Skip to comments.New device invisible to magnetic fields
Posted on 03/24/2012 11:19:51 PM PDT by U-238
European researchers said Thursday they have created a device invisible to a static magnetic field that could have practical military and medical applications.
Fedor Gomory and colleagues in Slovakia and Spain designed a cloak for a direct current, or dc, magnetic field that is static and produced by a permanent magnet or coil carrying a direct current.
DC magnetic fields are used in MRI imaging devices, in hospitals and in security systems, such as those in airports.
The researchers' device, described in a study in Friday's edition of the journal Science, features a cylinder with two concentric layers. While the inner layer consists of a superconducting material that repels magnetic fields, the outer layer is a ferromagnetic material that attracts them.
Placed in a magnetic field, the device has no effect on the field lines, showing neither a shadow nor a reflection. So an object inside the device cannot be detected.
"There are many applications -- for some cars, ships or a submarine," said study co-author Alvaro Sanchez of the Autonomous University of Barcelona.
He told AFP the device could also be used for patients who have a pacemaker and need a MRI of a knee or other body part, so the image would not be distorted.
Because it is made from commercially available materials, as well as operating under relatively strong magnetic fields and relatively warm liquid nitrogen temperatures, the device could easily be put to practical use, according to the authors.
"For the submarine, you have to make a shell around the submarine that will make the submarine magnetically undetectable," said Sanchez.
"This could also be used to protect some (military and medical) equipment against electromagnetic disturbances."
(Excerpt) Read more at defencetalk.com ...
Degaussng technology has been around for 70 years.
Compared to liquid helium, yes. In the real world, it's still close to -200 °C.
No problem! I bet you are plenty cool under that overcoat! ;-)
(sounds a bit like Mormon underwear :)
Good to know, good to know. ;-)
There is no think tank comparable to Free Republic!
Sort of but more like Vulcan underwear and I'm the coolest cat in town
when I'm out and about in it.