Research into the use of ultrasound to lift and hold objects in the air will enable scientists to study objects with extreme conditions, such as molten metal or superconducting materials. . However, if developed at a higher level and widely applied, we would have known that there would be dangling decorations in the air or even remote-picking devices like Stars War.
Actually, scientists have always dreamed of a device that uses sound to lift objects in mid-air. The biggest difficulty, however, is that you can not lift an object larger than the wavelength of sound. Researcher Marco Andrade explains that the maximum size of an object raised by ultrasound can only be one quarter of the wavelength, in other words, if an ultrasound sound source is used at an approximate frequency 20 kHz can only lift a particle of maximum size about 4mm.
The team created standing waves in the space between the ultrasonic source and the object.
To overcome this limitation, the team created a standing wave in the space between the ultrasonic source and the object, instead of the anchor at the radio node between the source and the reflector. On the other hand, researchers can change the angle and number of sources without affecting the effect. And more importantly, they can also create horizontal and vertical lifting forces, without the need for other physical measures to prevent the subject from drifting.
In a demonstration experiment they used the medium developed to lift a 1.46 gram PS ball suspended in the air with a size 3.6 times larger than the ultrasonic wavelength used for lifting. Although the technology is currently available only for stationary objects, in the future, the team said it would add other capabilities. Because it can be lifted regardless of its shape or size, this promises to have a lot of applications in different areas in the future.