Infrared "seeing" glasses

r8nd0m · Aug 7, 2007

I've seen these on eBay for a while, and recently decided to ask the seller about them. I asked if they could allow me to see the beam of an 808-980nm laser. They replied that the glasses could "see" wavelengths from 700-1000nm.

I still don't believe it is true. So, does anyone know whether or not these glasses work with infrared lasers?

Xenodius · Aug 7, 2007

If thats true, I would totally get some! Blue skin? C'mon!

Inclined to doubt it, however I doubted the 3d glasses for my PC that are currently sitting on a shelf... I shelled out the 40 bucks anyway... and OMG! It was so freaking cool! I was the only one who could see what was going on though! Scatters the picture ;D ;D

yew.sir-name · Aug 7, 2007

these may be good for seeing if your laser puts out ir but i doubt they would protect your eyes. did they not used to sell x-ray/spy glasses in the back of comics years ago? like during the 70's

pseudonomen137 · Aug 7, 2007

Can anyone say bull****?

No, they do not work. From what I heard, the way they are intended to work is by blocking out most visible light thats not IR, so your eyes are more sensitive to near-IR light. Basically, you might as well just cover your eyes and imagine you're seeing IR - it'd work about as well and save you a few bucks.

r8nd0m · Aug 7, 2007

pseudonomen137 said:
Can anyone say bull****?

No, they do not work. From what I heard, the way they are intended to work is by blocking out most visible light thats not IR, so your eyes are more sensitive to near-IR light. Basically, you might as well just cover your eyes and imagine you're seeing IR - it'd work about as well and save you a few bucks.

Thanks for the answer, I thought they were fake.
I would've believed them more if it weren't for the seller's different descriptions such as: ***EXTRA STRENGTH** SOLE INVENTOR & MOST ALLOWED BY LAW , STATE OF THE ART TECHNOLOGY! MAXIMUM STRENGTH , X-RAY INFRARED VISION EYE GLASSES THERMAL FLIR HEAT LCD, X-ray IR GLASSES Infrared SPY CAM goggles ultrasonic, and X-RAY VISION GLASSES for LASER ARGON ULTRASONIC DPPS.

Aseras · Aug 8, 2007

You can see IR, the visible spectrum just drowns it out. Same reason why green looks so bright and red looks pathetic, even if the red is 10x as strong as the green.

You can do your own http://amasci.com/amateur/irgoggl.html if you feel like it.

Here's the catch though, [highlight]you do NOT want to use these to view a IR laser.[/highlight]

Your eyes are going to dilate since they believe it's dark, and you go cramming nigh invisible light in there and you are asking for trouble. It's like wearing dark sunglasses at night.. the stuff that is lit will be visible, but everything else is going to be dark.

Things · Aug 8, 2007

ULTRASONIC!?!?!?!? how the hell do you see ultrasonic!!?it's a sound frequency!!?

wilheldp · Aug 22, 2007

things said:
ULTRASONIC!?!?!?!? how the hell do you see ultrasonic!!?it's a sound frequency!!?

That's like a friend of mine asking where he could get some pneumatic fluid. I assume he meant hydraulic fluid, but the smartarse in me couldn't resist, so I told him "Everywhere".

steve001 · Aug 23, 2007

Aseras said:
You can see IR, the visible spectrum just drowns it out.

Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.

Get the point ?

pseudonomen137 · Aug 23, 2007

He meant near-IR I believe. Technically you can even see some into the IR range, but the intensities needed to be visible would obliterate anything it would be visible off of anyway

steve001 · Aug 23, 2007

pseudonomen137 said:
He meant near-IR I believe. Technically you can even see some into the IR range, but the intensities needed to be visible would obliterate anything it would be visible off of anyway

Can you provide a citation

pseudonomen137 · Aug 23, 2007

steve001 said:
[quote author=pseudonomen137 link=1186500381/0#9 date=1187885103]He meant near-IR I believe. Technically you can even see some into the IR range, but the intensities needed to be visible would obliterate anything it would be visible off of anyway

Can you provide a citation
[/quote]

What is this, wikipedia?

