We are
looking at a multi-faceted approach to security at our cottage in the country. It's been a long time since I looked at laser beams, so I was surprised to see that they are available in Cape Town for a mere R15
/
$1.50 each. Laser beams are an ideal security solution (an invisible fence), except for one drawback: they need to be very firmly and accurately mounted, which is time-consuming. And a smaller problem (assuming one knows how to address it): laser beams need to be "immunised" against falling leaves, flying insects, and so on, which need to be distinguished from humans.
3 comments:
Mind the modulations in the light of the sun. I got Bad experiences with it. The sun causes lots of alarm, if the modulation of the light-waves is not specially fixed.
Thank you for your comment. There might be a non-electronic solution with a thin black tube at the detector, reducing the effect of sunlight to a fraction. Incidentally I recently bought a PIR detector with a "walk test" before it would arm itself. It refused to arm itself, because it mistook leaves moving in the sun for the walk test ...
On the low price Level could be usefull some
pressure mats or vibration detectors
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