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Terahertz Body Scanner: Does It Work?

05/15/2017 5:27 PM

Hello everyone,

Maybe someone good at this topic or met this problem before, because I was really confused reading about this

www.tera-sense.com

Can someone tell me: does it actually work? And how terahertz radiation can influence on the human body, considering that THz waves passing through variety of things, such as plastics, ceramics, composites etc.? Thanks in advance!

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#1

Re: Terahertz body scanner: does it work?

05/15/2017 5:51 PM

Yes. TSA audits indicate they're extremely effective at not catching terrorists. However, they will detect your suspiciously-hidden water bottle and your sweaty shirt.

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#4
In reply to #1

Re: Terahertz body scanner: does it work?

05/15/2017 6:22 PM

They have issues, but like most things they are NOT a one-stop-shop detection system, they are merely a tool to be used in conjunction with a lot of other tools to help keep us safe.

Every tool has it's limits and weaknesses, that's why you don't just rely on one. Remember, the standard metal detector won't detect non-metallic objects and explosives.

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#7
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Re: Terahertz body scanner: does it work?

05/16/2017 8:57 AM

Terrorists only respond to X-rays. That is in a totally different band of the spectrum.

Actually, we are walking around in low intensity terrahertz radiation all the time.

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#2

Re: Terahertz body scanner: does it work?

05/15/2017 6:17 PM

This technology is becoming more common for scanner applications, mostly object (not person) scanning. Yes it works, yes its safe.

Ever been to an airport recently, you may have seen or experienced one of these?

Full_body_scanner

People aren't moaning about safety, but because the scan resolution is high enough to cause modesty and privacy issues.

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#6
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Re: Terahertz body scanner: does it work?

05/15/2017 8:03 PM

The one I went through displayed a human outline, not an actual image at THz resolution. I saw displayed on the figure highlighted areas - blobs of a cyan-ish colour indicating 'regions of interest,' in my case areas on my shirt (most noticeably an oval-shaped area in the middle of my back) wet with sweat. I'd just come in from outside on a very hot day and I'd worked up a sweat walking some distance through the parking garage. That's what it found: sweat, so they took me aside, patted me down and scanned me with a wand. You could see them doing that with just about everybody. Lots of false alarms, but no revealing imagery. With as much work as the thing was causing them - not to mention all the delays the thing incurred - I have to wonder about its actual usefulness. They could have just cut straight to their Pat 'n' Wand Morning Show and saved everyone a lot of wasted time.

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#32
In reply to #6

Re: Terahertz body scanner: does it work?

05/17/2017 7:15 PM

Andrew, thanks a lot for your described case! It's still very interesting for me, actually which type of scanner it was? Do you have some ideas? Maybe it was a mm-waves full body scanner...

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#34
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Re: Terahertz body scanner: does it work?

05/19/2017 11:26 AM

I'm pretty sure it was one of these.

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#3

Re: Terahertz body scanner: does it work?

05/15/2017 6:22 PM

..."The efficacy of millimeter wave scanners in detecting threatening objects has been questioned. Formal studies demonstrated the relative inability of these scanners in detecting objects—dangerous or not—on the person being scanned.[22] Additionally, some studies suggested that the cost–benefit ratios of these scanners is poor.[23] As of January 2011, there had been no report of a terrorist capture as a result of a body scanner. In a series of repeated tests, the body scanners were not able to detect a handgun hidden in an undercover agent's undergarments, but the agents responsible for monitoring the body scanners were deemed at fault for not recognizing the concealed weapon.[24]

Millimeter wave scanners also have problems reading through sweat, in addition to yielding false positives from buttons and folds in clothing.[25] Some countries, such as Germany, have reported a false-positive rate of 54%.[26]"...

Confidence is low....

https://en.wikipedia.org/wiki/Millimeter_wave_scanner

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#5
In reply to #3

Re: Terahertz body scanner: does it work?

05/15/2017 6:44 PM

They only have to prevent someone from trying . . . .

It's akin to the ADT sign on your front lawn.

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#9
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Re: Terahertz body scanner: does it work?

05/16/2017 3:42 PM

The cost-benefit ratio may not be attractive, even if it does deter or delay some would-be terrorists.

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#11
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Re: Terahertz body scanner: does it work?

05/16/2017 4:49 PM

It's hard to prove a negative

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#12
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Re: Terahertz body scanner: does it work?

