[Laser] NLOS Optical Comms

[Andrew T. Flowers, K0SM]

James,

I have some charts and pictures that F1AVY sent me showing scatering 
angles vs wavelength for various media.  I'll see if I can dig them up.  
He also send me a picture of what appears to be IR scattering off of a 
light fog/haze.  He's had some success with this stuff but I'll try to 
get details out of him to figure out what the parameters and conditions are.

Andy K0SM/2


TWOSIG at aol.com wrote:

>I hope this is thinking outside of the box instead of thinking way off the 
>mark:
>
>It seems to me that if the intent is to provide non-line-of-sight 
>communications, then we should be thinking in terms of scatter instead of transmission.  
>I have been thinking in terms of LOS, so I use red.  If I wanted NLOS, the 
>efficiency of the scatter would be one of the first things to consider.
>
>If the sky is blue instead of pink because the blue light scatters better 
>than red, should we look for light that is blue instead of red, or infra-red?
>
>For that matter, does blue scatter so well in the upper atmosphere only?  My 
>intuition says no, but maybe there is data.   I recall seeing a chart of 
>frequencies where the atmosphere is transparent, but where it is "NOT" transparent, 
>is it absorbtive (which would not help NLOS) or is it dispersive?
>
>I hope this helps.
>
>James
>N5GUI
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