[Laser] Re : 5mw laser transceiver kit

[f1avyopto at aol.com]

By night to adjust an infrared laser link we used twosmall IR cameras mechanically fixed to the lasers frames.
These cameras have been first modified with new bigger objectives to be moresensitive.
Each camera is connected to a video monitor.
We first beam the lasers on a far away clear target (to avoid parallax) and we mark thelaser spots pictures on the screens with a pencil.
Next step, each station uses powerful lamps as beacons.
If you beam the receivers with  classical device system (reticle on optical device) to the beacons, the RX aimingis done.
If you beam the laser so that the beacon pictures are on the pencil marks, on the video monitors, theTX aiming is done.
You can have more details about the way to aim a NLOS infrared com at the end of this presentation :
http://sd-1.archive-host.com/membres/up/22679775843705539/GBVUK.pdf
73 Yves F1AVY 
  
 


I have yet to figure out how someone aligns an IR system over a long
path like over 10 km or more. How do you guys do it?


 

 


 

 

-----E-mail d'origine-----
De : Zack Widup <w9sz.zack at gmail.com>
A : Free Space LASER Communications <laser at mailman.qth.net>
Envoyé le : Jeudi, 30 Septembre 2010 15:40
Sujet : Re: [Laser] 5mw laser transceiver kit


I have yet to figure out how someone aligns an IR system over a long
path like over 10 km or more. How do you guys do it?

73, Zack W9SZ


On 9/30/10, Tim Toast <toasty256 at yahoo.com> wrote:
> no? .freaky... A watt of 830nm light can't be felt on the skin. I assume
> that's spread out to one inch diameter or so. That sort of brings up an
> interesting point about sunlight when comparing it with other sources i
> guess. That 1000 watts per square meter, or 0.1 watts per sq cm, that you
> feel on your skin from the sun, is mostly due to light in the longwave
> infrared portion of the spectrum.
>
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Wed, 29 Sep 2010 19:18:36 -0400
>> From: Tom Becker <GTBecker at RighTime.com>
>> Subject: Re: [Laser] 5mw laser transceiver kit
>> To: Free Space LASER Communications <laser at mailman.qth.net>
>> Message-ID: <4CA3C94C.6030403 at RighTime.com>
>> Content-Type: text/plain; charset=ISO-8859-1;
>> format=flowed
>>
>>   > ... Is there a point (right in front of the
>> illuminator) where it
>> feels like sunlight on your hand?
>>
>> No, but mine's a 63-year-old hand. :)  If you mean a
>> sensation of
>> radiated heat, no, not from the barrel illuminator.
>> Thermal IR is a
>> long way from 850nm.
>>
>
>
>
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
Laser mailing list
Home: http://mailman.qth.net/mailman/listinfo/laser
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Laser at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html