05/17/2017 6:33 AM

Hmm. So do you find the negative statement, "Proving a negative isn't as hard as disproving a negative" difficult/easy to prove? ....disprove?

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#14
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Re: Terahertz body scanner: does it work?

05/17/2017 9:09 AM

We are supposed to somehow follow that/those statement(s) with some form of coherent answer? How many drinks did you have before writing that?

Accentuate the positive, forget the negative.

Offer a logical theorem stating your answer in concise mathematics, please, some of us do not understand Tauran language.

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#17
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Re: Terahertz body scanner: does it work?

05/17/2017 10:29 AM

Proving a negative can be trivial if possible. Disproving a negative, on the other hand, often can be impractical if not impossible.

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#20
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Re: Terahertz body scanner: does it work?

05/17/2017 10:39 AM

Alright, disproving a negative seems difficult, so what about non-confirming a contrapositive?

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#26
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Re: Terahertz body scanner: does it work?

05/17/2017 12:19 PM

Ah, I can non-confirm with my eyes closed.

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#27
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Re: Terahertz body scanner: does it work?

05/17/2017 12:21 PM

Pix or it didn't happen!

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#33
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Re: Terahertz body scanner: does it work?

05/17/2017 8:55 PM

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#31
In reply to #5

Re: Terahertz body scanner: does it work?

05/17/2017 4:46 PM

After reading many of the comments above yours, I doubt a terrorist will be concerned about this type of scanner.

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#8
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Re: Terahertz body scanner: does it work?

05/16/2017 9:01 AM

Why not just go straight to the X-ray line, or a large magnet. I am sure the magnet will remove most metallic objects like steel knives or guns. The problem is reduced by X%, then you have the ceramic and plastic, and non-magnetic metal objects to remove next. Maybe instead of pat-down, just have people strip off, walk over, and put on a decency uniform for travel, then on they go, with the clothes being scanned, searched, etc.

The really suspicious ones, have them step under the giant hammer for a complete smack-down.

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#10
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Re: Terahertz body scanner: does it work?

05/16/2017 4:31 PM

"The really suspicious ones, have them step under the giant hammer for a complete smack-down."

I suspect that would eliminate most TSA employees.

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#13

Re: Terahertz Body Scanner: Does It Work?

05/17/2017 8:53 AM

I wonder how a terahertz high voltage would looks like. I guess probably just a dc bus.

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#15
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 9:15 AM

Why don't you take a peak inside the wave guide and find out!

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#16
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 10:27 AM

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#19
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 10:38 AM

That would only be a high powered Terra hurts bus if it were loaded with angry Marines.

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#21
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 10:53 AM

If you've ever pulled a strip of adhesive tape (Scotch 810 works great) off something, you've already experienced terahertz radiation. A broad peak at 2 THz, then a dip, then steadily increasing to a second peak at 18 THz.

They don't call it 'Magic' tape for nothing.

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#22
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 10:59 AM

Does it give you a tingly feeling all over, if not, I think it is overrated.

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#23
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 11:12 AM

You could give TSA tingly feelings all over if you used it to jack with their whole-body scanners at the airport. Issue a roll to everyone standing in line. zip zip zip

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#24
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 12:08 PM

That sounds like fun, where do we all sign-up?

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#25
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 12:17 PM

Be sure to wear roller skates to expedite their dragging you off the plane.

Oh wait, you're not a Chinese doctor are you?

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#28
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 12:25 PM

I am probably already on a no fly list, unless I go private. They hate me. I am a man, and I am white, and I am from Texas, so there's three strikes. The last time I flew, I had this uneasy feeling from the TSA dude that kept just standing there staring me down while we waited for the boarding call. I really want nothing to do with airports, or arseholes.

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#30
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Re: Terahertz Body Scanner: Does It Work?

05/17/2017 12:52 PM

He was probably wondering why a P-38 Lightning would be trying to board a plane and not just fly directly to its destination.

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#29
In reply to #21

Re: Terahertz Body Scanner: Does It Work?

05/17/2017 12:31 PM

So if I peel tape in a vacuum, xrays are produced, but in normal atmosphere, Thz waves are produced? Interesting.

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#18

Re: Terahertz Body Scanner: Does It Work?

05/17/2017 10:31 AM
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