Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Green laser beam can't penetrate fog

o_DEATH_ANG3L_o

o_DEATH_ANG3L_o

0
Joined
Sep 7, 2007
Messages
634
Points
0
So I was doing a little testing with my 35 mW advanced. I filled one of those 5 gallon Culligan water jugs up with fog. I then shot my laser beam through it. I noticed that the beam did not come out the other side. It also did not get reflected back. Where does it go?? I have also noticed this on really foggy nights. If you point it to the sky you can literally see it stop. Well if anyone knows what I mean or has any helpful insight on this situation, please share it.
 





N

nes_ds

0
Joined
May 16, 2007
Messages
289
Points
0
I can't scientifically explain how the light is dissipated, but to explain how the beam seems to stop in the air, it's simple. The beam doesn't just stop, it simply travels beyond your field of view.
 
S

stevetexas

0
Joined
Feb 8, 2007
Messages
609
Points
0
multiple reflections from small particles each diffusing the beam will prevent the beam from passing. It will seem to absorb the beam when it is really just diffusing it.
 
L

likewhat

Guest
The light is scattered by the particles, It is called to Mie scattering when the particles are >> wavelength like in fog.
 
C

Chief-Eamonn

0
Joined
May 6, 2007
Messages
419
Points
0
you cant see through a wall youll also notice that your laser wont shine through it the fog blocks out the light thats all i got. :D
 
A

Aseras

0
Joined
May 25, 2007
Messages
534
Points
0
The beam is still there, hold you hand on the far side of the jug and it should still light up green. the beam just spread out too far to be seen, but the light should still be going unless your jug is opaque....
 
o_DEATH_ANG3L_o

o_DEATH_ANG3L_o

0
Joined
Sep 7, 2007
Messages
634
Points
0
Well the jug is more like a dark blue but yet it is clear in a way. Yeah I can barely see the shine of the green when I put my hand on the other side. Very cool though. ;)
 
Benm

Benm

0
Joined
Aug 16, 2007
Messages
7,896
Points
113
likewhat said:
The light is scattered by the particles, It is called to Mie scattering when the particles are >> wavelength like in fog.
Click to expand...

What happens depends on the color of the particles, given that they are >> the wavelenght. The water droplets in fog reflect (scatter) the light to a great degree, while particles in smoke (think of and old diesel) absorb most of the light.

For particles << the wavelenght, this works differenty as such particles technically don't have a color.
 
You must log in or register to reply here.




Top