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Researchers at the University of Sussex are the first in the world to develop a technology capable of bending sound waves around an obstacle and levitating an object above it.
SoundBender, developed by professors Sriram Subramanian, Gianluca Memoli and Diego Martinez Plasencia of the University of Sussex, is an interface capable of producing dynamic folding beams that allow both levitation of small objects and tactile feedback. around an obstacle.
The technology, which will be presented this Monday at the 31st symposium on software and technologies of the ACM user interface in Berlin [October 15], overcomes two major limitations of previous ultrasonic levitation installations, which were unable to create sound fields of similar complexity and could not bypass the obstacles located between the transducers and the object in levitation.
Dr. Memoli, Lecturer on New Interfaces and Interactions at the University of Sussex, said: "This is an important step forward for the levitation of ultrasound and overcomes a significant disadvantage that hinders development in this area. We've achieved incredibly dynamic and responsive control, so real-time adjustments are two steps away. "
Researchers at the University of Sussex have taken up these challenges by developing a hybrid system that combines the versatility of Phase Transducer Networks (PAT) with the accuracy of acoustic metamaterials, while helping to eliminate the restrictions on acoustic metamaterials. sound field resolution and variability applied to each of the previous approaches applied.
The technology allows users to experience a haptic feedback beyond an obstacle. levitate around an obstacle and handle non-solid objects, such as changing the orientation of the flame of a candle.
With SoundBender, the metamaterial provides a low modulation pitch to help create sound fields with high spatial resolution, while the PAT adds dynamic control of the amplitude and phase of the field.
Dr. Martinez-Plasencia, Lecturer in Interactive Graphics at the University of Sussex, said: "We were attracted to this project because of its similarities between optical holography and acoustics.
However, the project was a great journey of discovery, helping us understand how crucial it is to have high spatial resolution (ie metamaterial), or the techniques needed to combine PAT and metamaterials. I am really happy that we can now share all this information with the rest of the community. "
The development opens up a new potential in the ultrasonic levitation, which has a distinct advantage over other levitation techniques because it does not require any specific physical property, such as magnetic or electrical, in the object to levitate and can so be applied to a much wider range of properties. materials, including liquids and foods.
The concept of self-bending beams was originally used in engineering applications to mask buildings from noise or protect areas from earthquakes, but it's the first time that it's adopted for use in acoustic levitation.
The hybrid system allows for many fun applications, including new educational experiences with museum exhibits, enhanced board games with new levels of interactivity, the ability to direct a diffuser's desired smells to where they want to be. are necessary, the possibility of controlling the movement in a non-interactive way. solid objects (such as dry ice or fire) and the ability to synchronize these movements with music.
Teacher. Sriram Subramanian, professor of computer science at the University of Sussex and RAAng Emerging Technologies Chair (RAAng), specializing in the development of innovative acoustic interfaces, said: "Following our breakthrough, we now have the potential of a device capable of bending around big, potentially even if the obstacle is moving.
"We are also looking to make the device broadband so that it works for all sound frequencies.This would allow, for example, to send music from a radio behind a corner or to create music. areas of silence in the middle of a dance floor. "
Research Document
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University of Sussex
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