Re: Ultrasonic Sensors

["Robert L Bass" <robertlbass@xxxxxxxxxxx>]

>I would be monitoring outdoor landscaped areas. They could contain
> ponds, waterfalls, ...
> They will vary in size and shape so there is no well-defined perimeter
> that is consistent from one installation to the next. The perimeter
> will more often than not be finished with stone or concrete rather than
> natural grass and soil.
>
> Infra red barriers would be an option if the shape of the perimeter was
> symmetrical but it will often not be that way.
>
> Per my previous post, I was thinking of trying ultrasonics mounted at
> the perimeter of the inner circle, pointing toward the outer circle. I
> would have to space them close enough so their sensing patterns overlap
> to guard the entire perimeter.


You might also consider seismic sensors.  These can be buried in concentric
circles (or whatever shapes you like) around protected areas.  You can
define how to respond to an outer circle violation differently from the
inner circle with some systems.  These systems are not cheap but they do
offer a good deal of flexibility, perhaps more than most surface mounted
technologies.  They have the added benefit of being totally invisible and
undetectable to the intruder.

--

Regards,
Robert L Bass

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