Figure 5: Received beamforming measured by microphone located at off-axis and displaced from focal-line.
From: Directional Reflective Surface Formed via Gradient-Impeding Acoustic Meta-Surfaces
(a) Schematic of experimental setup used to measure sound pressure level (SPL) gain for 30° obliquely incident sound wave at 1490 Hz. (b) SPL gain contour for 30° obliquely incident sound wave. Measured polar SPL gain for setup shown in (a) at (c) (−60, 30) and (d) (−90, 30). Calculated polar SPL gain for setup shown in (a) at positions (e) (−60, 30) and (f) (−90, 30). (All positions are in millimetres).
