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(a) Plan schematic of the gradient index lens. (b) Cylinder radius plotted vs position along the -axis. (c) Digital photograph of the GIL in the isolation tank.
(a) Normalized pressure amplitude plotted vs and , measured 2.144 ms after the initial pulse leaves the source. (b) Measured, normalized pressure intensity plotted vs and after averaging over a 10-cycle pulse. (c) Normalized pressure intensity calculated using MST. The focusing peak maximum is marked by a .
(a) Measured, normalized pressure intensity vs for source positions , 185.8, 175.7, 165.5, 155.4, 145.2, 135, 124.9, and 114.7 cm. (b) Normalized pressure intensity calculated using MST for source positions , , , , , , and . Inset: expanded region of the vertical axis showing the focusing peak positions. (c) Two focusing peaks from panel (a) are replotted as circles (upper region offset for clarity). Black lines indicate a double-Gaussian fit, with blue (peak 1) and red (peak 2) lines showing the component Gaussians individually. (d) Inverse peak positions plotted vs inverse source positions . Blue and red lines are fits to the trends of peaks 1 and 2, respectively. The dashed line plots the peak positions of the simulated data in panel (b).
(a) Measured, normalized pressure intensity plotted vs and with the source at a 14.7° angle with respect to the -axis. (b) Normalized pressure intensity calculated using MST with the source at a 15° angle. White lines indicate the off-axis angle; positions of the expected focusing peaks are marked with a .
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