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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2018 Jun 27;65(9):1618–1630. doi: 10.1109/TUFFC.2018.2851188

Fig. 10.

Fig. 10.

Phase distribution of vortex beams (radians). Left to right) imposed phase distribution on the array’s discrete elements, measured phase distribution at the focal plane before and after applying phase corrections, and simulation for (top to bottom) M = 0, 1, and 4. Before applying phase corrections, there are slight variations in the phase distribution along the radial direction. The smooth phase transition indicates that the array behaves as a continuous acoustic source.