This discovery could lead to technology capable of&nbsp;manoeuvring&nbsp;drug capsules around the body, container-less transportation systems, and even the levitation of humans for medical or other purposes, the engineers say. Researchers previously thought that acoustic tractor beams were limited to levitating small objects. This is because previous attempts to trap particles larger than the wavelength of the sound being used were unstable, with levitated objects spinning out of control.The team found a workaround for this problem by using rapidly fluctuating tornadoes of sound &ndash; essentially a twister-like structure made up of a loud sound surrounding a silent core. They were then able to increase the size of the silent core, allowing it to hold larger objects.Using ultrasonic waves at a pitch of&nbsp;40kHz, a frequency above human hearing but detectable by dogs, the researchers held a&nbsp;two-centimetre&nbsp;polystyrene sphere stationary in the tractor beam. The sphere was more than two acoustic wavelengths in size, making it the largest object to be trapped in a tractor beam.The finding gives hope that larger objects, such as humans, could be levitated using the same technique, the researchers say.&ldquo;Acoustic tractor beams have huge potential in many applications,&rdquo; said Prof Bruce Drinkwater, who supervised the research. &ldquo;I&rsquo;m particularly excited by the idea of&nbsp;contactless&nbsp;production lines where delicate objects are assembled without touching them.&rdquo;

Acoustic Tractor Beam Breakthrough Could Lead To Levitating Humans

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