Hi Mr. King,

I think that the major problem is what sensor to use instead of
what amplifier use.
Geophones have a limited detection range and not detect a person
that eventually walk softly.
It could detect a running animal instead or an animal trying to bury
something near the sensor.
Probably a better sensor is a pressurized rubber pipe buried along the =
border
that could be long 10 - 20 meters or more.
Then you can measure the pressure variation at one extremity when
someone walk over it.

Just an idea...

regards
Mauro

  ----- Original Message -----=20
  From: Michael King=20
  To: PSN-L@.................
  Sent: Wednesday, April 09, 2003 12:09 AM
  Subject: Intrusion Sensors


  I am designing intrusion sensors to detect people entering the country =
illegally in southern AZ. I am the technical director of the American =
Border Patrol.  Some of yo may have heard of us.  I am looking for a =
good circuit that uses very little power and has little noise but =
amplifies alot.  If anyone can help me it would be appreciated and you =
would be helping our country guard it's borders.


  Michael S. King
  Technical Director







Hi Mr. King,
 
I think that the major problem is what =
sensor to=20
use instead of
what amplifier use.
Geophones have a limited detection =
range and not=20
detect a person
that eventually walk =
softly.
It could detect a running animal =
instead or an=20
animal trying to bury
something near the sensor.
Probably a better sensor is a =
pressurized rubber=20
pipe buried along the border
that could be long 10 - 20 meters or=20
more.
Then you can measure the pressure =
variation at one=20
extremity when
someone walk over it.
 
Just an idea...
 
regards
Mauro
 

  
----- Original Message ----- 
  From:=20
  Michael King 
  
To: PSN-L@.............. 
  
Sent: Wednesday, April 09, 2003 =
12:09=20
  AM
  
Subject: Intrusion =
Sensors
  


  
I am designing intrusion sensors to =
detect people=20
  entering the country illegally in southern AZ. I am the technical =

  director of the American Border Patrol.  Some of yo may have =
heard of=20
  us.  I am looking for a good circuit that uses very little power =
and has=20
  little noise but amplifies alot.  If anyone can help me it =
would be=20
  appreciated and you would be helping our country guard it's=20
  borders.
  
 
  
 
  
Michael S. King
Technical =
Director
American=20
  Border Patrol