Explanation graphic (IMAGE)

University of Bristol

Explanation graphic

Caption

(a) An ultrasonic phased array emits a zero-order Bessel beam that traps a particle in its high-pressure core. (b) The beam's pressure field extends vertically along the axis. (c) Its working range (141–397 mm) far exceeds a conventional single-sided method (up to 66.7 mm).

Credit

Koroyasu et al., University of Tsukuba

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