Real-time acoustic holography with arbitrary scattering surfaces. (A) Schematic concept of our acoustic holographic technique that can create multiple levitation traps in the presence of sound-scattering physical objects. Pmax represents the maximum amplitude of the pressure in the sound field. (B) Experimental example of our technique that can levitate four particles with a projection screen (i.e. a piece of light tissue), demonstrating an MRI screen that creates digital content in the presence of a 3D printed physical object . The high calculation rates of our approach allow digital content to be interactive with user input (i.e., the levitated screen moves according to the keyboard input). Credit: Advances in Science (2022). DOI: 10.1126 / sciadv.abn7614
A team of researchers at University College London has developed a way to keep objects levitated by sound waves in the air when other objects interfere with the path of levitation. In his article published in the journal Advances in Sciencethe group describes its self-correcting levitation system.
Previous research has shown that it is possible to levitate objects by firing sound waves. Because sound waves are nothing more than air particles that move together in a certain way, the object that is levitating will fall if an object interferes with the sound waves. In this new effort, researchers developed new functions to address this problem.
Credit: Advances in Science (2022). DOI: 10.1126 / sciadv.abn7614
To protect sound waves from interference, researchers increased the number of speakers used; in their work, they used 256. They also added software to control each of the speakers. The speakers were arranged in a grid and the objects were levitated by sound waves specifically. By programming the speakers in specific ways, the computer was able to get the system to work together to keep an object above the network in the air despite interruptions. If some of the sound waves were blocked, other sound waves were redirected to take their place.
The researchers showed that their system was viable by testing it with a 3D-printed white rabbit as an object of interference. The objects levitated around the rabbit regardless of its location. In one experiment, researchers levitated beads around the rabbit that formed into a flying butterfly. They also levitated a piece of transparent cloth that they used as a screen for the projection of the rabbit they had printed. And they levitated a single drop of water on a glass of water, proving that their system would work even when the interfering object was a glass of liquid that was shaking.
This video shows the creation of a butterfly fluttering around a 3D-printed bunny, which can be controlled with hand gestures. Credit: Advances in Science (2022). DOI: 10.1126 / sciadv.abn7614
Researchers suggest that your system could be used for demonstration purposes, such as museums or advertisements. They then plan to expand their system to allow you to handle multiple interfering objects at once.
Use of sound waves to model the rotation dynamics of inertial agglomeration objects of many particles More information: Ryuji Hirayama et al, High-speed acoustic holography with objects of arbitrary scattering, Advances in Science (2022). DOI: 10.1126 / sciadv.abn7614
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Citation: A way to prevent objects levitated by sound from falling due to interference (2022, June 20) retrieved on June 20, 2022
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