see through cloths froma mile away

[dragon]

Well not really but still cool none the less.

Someone may soon be able to tell what types material are in your pockets from tens, and possibly thousands, of feet away.

Using terahertz remote sensing, detectors could see through walls, clothing and packaging materials and immediately identify the unique terahertz waves of the materials contained inside, such as explosives or drugs.

Until now, detecting terahertz waves - the portion of the electromagnetic spectrum between infrared and microwave light - hasn't been possible from distances more than inches because the waves are absorbed by ambient moisture in the air, killing the signal.

"A lot of other researchers thought that terahertz remote sensing was mission impossible," said physicist Jingle Liu of Rensselaer Polytechnic Institute, lead author of the study published July 11 in Nature Photonics.

Liu's team solved the problem by not relying on the terahertz waves themselves to generate or carry the signal back to the detector. Instead, they used the reflection created by lasers pointed at the target.

Two lasers at different frequencies aimed at the target together generate a plasma (basically excited, or ionized air). This plasma emits a florescence that is scattered in characteristic ways by the terahertz radiation of the material it hits. The reflection of the florescence is detectable from remote distances

The researchers have tested hundreds of different substances and created a library of terahertz spectra to compare to the signal from the target and instantly identify the material that was hit.

The researchers demonstrated that they could detect the signal from 67 feet away, the length of their laboratory space, but theoretically they could identify materials hundreds of feet or even miles away, Liu said.

"Homeland security and military agencies have been struggling for years to get technology like this," said terahertz expert Abul Azad at Los Alamos National Laboratory. "I think the approach they have revealed is really, really unique."

The first application of this technology will likely be for the remote detection of roadside bombs, also known as improvised explosive devices (IEDs) by the military. Homeland Security and the Defense Department were the primary funders of the research.

Terahertz detectors could also be used for airport security to detect illegal substances hidden in people's clothes. The approach would be less invasive than x-rays, Liu said, because terahertz waves are much lower in energy. It would not reveal anything concealed inside the body, because the terahertz signals cannot go through water, or metal.

Theoretically, Liu said, terahertz remote sensing could also be used identify the composition of an unknown toxic spill in the environment, or the composition of objects in space.

link

[PaperJack]

So they create plasma ?
Wouldn't that, like, ignite things ?

[Norade]

So they create plasma ?
Wouldn't that, like, ignite things ?

No, do try to understand the things you're talking about before you post.

As for the OP, that's some really cool kit. I wonder how small they could get it down to.

[PeZook]

It's too bad it can only work on one target at a time ; Wouldn't it be awesome if you could put a sensor in an airport and it would go "WARNING BOMB" and highlight the guy carrying it?

Of course, if you just mount it somewhere like a security checkpoint, it ceases to be a problem.

Couple it with a future wireless taser and you have an extremely potent security device

[Samuel]

So they create plasma ?
Wouldn't that, like, ignite things ?

No, do try to understand the things you're talking about before you post.

As for the OP, that's some really cool kit. I wonder how small they could get it down to.

Basically plasma is the state of matter next to gas. It tends to be extremely hot, but if you have a small amount/something that doesn't conduct heat well, it is safe.

[Zixinus]

Plasma is a pocket of ionised air. It's very fickle and under Earth conditions, it is impossible to maintain for a long amount of time.

That is what the lasers create, if I understand correctly: they create a small pocket of ionised air that reacts to the reflection of the terahertz waves and from what they can gain information.

Very cool stuff.