Click on the image to go to some videos of the same technology.
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These numerical simulations are based on the paper
Acoustic cloaking theory
by Andrew Norris. They demonstrate
the raypaths in a non-radially symmetric cloak. The egg-shaped region in the center is acoustically invisible.
This shows the sequence of wavefronts as a plane wave transmits through a non-radially symmetric acoustic cloak. Note the rays outside the cloak are straight, while those inside go around the cloak.
At about 9 seconds the wavefront is split or torn apart on the incident side of the inner surface of the cloak, and it reattaches on the opposite soon at about 11 seconds.
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The cloak is transparent no matter what the direction of incidence.
This video shows the ray paths for plane waves from all directions. Instead of rotating the plane wave I have rotated the cloak, keeping the wave incident from the left. |
All of this cloaking is completely different from the virtual reality 'invisibility coat' that uses a camera behind the person and a projector in front. Although you have to admit it is pretty cool.
Click on the image to go to some videos of the same technology.
Support from the National Scince Foundation is gratefully acknowledged