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'[PICLIST] [EE} Pressure sensors in lawn'
2001\05\07@171022 by Peter Grey

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I have been reading about the pressure sensors but has anyone got a
suggestion for sensors that will detect if a vehicle is running across a
lawn or park. It need not pick up something light such as a dog or cat.

TIA,



Peter

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2001\05\07@173552 by Dal Wheeler

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----- Original Message -----
From: Peter Grey <spam_OUTmartechTakeThisOuTspamOZEMAIL.COM.AU>


> I have been reading about the pressure sensors but has anyone got a
> suggestion for sensors that will detect if a vehicle is running across a
> lawn or park. It need not pick up something light such as a dog or cat.

Dig a moat around the place and monitor the water level for an raise when a
car falls into it.  :)

Actually, I've been looking for something similar, right now I've got an
infrared detector over the front yard --results are still not satisfactory.

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2001\05\07@180804 by Bob Ammerman

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I would expect a line sensor would make more sense than an area sensor here.
Perhaps a huge buried loop of wire as an element in an oscillator which
would be detuned by the mass of an automobile crossing the loop.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\05\08@005637 by Brooke Clarke

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Hello Peter:

It sounds like you want to detect metallic objects and reject animals.

The military does this using a magnetic field sensor, the sensor is
looking for changes in the Earth's field.

See my sensors page at:
www.pacificsites.com/~brooke/Sensors.shtml
for a lot of magnetic sensors and at my outdoor intrusion detectors page
at:
www.pacificsites.com/~brooke/GSQ160/ID.shtml
for some military sensors.

Have Fun,

Brooke

I have been reading about the pressure sensors but has anyone got a
suggestion for sensors that will detect if a vehicle is running across a

lawn or park. It need not pick up something light such as a dog or cat.

TIA,



Peter

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2001\05\08@015153 by Peter Grey

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At 15:32 7/05/01 -0600, you wrote:

This is to detect vandalism when vehicles break into a park and skid all
over the place wrecking the park for the general public. This expanse can
be 100-500 metres across. I want to minimise installation cost and use
something simple, but effective. I like the moat idea but what about the
crocodiles! No need to detect rise in water levels.

Peter
>{Original Message removed}

2001\05\08@024421 by alshinn

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I have heard that a buried water hose filled with water with some sort
of microphone  (or preassure sensor?) can detect vibrations of something
near or over it.
--
Looking forward:
Alan Shinn


Experience the
beginnings of microscopy.
Make your own replica
of one of Antony van Leeuwenhoek's microscopes.
visit    http://www.sirius.com/~alshinn/


Subject:
       Re: [EE} Pressure sensors in lawn
  Date:
       Tue, 8 May 2001 05:02:12 +1000
 From:
       Peter Grey <.....martechKILLspamspam@spam@OZEMAIL.COM.AU>


>I have been reading about the pressure sensors but has anyone got a
suggestion for sensors that will detect if a vehicle is running across a
lawn or park. It need not pick up something light such as a dog or cat.

>TIA,

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2001\05\08@050713 by o-8859-1?Q?K=FCbek_Tony?=

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Hi,
Philips makes mangnetic field measuring devices.
They claim it's capable ( sencitive enough ) to actually
determine if an object above is an bicycle or car ( when
buried into the ground ), and even general size of car.
I also think that one application was for vehicle detection
at toll booths.
Think it was KMZ52 and the likes, Magnetic Field Sensors.
Check it out.

/Tony



Tony Kübek, Flintab AB            
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"No! Try not. Do, or do not. There is no try.", Yoda
E-mail: tony.kubekspamKILLspamflintab.com
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2001\05\08@161305 by Russell McMahon

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1.    IR laser beams  should give you longish distance detection with not
many sensors. Add a little bit of intelligence re beam interruption periods
and time between interruptions and you should be able to make a reasonable
guess as to size and speed of object concerned. A car will be fastish and
largish and interruptions will be correlated to a reasonable degree.

2.    Should be possible to install a series of inductive loop sensors along
the field perimeter or at selected spots in the grass surface proper. These
are as simple as buried multi-turn loops (see traffic light vehicle
sensors). These can be made sensitive to any desired size of metal only. eg
a pushbike would not set one off but a car would.

3.    Vehicle speed and size are probably a fair discriminator. Doppler
radar may suffice. Available, not too dear, cover large area. Discriminating
animals may be difficult. if you have a very enthusiastic dog etc :-)







     Russell McMahon
_____________________________



> I have been reading about the pressure sensors but has anyone got a
> suggestion for sensors that will detect if a vehicle is running across a
>
> lawn or park. It need not pick up something light such as a dog or cat.
>
> TIA,

> Peter

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2001\05\08@190719 by Peter L. Peres

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> I have been reading about the pressure sensors but has anyone got a
> suggestion for sensors that will detect if a vehicle is running across a
> lawn or park. It need not pick up something light such as a dog or cat.
>
> TIA,
>
> Peter

A surplus antivehicle mine ? ;-)

just being funny,

Peter

PS: Try piezo cable or pneumatic cable. Or geophones. Or metal detector
coils (buried). Good luck with the budget & work & maintenance for a
larger area.

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2001\05\09@091930 by Patrick J

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Hi, some time back I saw a TV show about burglaralarms.

They used several fiberoptics-cables buried in the lawn. It could detect
ppl walking on the lawn. It had something to do with interference in the
reflected waveforms for the laserlight (Atleast I think it was laser, this was 7-10 years ago)

/P

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2001\05\09@201246 by miked

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Here is a commerical remote unit from JC Whitney for detecting cars.
http://www.jcwhitney.com/product.jhtml?CATID=139857

>
> I have been reading about the pressure sensors but has anyone got a
> suggestion for sensors that will detect if a vehicle is running across a
>
> lawn or park. It need not pick up something light such as a dog or cat.
>
> TIA,
>
>
>
> Peter
>

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