Fig. 4: Experimental demonstration of isotropic edge enhancement.
From: Compact meta-differentiator for achieving isotropically high-contrast ultrasonic imaging
a Schematic illustration of the experimental setup for underwater acoustic field measurements. b Amplitude object fabricated from a steel plate with a circular hole. c Simulated and (d) measured acoustic intensity and phase distributions at the output plane under the illumination of a point source from the input side. e Simulated (line) and measured (circle) intensity profiles along the vertical direction of the output images in (c) and (d). f–i Same as (b–e), but for the amplitude object made of a steel plate with a hollow pattern in the shape of the numeral 2 at the center.
