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Published: 6 Jan 2014

Acoustic Levitation

Extra

Researchers from the University of Tokyo have demonstrated the ability to move objects in mid-air using sound waves – a technique known as “acoustic levitation”.

Research into acoustic levitation has been ongoing for several decades, using ultrasonic waves inaudible to humans. However, this is the first time scientists have been able to demonstrate movement in multiple directions rather than just up and down.

The experiment used audio speakers arranged facing inwards to create a “moveable ultrasonic focal point”, which can be shifted by adjusting the output from the speakers. The set-up is capable of manipulating polystyrene balls, screws and water droplets to form complex formations in the air.

The scientists hope to further refine the technique so it can be used as a positioning tool for delicate electrical components in hardware manufacture.

Big brands are currently exploring other commercial uses for acoustic levitation. In December 2013, UK automaker McLaren hinted at plans to replace windscreen wipers with ultrasonic force fields that can repel water from the windshield of its supercars.

For more on the potential of sonic design, see Sound & Space: Sonic Design for Complete Experiences.

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