Making opaque materials totally transparent

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Most naturally occurring materials have a disordered atomic structure that interferes with the propagation of both sound and electromagnetic waves. When the waves come into contact with these materials, they bounce around and disperse – and their energy dissipates according to a highly complex interference pattern, diminishing in intensity. That means it’s virtually impossible to transmit data or energy intact across wave-scattering media and fully leverage the potential of wave technology.

For an example, you need look no further than your smartphone – the geolocation function works less well inside buildings where radiofrequency waves scatter in all directions. Other potential applications include biomedical imaging and geological surveying, where it’s important to be able to send waves across highly disordered media.

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3D acoustic cloak makes objects undetectable with sound

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The geometry of the plastic sheets and placement of the holes interact with sound waves to make it (and objects beneath it) appear as if they are not there.

Duke University engineers have demonstrated the world’s first three-dimensional acoustic cloak using a few perforated sheets of plastic and extensive computation. The new device reroutes sound waves to create the impression that both the cloak and anything beneath it are not there. (Video)

 

 

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Sound Waves are the Latest Weapon in the Fight Against Dentist Phobias

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Sound waves are used to calm dental patients

New technology that experts claim can calm the brain is being used by British dentists to relax nervous patients.  Developed by American neuroscientists, the equipment, called NuCalm, induces a state of deep relaxation even in highly anxious patients.

 

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Baby Monitors of the Future Could Translate Infant Cries

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Technology could soon identify why baby is crying.

Babies change their cry to signify if they are hungry, sad or even in pain, and technology could soon identify which, scientists believe.  Identifying the changes could lead to the development of baby monitors capable of diagnosing an infant’s complaint, they claim.

 

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Scientist Close To Invisibility Cloak

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Invisibility is on the horizon

While some work toward an invisibility cloak, University of Illinois professor Nicholas Fang is taking steps to create a similar material, only for sound, that could, for example, make ships invisible to SONAR. To successfully do this, of course, requires we break the laws of physics. But, you know, whatever. Continue reading… “Scientist Close To Invisibility Cloak”

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Acoustic Cloak Material Designed

Acoustic Cloak Material Designed 

 

 Sound waves moving from left to right flow past the object and reform on the other side with no distortion.

City dwellers, rest easy. Engineers have designed a material that redirects sounds and could be used in buildings to shield them from noises. The sound-shielding material, which, if actually made, would be the first acoustic cloaking device, could also be useful in hiding military ships and other vessels from sonar.

 

 

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