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Metamaterials Make Objects Invisible to Sonar

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Metamaterials redirect approaching waves around an object without scattering the wave energy, concealing the object from...
Metamaterials redirect approaching waves around an object without scattering the wave energy, concealing the object from the sound waves(Credit: Peter Kerrian)

A team of researchers at Pennsylvania State University, led by Amanda D. Hanford, has developed a “cloaking device” that works underwater. The new metamaterial shield is able to intercept and bend underwater sound waves, like sonar, around it without scattering them – making it appear as if the cloak and anything within it isn’t there at all.

Metamaterials are materials designed to exhibit properties not found in nature. They are generally constructed from composite materials, like metals, plastics, or ceramics, and engineered into repeating, microscopic structures.

In the case of the underwater acoustic cloak, the goal was to make a metamaterial that could do for submarines or undersea installations what science fiction cloaking devices do for Klingon warbirds. Acoustic cloaking has already been achieved in the lab, but only in the air. Water is much more of a challenge because it’s denser and much less compressible than air, which limits cloak engineering options.

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About the Common Constitutionalist

Brent, aka The Common Constitutionalist, is a Constitutional Conservative, and advocates for first principles, founders original intent and enemy of progressives. He is former Navy, Martial Arts expert. As well as publisher of the Common Constitutionalist blog, he also is a contributing writer for Political Outcast, Godfather Politics, Minute Men News (Liberty Alliance), Freedom Outpost, the Daily Caller, Vision To America and Free Republic. He also writes an exclusive weekly column for World Net Daily (WND).

One comment on “Metamaterials Make Objects Invisible to Sonar

  1. Pingback: Metamaterials Make Objects Invisible to Sonar – USSA News | The Tea Party's Front Page

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