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. Author manuscript; available in PMC: 2019 Dec 30.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Jun 24;66(9):1453–1464. doi: 10.1109/TUFFC.2019.2924351

Fig. 4.

Fig. 4.

Harmonic beam profile plots at three different zoom levels for nonlinear pressure waves produced by the 3.91 MHz transducer. The harmonic number is denoted by n. Gaussian fits are shown in dotted lines. Error bars denote plus and minus one standard deviation, obtained from transverse scans obtained horizontally and vertically. The black vertical lines show the spatial extent of the HNA-0400 sensitive element, within which Gaussian shape is assumed by (4). The beam plots support the Gaussian model for radial profiles across the HNA-0400 sensitive element.