3D rabbit hologram created by levitating objects with sound

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Sound waves can be utilized to maintain an object hovering within the air, and a brand new approach works even in crowded areas



Physics



17 June 2022

A rabbit hologram levitated above a 3D-printed rabbit

Ryuji Hirayama, College School London

Ultrasonic sound waves have been used to levitate objects in crowded rooms to make hologram-like displays. Such acoustic levitation was beforehand solely sensible in empty areas, however a brand new algorithm can shortly readjust the sound waves once they encounter an impediment to maintain the item within the air.

Sound waves are comprised of air particles shifting collectively. If manipulated in the precise manner, they will decide up and transfer objects. Nevertheless, if the sound waves run into another object that displays or scatters them, the levitating object can come tumbling down.

Ryuji Hirayama at College School London and his colleagues beforehand used sound to levitate glowing beads to create floating 3D shapes. Now, they’ve developed a computational approach that permits them to levitate and manipulate objects above bumpy surfaces and close to objects.

Hirayama and his colleagues used 256 small loudspeakers organized in a grid to levitate objects with exactly formed ultrasound waves. When these sound waves encountered objects that may normally scatter them, like a wall or a houseplant, a pc algorithm shortly adjusted their form to take care of levitation.


The researchers demonstrated their approach by 3D printing a small plastic rabbit, then levitating objects close to it. In a single experiment, they made illuminated beads fly across the rabbit within the form of a butterfly whose “wings” may very well be managed by the movement of a researcher’s fingers.

In one other, they levitated a chunk of almost clear material above the rabbit and made it spin whereas a projector forged photos of the rabbit onto it. The consequence was a seemingly 3D rabbit hologram hovering above its plastic counterpart.

Additionally they levitated a drop of paint over a glass of water. This confirmed that their algorithm works even when suspending objects that may change form above a floor that may wiggle because it displays sound.

Bruce Drinkwater on the College of Bristol within the UK says that the brand new approach may very well be used to undertaking info with plenty of “wow issue” in museum shows or promoting. It is also employed in chemical engineering, utilizing sound waves to combine supplies with out anybody having to the touch them. The brand new methodology appears extra strong than earlier ones, so it may make acoustic levitation sensible extra broadly, he says.

Hirayama says that, to this point, he and his colleagues have solely thought of acoustic levitation in areas stuffed with sound-scattering objects that don’t transfer in any respect or transfer solely in a couple of predictable methods, corresponding to a hand attempting to the touch a levitating hologram. Their subsequent objective is to excellent their mid-air object manipulation utilizing sound when every little thing within the room is shifting in surprising and unanticipated methods.

“We wish to make this know-how sensible and have it react to things in actual time,” he says.

Journal reference: Science Advances, DOI: 10.1126/sciadv.abn7614

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