Fig. 2.

The phase and amplitude of the far-field scattered pressure by a silica [(a) and (c)] and polystyrene [(b) and (d)] sphere, respectively, are shown as a function of ka_s for scattering angles θ of 0–180°. Pressure amplitude values are shown as decibel-scaled values relative to the maximum calculated pressure. The frequency-dependent wave measured across the surface of a PCD with f-number N_PCD corresponds to scattering angles centered at $\theta ={90}^{°}$, the location of hydrophone measurements, and varying between $\hspace{0.17em}{\text{cos}}^{-1}(\pm 1/(2N_{\text{PCD}}))$.