Esteban was right!

[Seden]

Good citizens,

I was reading on the Photonics Newsletter today and scientists are using lasers to detect chemicals in boxes at over a 100 meters. Even inside walls detection is possible with lasers and at the end of the article it mentions using it for geological detection. Look here:

http://www.photonicsonline.com/artic...ource=nl:33421

Long distance Raman Spectroscopy,this is great.

Randy

[WM6]

Originally Posted by Seden

Good citizens,

I was reading on the Photonics Newsletter today and scientists are using lasers to detect chemicals in boxes at over a 100 meters. Even inside walls detection is possible with lasers and at the end of the article it mentions using it for geological detection. Look here:

http://www.photonicsonline.com/artic...ource=nl:33421

Long distance Raman Spectroscopy,this is great.

Randy

Nothing new.

Look at this 7 years old stuff:

http://www.signonsandiego.com/uniont...n27detect.html

[Seden]

Here's what IS new:
" a new method has now been developed to detect chemicals inside a container over a distance of more than a hundred meters."

The 7 year article does not make that claim.

Randy

[Geo]

Some times when i said that i saw a laser lrl that had the ability to detect objects from 70m, some members here irony me. So maybe it is time to read again all the threads from begin.
Also i own a laser lrl.

Regards

[WM6]

Originally Posted by Geo

Some times when i said that i saw a laser lrl that had the ability to detect objects from 70m, some members here irony me. So maybe it is time to read again all the threads from begin.
Also i own a laser lrl.

Regards

Geo, there is no need that something what is working fine in theory and some lab tests, work the same in real world of your needs.

If your laser LRL is Bionic, it is useless (and at the same time very expensive) box usable as toy only.

[humhum]

Originally Posted by Geo

Some times when i said that i saw a laser lrl that had the ability to detect objects from 70m, some members here irony me. So maybe it is time to read again all the threads from begin.
Also i own a laser lrl.

Regards

Hi Geo, can you post some photos from your laser lrl.

[Geo]

Originally Posted by humhum

Hi Geo, can you post some photos from your laser lrl.

Hi.
Here is the first version of my laser detector. Final version has some mod's... but i have not photo from it

[WM6]

Originally Posted by Seden

Here's what IS new:
" a new method has now been developed to detect chemicals inside a container over a distance of more than a hundred meters."

The 7 year article does not make that claim.

Randy

If it can be mounted even on aircraft, this mean from great distance and it can be understood by itself that all landmines are in "containers" and not in form of free bulk explosive.

"The machine also could be mounted on an armored vehicle, on a robot or aboard a small unmanned aircraft.
Tong hopes to develop an instrument that can detect explosives from 110 yards away .."


But main problem with laser spectral detecting small amount of molecules at distance in real world (out of clean lab atmosphere) is that with distance we get huge and uncontrollable amount of unwanted molecules in air which totally cover and eliminate wanted molecules from detection.

[nelson]

Hi WM6

I agree with you on this, but if the device can have some sourse of discrimination like notch on MD, may be you can set it to detect only explosives particles.

I also will like to know how smoke detector for example detects smoke particles and no more than smoke? Is clear that this device is made to work only with smoke, but can this be mod to work to detect other kind of particles?

Regards

Nelson


But main problem with laser spectral detecting small amount of molecules at distance in real world (out of clean lab atmosphere) is that with distance we get huge and uncontrollable amount of unwanted molecules in air which totally cover and eliminate wanted molecules from detection.[/QUOTE]

[WM6]

Originally Posted by nelson

Hi WM6

I agree with you on this, but if the device can have some sourse of discrimination like notch on MD, may be you can set it to detect only explosives particles.

I also will like to know how smoke detector for example detects smoke particles and no more than smoke? Is clear that this device is made to work only with smoke, but can this be mod to work to detect other kind of particles?

Regards

Yes, nelson, effectively it works like notch (of course with other technical solution) but notch we use in vicinity detectors and laser we tend to use as long range detectors.

Notch is usable in relatively clean soil. In soil full of different trash that cover wanted target signal, notch become completely unusable.

The same situation we get with laser at distance. We have 2 or 3 usable molecules at say 100m but before laser beam reach those molecules, beam hit billions of other trashy molecules in air, which give back totally mess of interference chaos and cover usable signals, if it was even created.

Smoke particles detector is another story, it cannot differentiate between different source of smoke.