Figure 7
From: Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
Effect of thickness of the acoustic cloak on scattering pattern. (a) Schematics of acoustic cloaks with reduced thickness for R2 = 2, 1.6, and 1.2 m. (b) Polar plot of directivity patterns of the acoustic cloaks with reduced thickness in moving medium for M = 0.2. (c) Rectangular plot of directivity patterns of the acoustic cloaks with reduced thickness in moving medium for M = 0.2. The directivity patterns are calculated in dB scale by using equation (5) at r = 10R1. (d) Maximal errors calculated by using equation (8) at r = 10R1 for various thicknesses of acoustic cloak. As shown in (b) and (c), the thinner cloak shows less of scattering from the cloak in moving medium. In addition, as clearly shown in (d), the scattering decreases as the thickness of acoustic cloak decreases.
