Re: Ultrasonic Sensors

["Tommy" <tommy at leesecurity dot net>]

I agree. "Walk away" unless he has plenty of money,patience,willing to
experiment, and dosen't worry about false alarms;)

Stanley Barthfarkle wrote:

>
> > 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.
>
>
>
> That's going to be a tough one. Never heard of a product that was
> designed for what you are trying to do. The automobile backup sensors
> have never been used for security purposes that I'm aware of. Once
> upon a time, ultrasonic volumetric sensors were used INDOORS for
> space protection- quite unreliably, I might add.
>
> The key here is that you're trying to protect a narrow, curving strip
> of perimeter area, and don't want any gaps. (in other words, spot
> protection won't work) A reliable technology that provides proper
> catch performance while eliminating false alarms in an outdoor area
> is going to be quite a feat. If someone comes up with a viable, real
> world solution, and not just an idea on paper, I'd love to hear about
> how they did it.



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