Researchers have found a way to make materials that are normally opaque to sound waves completely transparent. Their system involves placing acoustic relays at strategic locations so that sound waves can propagate at a constant amplitude – regardless of what may lie in their path. This method could eventually be used to make it possible to hide objects like submarines.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/07/180702111114.htm
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