Re: Movement/Vibration Detection

On 8 Jan 2009 07:51:08 GMT, Jasen Betts <jasen@xxxxxxxxxx> wrote:

On 2009-01-08, ceebee <craig.blair@xxxxxxxxx> wrote:
I am looking for a way to detect movement/vibration around a specific
area, using some type of sensor(s) that are buried under the ground.
I would like this sensor to activate an alarm when there is vibration
around it - such as digging, or vehicles driving, etc.

I have heard of sensors for house alarms that are buried in the ground
surrounding the house - could that be applicable? I thought about
seismographic equipment, but that might used for too big of a scale.

If anyone has information regarding this, or could point me in the
right direction, it would be appreciated.

bury a multimode optic fibre. shine a laser in one end, put a video camera,
(or wiimote light-source sensor) at the output end look for changes.


Since the OP is gmail and therefore blocked...

Is it important to reject false positives from sources outside the
perimeter you are protecting? Do you need to detect non-metallic as
well as metallic 'signals'.

If only metallic then there are lot's of wire loop detectors
available.

If non-metallic perimeter detection is necessary, then a double fluid
tube system would work, however such systems are more complex and
frequently require maintenance.

If you are only interested in area detection, and not perimeter
protection, then a geophone system would work just fine.

.

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