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Sound wave 3Dvolution: Japanese scientists move objects using acoustic levitation

Published time: January 03, 2014 00:34
Edited time: January 03, 2014 19:02
Image from 96ochiai.ws/3DOFacoustic

Image from 96ochiai.ws/3DOFacoustic

Japanese scientists have been successful in moving an object in a three-dimensional space through a complex system of acoustic levitation, surpassing previous research endeavors that lifted the objects in two dimensions.

In order to move expanded polystyrene particles of 0.6 mm and 2 mm in diameter, the Japanese scientists at the University of Tokyo and the Nagoya Institute of Technology had to place the objects inside a complex set-up of four arrays of speakers.

Image from 96ochiai.ws/3DOFacoustic

Using a refinement of the existing technology of sound wave management, bubbles, a screw and a tiny piece of wood were airlifted and moved around in all direction within the experiment’s confines.

“We considered extended acoustic manipulation whereby millimeter-sized particles were levitated and moved three-dimensionally by localized ultrasonic standing waves, which were generated by ultrasonic phased arrays,” the study stated.

The experiment machine is comprised of audio speakers capable generating inaudible high frequencies sound waves that intersect inside a restrained space. The waves then generate a “moveable ultrasonic focal point,” frequency noise greater than 20kHz, where crossover creates standing waves. Some waves are kept in constant position, serving as a suspending force, while other waves are used to support a floating object jammed in the standing waves.

“Our manipulation system has two original features. One is the direction of the ultrasound beam, which is arbitrary because the force acting toward its center is also utilized. The other is the manipulation principle by which a localized standing wave is generated at an arbitrary position and moved three-dimensionally by opposed and ultrasonic phased arrays,” the study said.

The practice of moving tiny objects acoustically along the fixed axes is not new, but it was previously applied to 2D, starting from 1975.

“The essence of levitation technology is the countervailing of gravity. It is known that an ultrasound standing wave is capable of suspending small particles at its sound pressure nodes,” Yoichi Ochiai from University of Tokyo said.

Currently, acoustic levitators are used mostly in industry and for researchers of anti-gravity effects such as at NASA.

Potential energy distribution of ultrasonic standing wave (Image from arxiv.org)

Comments (22)

 

Diliup Gabadamudalige 14.01.2014 17:40

people don't get carried away when someone describes the top of the iceberg. There are a lot of things science cannot and never will explain.

 

Markham Breitbach 06.01.2014 22:30

Hey @Tim_Bravo, The difference here is that someone has has actually documented the method of achieving this phenomenon in a rational and reproducible fashion.

So me pretty quick math also rules out any claims of a few monks using this technique to lift a giant rock with their voices, the energy required would be astronomical.

Of source, stories like that are a fantastic way to sell books to the weak-minded.

 

Peter 04.01.2014 01:55

Peter 03.01.2014 10:08

Mozart used this technique to lift the gigantic petticoats of the girls listening to his music...

  

That's why he became so famous...

View all comments (22)
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