IR lasers are restricted by the FDA as complete units, but you can buy components yourself.  Nevertheless, be careful with them, as inadventent reflection or direction into an eye will be very very destructive - Think 'pop'.  Human eyes don't respond to the IR like they would a red laser, so the natural defense mechanisms (which are still comprimised by laser anyway) don't work.  I work with a guy missing an eye from a 5mw IR laser.

Be safe,

On 4/25/07, Carl Friedberg <friedberg@comets.com> wrote:

> Does anyone have experience setting up a laser (make-break) beam grid
> on
> an outdoor property?  Someone has a large property that would be
> infeasable to cover with motion / camera solutions, but would like an
> alert if something is present.
> I have used laser (make-break) detectors indoors for various
> projects, but
> would like to extend it to ourdoors using mirrors mounted on stakes
> reflecting back and forth across the property.  Im wondering about
> performance with Rain / Fog / etc.

I can't say about the outdoors at all, but InfraRed has the
virtue that you don't (normally) see the beams. Why is that
I have an image of Tom Cruise squeezing over or under those

I know infra-red might have fog and rain issues.

When I was a kid, my dad ran a factory. He had ADT install a
detector system, which was state of the art for the 50's: an
infra-red sender and receiver in front of all of the windows.
It worked really well; there were almost no false alarms, and
it went off every time someone had broken in.

Of course, this might have some drawbacks if there are llamas
or kanagroos running around the yard...

Carl Friedberg

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