backtop


Print 19 comment(s) - last by Master Kenobi.. on Oct 7 at 5:57 PM


  (Source: blogspot.com)
Carbon Nanotubes were electrically stimulated to bend light rays away from the object behind the cloaking device, leading to total invisibility

To date, researchers from all over the world have invented invisible cloaks for many purposes, such as military stealth and even soundproofing. For instance, a UK company designed a camouflage cloak for military vehicles, and University of Illinois researchers developed an underwater cloak that can hide objects from sonar.

Now, researchers from the University of Dallas have added a new invisible cloaking device to the mix. Like the work accomplished by the University of Illinois, Dallas' works best when underwater, but unlike many other cloaking tools, this new addition utilizes a mirage effect to achieve invisibility.

Dr. Ali Aliev, study leader from the University of Dallas, was able to successfully use the mirage effect to create an invisible cloaking device via carbon nanotubes. The mirage effect is a naturally occurring phenomenon that happens when a significant temperature change over a short distance bends light rays so that they're redirected from the hot ground to your eye, creating a displaced image of the sky or distant objects within view.

Aliev wanted to imitate this process with a material that could conduct heat and send it to surrounding areas quickly. The material needed ended up being carbon nanotubes, which are strong as steel and dense as air with one-molecule thick sheets of carbon shaped like a cylindrical tube.

When the carbon nanotubes were electrically stimulated, the temperature gradient led to the bending of light rays away from the object behind the cloaking device. This resulted in total invisibility.

"Using these nanotube sheets, concealment can be realized over the entire optical range and rapidly turned on and off at will, using either electrical heating or a pulse of electromagnetic radiation," said Aliev. "The research results provide useful insights into the optimization of nanotube sheets as thermoacoustic projectors for loud speaker and sonar applications, where sound is produced by heating using an alternating electrical current."

A video of the invisible cloaking device can be seen below:


This study was published in IOP Science.

Sources: IOP Science, Wired, Fox News



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

RE: Laughable...
By TheEinstein on 10/6/2011 2:52:48 AM , Rating: 2
Let me clarify. A tank, a soldier, a M1 Carbine... all are normally identifiable, though per scale at different distances (and also determined by natural background, movement, etc, but lets assume they are not moving and background is 'neutral')

Take the first Micron on an edge with visibility for approximately a 150 degree sphere around to and from (in all three frames of reference, x,y,z)

This Micron amazingly can retransmit light (assuming it is not an emission source itself) a significant distance with only itself.

Take the neighboring 99 microns as well... We now have 100 microns transmitting for miles with only a bit of entropy inside the sphere they are transmitting (a good telescope after all can see objects very far away with very little real loss)

You have to 'color scheme' not the individual micron of the 100... But the end resulting partial SPHERE they create. This is miles out, and in a full radius of the view. I do not even want to consider how many different locations need a potential different ray representing a color of an object that would have been in line of sight if the microns were not there.

This is why cloaking is truly impossible. And do not get me started on different wavelengths.

Please refrain from EVER using the word CLOAK or CLOAKING... It is Stealth, Camouflage, and/or Obfuscation.

Yes I am ANAL over this, but seriously... if you follow science, and follow math, you should refrain from hyping false terms!


RE: Laughable...
By Black1969ta on 10/6/2011 11:33:41 PM , Rating: 2
quote:
Please refrain from EVER using the word CLOAK or CLOAKING... It is Stealth, Camouflage, and/or Obfuscation. Yes I am ANAL over this, but seriously... if you follow science, and follow math, you should refrain from hyping false terms!


You Sir should refrain from speaking until you have at least used Google to back-up your mistaken ideas.
A simple Google search "Define: Cloaking," defines cloaking as, "2. Hide, cover, or disguise (something)."

Clicking on the Merriam Webster link lists, "Camouflage" as a Synonym of Cloak!

As to the rest of your Theories, Cloaking is not expected to completely obfuscate an item, at least not at first, the goal is to just disguise it long enough to provide a clear tactical advantage, much like Stealth technologies.


"I modded down, down, down, and the flames went higher." -- Sven Olsen














botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki