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Tuesday, 11 October 2022

Scientists from the University of Tokyo have created an “invisibility cap” against echolocation

Scientists from the University of Tokyo have created an “ invisibility cap ” against echolocation 

Japanese masterminds have constructed a “ cap ” that allows you to virtually remove the echolocation response of an object. An composition about this was published in Scientific Reports. 

For a long time, the invisibility of physical objects was the subject of puck tales and myth, but in recent times, scientists have been laboriously trying to produce effective cloaking bias. In a broad sense, invisibility means covert not only in the optic, but also in other ranges. For illustration, American aircraft F- 22, F- 35 and a number of others, created in Europe and Asia, have an abnormally low radar response in short swells for their size and material due to their special shape. 


Takayuki Yamada of the University of Tokyo and his associates were suitable to make an “ invisibility cap ” against echolocation. To design aural disguise, they answered a two- dimensional problem of hiding a rigid spherical object of a certain compass located in the air. To make it “ inaudible ”, physicists proposed to compass it with four layers of two- element rods of 14, 20, 28 and 34 pieces, independently( 96 rods in total). The rods were supereminent beaches faced with silicone rubber. The positions of their centers were fixed, and the diameters of the cores and shells for each of the defensive layers( eight parameters in total) were optimized to minimize the scattering cross section of monochromic sound. 

As a result, they managed to reduce sound scattering by 13 times from all directions. Hypothetically, such a “ chapeau ” would help the creatures that batons prey on, but in this work, scientists were working a abecedarian exploration problem. 

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