According to foreign media reports, the unidirectional acoustic traction beam is a device that uses unidirectional sound waves to capture and draw objects. Dr Asier Marzo (Dr Asier Marzo) was involved in the research and development of the device when he was studying for a doctorate at Navarra Public University in Spain. Now, as an assistant researcher at the University of Bristol, Dr. Ma Zuo adjusted the technology so that anyone can make this device through 3D printing, and explained in a video.
"It can also suspend small objects such as flies in the air. It is very convenient to use." The research team leader Dr. Ma Zuo pointed out.
This technology gives people a glimmer of hope: in the future we may be able to use similar technologies to move larger objects.
The research will be published in this week's Journal of Applied Physics Communications. It explains the manufacturing process of the acoustic beam.
Although the use of sound waves to suspend and move objects is not a new concept, the difference of this new technology is that it can not only use sound waves to push objects, but also pull animal bodies, including small beads and insects.
Dr. Ma Zuo said: "The key is that it can pull objects towards the sound source. It is easy to push objects away from the sound source, but it is very difficult to pull them towards the sound source. When you move the traction beam , The object will also move with it, otherwise it will be trapped by the tow beam and stay motionless. It can also suspend small objects like flies in the air. It is very convenient to use. We will give a set of instructions for use and introduce the need There will be a step-by-step video explaining which parts are used. The components used are very simple and can be purchased on Amazon for less than 50 pounds (about 420 yuan). "
The homemade sonic traction beam has a very wide range of uses, and can even be used to study the effects of low-gravity environments on organisms.
"Several recent papers have raised the question: If we suspend the embryo in the air, how will it grow? If we suspend the bacteria in the air, what will happen?" Dr. Ma Zuo pointed out, for example, the researchers found The toxicity of Salmonella intestinal when suspended in the air will be tripled. Some microbes will produce different reactions under microgravity. "
The device uses three different designs, each with a different wavelength, and can be used to pull different objects.
However, it is still difficult for the device to pull objects with a diameter greater than half the wavelength of the sound wave. This results in objects that can be pulled only a few millimeters in diameter.
The working principle of the device is as follows: the traction beam generates sound waves at a single sound source. The metamaterial used in the device contains a large number of tubular structures with different lengths. When sound waves pass through these tubular structures, they form a traction beam.
Dr. Ma Zuo pointed out: "We have previously developed a traction beam, but its structure is complex and costly because it requires a phased array, which is a complex electronic component system. A simple, static traction beam was developed, requiring only a static piece of material. "
One of the main problems researchers need to solve is to keep the device free from the limitations of low-end 3D printers. After this problem is resolved, the research team will begin to develop the rest of the traction beam and use components that are easy to purchase and provided by open source electronic equipment suppliers. 
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