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Ultrasonic Sensors

Discussion in 'Electronic Design' started by [email protected], May 13, 2006.

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  1. Guest

    My need is to monitor the perimeter of an outdoor area.
    I am considering ultrasonic sensors to act as an intrusion monitor.
    They need to be mounted near ground level.

    I need a device similar to what I see on upper-priced automobiles that
    indicate the presence of items around its perimeter.
    I have seen a very nice system on the bumper of a BMW that works
    extremely well to indicate a person walking around the vehicle.

    The sensor must be designed for outdoor/external applications.

    There will be a series of sensors with patterns that overlap to provide
    detection around the entire perimeter.
    They will all be wired to a controller that will sound an alarm when
    the perimeter has been entered.

    Perimeter size can vary from one hundred to several hundred feet.

    Since they will be used outdoors, what will the issues be?

    Therefore, I am looking for low-power, reliable sensors and the
    suggested controller to manage the system.

    Naturally, total price of the system will be a dominant factor.
  2. Anything else before we all run around looking for you ?
  3. Pooh Bear

    Pooh Bear Guest

    He didn't actually say it but I suspect he'd like a schematic too.

  4. Fred Bloggs

    Fred Bloggs Guest

    My need is to monitor the perimeter of an outdoor area.
  5. Joerg

    Joerg Guest

    Cats, dogs, bats, birds, tree frogs, moths, bees, bumble-bees, spiders,
    big old fat spiders, leaves, dust, pollen accumulation, rain, hail, snow ...

    Regards, Joerg
  6. Jim Thompson

    Jim Thompson Guest

    I did some ultrasonic motion detector work many years ago. Curtains
    moving when the A/C comes on would trip it :-(

    ...Jim Thompson
  7. Joerg

    Joerg Guest

    Hello Jim,
    I make most of my living off ultrasound. You really have to know the
    properties and behavior of the medium and the targets. I remember when I
    was asked to check out a Doppler that was repeatedly falling from grace
    in the clinics. I found that it didn't have any dynamic range to write
    home about. So I told the engineers about wall echoes and that those can
    be 40dB or more above the desired signal in a patient with bad plaque.
    "Aw, s..t!".

    Then we designed a new Doppler. Sans Gilbert cell mixers...

    Regards, Joerg
  8. A vehicle fan can take out most ultrasonic sensors for several hundred feet.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  9. Luhan

    Luhan Guest

    Since you wish to monitor the perimeter, not the area within it, I
    would go with pairs of modulated IR emitter/detectors at the corners.

  10. Guest

    Don't forget wind -- certain air currents, especially including
    thermal gradients, give nifty drifty ultrasound returns just like those
    from targets.

    Lightning, or, actually, thunder, might be interesting too.

    James Arthur
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