Fig. 4.

Effect of aperture and pitch on corrected reconstruction accuracy for a source at $(x,z)=(0\text{mm},40\text{mm})$. (a) Reconstruction at a native resolution of the experimental array (13 elements, $\Delta x=1.8\text{mm}$). (b) Reconstruction with data recorded at native resolution of the array (13 elements, $\Delta x=1.8\text{mm}$), but interpolated 4×. (c) Reconstruction with a smaller pitch of $\Delta x=0.5\text{mm}$, but with same aperture length (21.6 mm) as the experimental array. (d) Reconstruction with $\Delta x=0.5\text{mm}$, and 64 total elements. (d) Reconstruction with smaller pitch of $\Delta x=0.5\text{mm}$, but with the same aperture length (21.6 mm) as the experimental array. (d) Reconstruction with experimental pitch $\Delta x=1.8\text{mm}$, but twice as many elements (26 in total). (f) Schematic of custom 2D array used in the experiments. Scale bar in (a) is applicable to subplots (a)–(e).