Release date: 2016-09-23
An engineering paper published by the British magazine Nature on the 21st reported a new method for manufacturing a 3D composite sound field, an acoustic hologram, which uses a 3D printer to make a plastic film. The sound field can be produced in a non-contact manner. Manipulating liquids and objects in the air is more than 100 times more precise than the sound field made using existing technology, and it is faster and less expensive. This result will help improve medical imaging and drive new applications of ultrasound.
In theory, sound, especially ultrasound, can be used as a non-contact method to manipulate objects in liquids and air. However, current methods generally require a transducer array similar to a speaker device that is responsible for converting electrical signals into sound. Care must be taken when connecting them together to create the desired 3D sound field, and the size and complexity of the resulting sound field are limited.
This time, Pierre Fisher, a researcher at the Max Planck Institute for Intelligent Systems in Germany, and his colleagues simply generated acoustic holograms. They used 3D printers to make plastic negatives before they were placed in a single transducer. Change the sound waves to create the desired sound field. In the experiment, the researchers used the acoustic hologram system to force the particles suspended in the water to converge to form an image resembling a flying dove.
Researchers say the system can be used to move objects in a liquid along a specific path, or to suspend droplets in the air. The authors suggest that their acoustic holograms make it possible to quickly create a composite sound field, and the resulting sound field is suitable for super-resolution imaging, localized heating, and individualized medication.
In the news and opinion articles accompanying the paper, Adrian Nielde of Monash University in Australia said that the researchers created a very complex and detailed acoustic hologram through a simple experimental device, which can be used not only Manipulating microscale objects will also have great potential in the medical field.
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Holographic technology reveals the connection, change and causal relationship between things in three dimensions, and restores the image and other information of objects in the "mirage" generated by light waves or sound waves. The traditional technology of generating composite sound field is complicated, the operation is cumbersome, and the sound field is limited in scale. The new technology of this paper not only greatly shortens the previous operation time, but also improves the control precision by hundreds of times, and almost directly upgrades the laboratory level to the industrial level.
Source: Technology Daily
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