Weird TGP results

[Geskes]

Yes, of course. NVG's. ;)

[Wolf Rider]

Reflected light (or sound/ any frequency really) = glare and glare is a mish mash of different frequencies @ different angles, complete with frequency cancellations in some cases. (toss a rock into a pond/ pool/ tank/ etc and watch what the ripples do when they bounce off the edges of the pond)

 

To see a laser beam with the eye, dust/ particles are needed for the beam to light up/ reflect off... in clear air/ dust free environment, a beam won't be seen but the dot on the target/ wall will be.

Edited November 19, 2011 by Wolf Rider

[jazjar]

Exactly ethereal, the ir emitter on NVGs can only be seen when it reflects off other things, just like the laser on the TGP

[BlueRidgeDx]

I've seen a few videos where you can see the laser spot. I have no idea what wavelength the cameras were operating in, but I assumed it was IR.

 

Here's one, right from the source at LM:

 

http://www.lockheedmartin.com/products/pavewayIIpluslaserguidedbomb/Video_01.html

 

Edit:

 

Here's another:

 

Edited November 20, 2011 by BlueRidgeDx

[Geskes]

In those movies maybe IR pointer was also used

[BlueRidgeDx]

Perhaps, but it seems a bit silly to use an IR pointer in the daytime against a pre-planned target.

[jazjar]

Geskes, no the IR pointer is visible like it is because it reflects off of particles in the air, so the entire beam is visible. I have a pretty good understanding of what comes out of a laser, that is that the beam is in the electromagnetic spectrum under a specific frequency range called infared. This reflects off of matter just like anything else, and this is why it is visible by the NVGs

[Geskes]

I have a pretty good understanding of what comes out of a laser, that is that the beam is in the electromagnetic spectrum under a specific frequency range called infared. This reflects off of matter just like anything else, and this is why it is visible by the NVGs

 

I also have a pretty good understanding of what come out of a laser, and it is light, usually of a single wavelength.

But lasers are not necessarily in the IR spectrum, if they were you weren't able to see any of them, also not the cool ones they use in clubs.

 

The fact that the beam reflects alone doesnt make it visible by NVG's, they need to be able to detect that particular wavelength.

 

If you make the particles in the air large enough (eg. smoke), you can also see the beam of a normal red/green visible laser, but if you cannot detect the wavelength the laser is operating in with the device (nvg/mk1) , you cannot see the beam nor the reflection of the dot.

[jazjar]

How do you know that the wavelength of the TGP laser doesn't match the wavelength detectable by the NVG?

[Olgerd]

How do you know that the wavelength of the TGP laser doesn't match the wavelength detectable by the NVG?

 

Third generation ANVIS NVGs work in the range of 570-930 nanometers.

 

Litening TGP has three types of lasers:

- Non-eyesafe (combat) laser - 1064 nanometers.

- Eyesafe (training) laser - 1570 nanometers.

- Laser marker (IR pointer) - 808 nanometers.

[Geskes]

How do you know that the wavelength of the TGP laser doesn't match the wavelength detectable by the NVG?

 

Because Olgerd just posted the wavelengths here :P

[dok_rp]

Third generation ANVIS NVGs work in the range of 570-930 nanometers.

 

Litening TGP has three types of lasers:

- Non-eyesafe (combat) laser - 1064 nanometers.

- Eyesafe (training) laser - 1570 nanometers.

- Laser marker (IR pointer) - 808 nanometers.

 

Ah, the blessing of information. The best way to clear up, I think that... I believe that... my dad told me that...

Thanks for your ever-presently-doubt-solving post, Olgerd. :smartass::smartass::smartass:

 

+1 REP on the way... :thumbup:

 

.

[Evil.Bonsai]

Wow, I really did not expect the conversation to take the route it did.

 

And for the record, I'm pretty sure NVGs do not have IR emitters. :)

[Rainmaker]

Finally, maybe people will stop arguing over this....

[jazjar]

Ummm, yes they do. For no light situations, most soldier mounted NVGs will have an active infared emitter mounted, for the record :). And thank you for that informative post, Olgerd, you had us wondering there.

[Evil.Bonsai]

Ummm, yes they do. For no light situations, most soldier mounted NVGs will have an active infared emitter mounted, for the record :). And thank you for that informative post, Olgerd, you had us wondering there.

 

Er...was thinking laser not emitter. Redact, please. :music_whistling: