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Posts Tagged ‘Stealth’

MIT Develops Camera Fabric

Saturday, July 18th, 2009

Thanks to PhysicsWorld.com we know that MIT has developed a new fiber that would allow a soldier to detect threats by seeing in all directions at once or to collect information to feed a stealth suit that projects an image of the surrounding environment.

New Fibers
SEM micrographs of the resulting fiber cross-section, illustrating the uniform conservation of the cross-section structure from the macroscopic preform to the microscopic fiber.
CREDIT: Courtesy of the Fink Lab/MIT

“The individual fibers created by the MIT team consist of two separate sheets of semiconducting glasses — just 100nm thick — folded up like a Swiss roll. Electrodes are worked into the fibers and the resulting cylinder, which is 35cm long, is covered in an insulating cladding. The fibers can detect light because photons interacting with a semiconductor material can ionize the component atoms, thus triggering a current in the presence of a potential difference.”

Another Stab at Stealth

Monday, June 1st, 2009

It seems like once a week we receive a report of a new stealth technology. This time, we are dealing with sound instead of light. According to the MIT Technology Review scientists has used the first acoustic metamaterial ever produced to focus ultrasound waves. Metamaterials are used to bend light in ways that appear to violate the laws of physics, creating so-called superlenses, for ultra-high-resolution optical imaging, as well as invisibility cloaks. They have a negative index of refraction allowing them to bend light backward. now it seems they can do the same thing with sound waves. Going beyond theory, Nicholas fang, an assistant professor of mechanical science and engineering at the University of Illinois at Urbana-Champaign, has demonstrated significant refraction of light. While his team still hasn’t exceeded the diffraction limit, their device, an aluminum array of narrow-necked cavities whose dimensions are tuned to interact with ultrasound waves, when filled with water, resonates the sound waves hitting it.

Acoustic Super Lens\
When filled with water, the holes in this aluminum plate act as resonant cavities that can focus ultrasound waves.

Photo: Nicholas Fang