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Lasers and true diy sensors

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0001bc:
I don't suppose powermax or vistas or other systems reviewed on this board offer or support laser sensors?  Preferably, wireless laser sensors.

But, if not, has anyone successfully tried engineering their own custom sensor - such as a home-made laser, pressure, temp, timer, moisture, etc - and loop wiring it to a wireless transmitter, like the honeywell 5816?

MmmDee:
So long as the sensor produces a normally open or normally closed contact closure, it doesn't matter how the trigger occurs.  There are a number of beam sensors that use IR, so I suppose there are some that use laser as well.  Laser may be called for in extreme distance situations, but I suppose they're not usually used due to the artificial smog detection strategy you see used on spy movies.

While you probably can make any number of DIY sensors, due to mass production it's often cheaper and probably more reliable to use commercial products.   It comes down to, I suppose, whether you want a toy, or a real system.

MmmDee:

--- Quote from: david1987 on January 03, 2010, 11:47:00 PM ---Kindly visit


http://www.sensor.dk/?pid=19

--- End quote ---

Lasers have long been used in distance measurement, but the cited link does not show lasers used in perimeter violation detection.  No doubt a couple of the obstacles of lasers in the DIY alarm business application include the liability of injury to an eye should someone cross the beam and claim injury resulting from the beam shining in their eyes.  Secondly, it's likely somewhat difficult keeping a focused beam of light steady enough over a resonably sized detector over a large distance... you probably wouldn't be able to just mount two poles into concrete 300 feet apart and be able to keep the laser beam focused on a detector.  There are IR photobeams good to 300 feet, but that's made somewhat easier because an IR beam doesn't stay as focused.  I don't know if the commonly available commmercial IR photo beams are modulated with a signal, but you'd most likely want a laser beam system modulated to keep someone from simply shining a laser pointer into the detector to defeat it.

In a commercial situation, for example protection in a more stable environment such as a musem, laser beam detectors may be more prefered due to better boundary definition (multiple beam/detector pairs won't interfere with others) and less IR light to potentially degrade antiquities.

KSSPA:

--- Quote from: david1987 on January 03, 2010, 11:47:00 PM ---Kindly visit


http://www.sensor.dk/?pid=19

--- End quote ---

Was it really necessary to drag up a 6 month old post to provide a link that has nothing to do with the subject?

Bunited2:

I'm going to re drudge up this subject only for the simple fact I
did do a laser system once.

One of my customers was a satellite manufacturer, and they wanted
me to somehow protect the surrounding mountainside around one
of their downlink sites.

This was years ago when the only way at the time for video was to
actually do a dialup transmitting system.

I did a few lasers and just used simple photocells facing the laser
through a tube.

It worked for them, if it was tripped it was either fog or deer and they
could check the transmitted video before sending security to the remote
site.
_________________________________________________________

Today I would use different equipment, to achieve a more reliable
system.

As far as I know there were no deer being blinded or having their
legs cut off from the lasers.

Bunited2

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