Honestly, I'm too lazy but feel free to look it up with either the CIE photopic luminousity function, or Sam's laser FAQ. I know I've seen visibility specs mentioned in the 700 - ~1000nm range in Sams.

Aseras · Aug 24, 2007

steve001 said:
[quote author=Aseras link=1186500381/0#5 date=1186532148]You can see IR, the visible spectrum just drowns it out.

Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.
Let's not past out incorrect info . You cannot see IR light with the naked eye. If you can see light it's not IR. It's that simple.

Get the point ?
[/quote]

You can see all NIR and a very slight amount of the IR range up to about 1400nm. You just have to use special filters to remove all visible light. Also it really depends on the composition of the indivuals eyes. Just like how some people can taste PTC and some can't, some can see IR much better than others. In fact most people who are "colorblind" often see IR very well. There's been many studies where colorblind people can make out very good object in camouflage because they percieve the difference in the IR reflectivity. Most natural vegetation reflects almost all the IR light it is exposed to.

steve001 · Aug 24, 2007

Aseras said:
[quote author=steve001 link=1186500381/0#8 date=1187882338][quote author=Aseras link=1186500381/0#5 date=1186532148]You can see IR, the visible spectrum just drowns it out.

You can see all NIR and a very slight amount of the IR range up to about 1400nm.
Ok' I did a lot of poking around and the limited for human vision appears to be 750nm. There is one reference out to 780, but anything beyond that is invisible because the eye does not contain receptors sensitive to longer wave lengths
You just have to use special filters to remove all visible light.suppose I hunker down in a cave that would essentially be the same as using filters. I guaranty you'll bump your head or stub your toe because you can't see even though there is IR all around Also it really depends on the composition of the indivuals eyes. Just like how some people can taste PTC and some can't, some can see IR much better than others.
The eye does not contain receptors sensitive to longer wave lengths
In fact most people who are "colorblind" often see IR very well. There's been many studies where colorblind people can make out very good object in camouflage because they percieve the difference in the IR reflectivity.
Anecdotal, humans have not evolved receptors to see IR. They see something but it's not IR I bet.
Most natural vegetation reflects almost all the IR light it is exposed to.?
There are quite a few sites indicating ir starts at 700nm[ one even said at 690nm] and just as many saying ir starts after the visible part of the spectrum. Seems it's not a well defined area. It makes sense that any visible light no matter how long the wavelength is, is part of the visible spectrum and not part of the ir portion and should be defined as such. It seems this is a matter of semantics.
[/quote]

Benm · Aug 24, 2007

Most textbooks peg the visible range at 700-400 or 800-400 nm, and anything below 700 or 800 is hence considered IR. In reality light over 700 nm is surely visible under the correct conditions, and even over 800 nm will be.

There could be a better definition of the boudrary, for example chosing the point where light is 100 times less visible that at the maximum visibility wavelenght (555 nm or so). That definition would end up close to the 700 nm mark, but it would be more clear what the boudrary actually means.

As for those glasses: if they're just lowpass filters, they wouldn't have any amplification, and IR would be as visible as it would be in a dark room. Looking at/into IR lasers of reasonable power with full dilated pupils would be one of the dumbest stunts ever.

pseudonomen137 · Aug 24, 2007

steve001 said:
Ok' I did a lot of poking around and the limited for human vision appears to be 750nm. There is one reference out to 780, but anything beyond that is invisible because the eye does not contain receptors sensitive to longer wave lengths

Steve, I think you have a lot more poking to do. I know for a fact Sam's laser faq has references to very low visibility specs into the 900-1000nm range.

Better than any random citation though, you CAN see 808nm... I can see 808nm. Don't believe me? Buy one of my IR pen lasers. I've even seen the BEAM of an 808nm before, although we are talking several Watts and lots of fog.

If you're buying a lightbulb, sure, it entirely impractical to consider any output past 750nm. When we're talking about shoving hundreds of mW into areas just a few mm in diameter though, even 808nm is unmistakably visible.

Actually, check out this vid: http://youtube.com/watch?v=31LfI4k9MA8
The 400mW 808nm spot is pretty true-to-life to my vision (its very dim, but there's no doubt its there)

Infrared "seeing" glasses

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