area of (a). The values are taken from the straight line segments of \({\text{y}} = 0\;{\text{m}}\) and \({\text{x}} = - 0.2\sim 0.2\;{\text{m}}\). The line is located in the central area, as shown by the white line segment in (a). The Ref line is reference line in the same position, but without the device. Curves in different colors represent the pressure fields of different layers.
