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Friday, February 16, 2018

Physics for the first time forced a large object fly using ultrasound

Experts from Bristol University, was able to hold in the air a ball with a diameter of 1.6 cm with the help of a phenomenon called acoustic levitation. To make stably levitate an object that is larger than the length of the used sound waves, scientists were able for the first time.

photo: pixabay.com

In the past, professionals were able to levitate using ultrasound are very small objects and even insects, but larger objects in this situation started an uncontrolled spin and held in the air not too good. In the new experiments, the scientists solved this problem by holding the object multiple streams of ultrasound from a single source, which created a kind of vortex. On the results, the scientists said in the pages of the scientific journal Physical Review Letters and dedicated scientists prepared a video.

Let polutorametrovy ball may not seem really large object, the experts explain that he was sent flying with almost two times shorter ultrasonic waves. This means that the new technology allows to overcome an important barrier, and scientists fully admit that in the future the same principle can levitate even a person.

However, experts suggest that, first and foremost, their technology will have a more “practical” applications — for example it will be possible to transfer sterile or extremely fragile objects without touching them. In this case, the corresponding setting will not be noisy (as if instead of ultrasound used sound audible range) and will have a devastating effect (as infrasound). The main problem of ultrasonic waves — the fact that they are very short, the new technology needs to solve successfully.

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