Outdoor Tripwire Laser

[midacts]

Hey guys,

I was wondering if anyone had any suggestions for an outdoor tripwire. I was looking at having a laser that can point at least 1 mile. It will need to be bounced off of mirrors or something of that sort in order to go 90 degrees at corners of the perimeter.

My main concern is

-diffusion of the laser during the day
-bouncing the laser around corners of the perimeter
-potentially use a infrared laser (after testing with a green laser) so the tripwire cannot be seen

Do you guys have any suggestions. Is this something that will be difficult/impossible?

Thanks for your help

 

[joeyss]

You're gonna need at least a 10x or even 15x beam expander if you're working with that kind of range and a 5mw IR laser.

 

[midacts]

You're gonna need at least a 10x or even 15x beam expander if you're working with that kind of range and a 5mw IR laser.

So it is possible.
Would you use just one beam expander? And would you use it at the source (where the laser pointer is).
Also, is it okay to keep the laser running 24/7?
And (I haven't researched this part yet) do you think the laser will melt the laser detector on the arduino? I'm thinking I'll have to "filter" the laser before letting it hit the laser detector

Thanks for your reply.

 

[joeyss]

At the source.
And if it's a low powered laser than yeah.
5 mw won't melt anything.

 

[The Lightning Stalker]

Try doing a search. There are several
threads on this subject already.

 

[H2Oxide]

Also you could use multiple lasers and detectors to make things a bit easier. Then one bump won't throw the entire system off, just one side. Also, you might not have to get a costly expander, if the lasers have good divergence.

 

[joeyss]

Also you could use multiple lasers and detectors to make things a bit easier. Then one bump won't throw the entire system off, just one side. Also, you might not have to get a costly expander, if the lasers have good divergence.

He can use a pair of binoculars.

they work

 

[H2Oxide]

He can use a pair of binoculars.

they work

I'm assuming you mean for a beam expander?

 

[joeyss]

I'm assuming you mean for a beam expander?

Yes provided you adjust the focus right i.e to infinty.