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Speed measurement help

Discussion in 'General Electronics' started by Yen Pham, Aug 25, 2003.

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  1. Yen Pham

    Yen Pham Guest


    Can someone points me in the right direction with this problem. I need to
    buy a calibrated device that can measure the speed of an object to within
    +/-1%. The object is fairly small at about 3" diameter and moving at about
    150mph in a known path. Is there something like a calibrated laser speed
    trap that I can buy from somewhere that will give me these measurements? We
    don't really have time to engineer something at the moment, so an off the
    shelf solution would be perfect. Your assistance is greatly appreciated.

  2. If you don't have time to engineer, why would you expect someone else, who
    is not a vendor, to do it for you. If I knew, without search or effort where
    you could get one, I might happily let you know. If I did that kind of
    consulting for a living, I would quote you a price. But I do not.

  3. Louis Boyd

    Louis Boyd Guest

    This uses microwaves rather than lasers but it looks like it will do
    what you want quite nicely.

    Accuracy ± 0.1 MPH
    Speed Range 1-300 MPH
    Target Acquisition Time 0.01 Seconds
    Microwave System Ka Band, 20 mw
    Weight 3.2 Pounds
    Data Output TTL and RS-232
    Output Sample Rate 31.25 Per Second
    Display Units MPH, KPH and Knots
    Estimated Range (baseball) 450 feet
    Price $2500.
  4. Ghost Chip

    Ghost Chip Guest

  5. Opto

    Opto Guest

    For pete's sake, lay off the guy, would you? People ask for vendor
    recommendations quite often on newsgroups. You need to learn to relax
    a little bit.
  6. Fred Bloggs

    Fred Bloggs Guest

    Also from the same manufacturer:
    "Many may not understand why radar performance and clocking distance is
    so important. To get correct readings, a radar needs to be placed in the
    line of travel of objects (it cannot clock objects at angles or as they
    go by). In the real world, the radar gun needs to be placed far away
    from the target. That is why Stalkers are designed to provide
    extraordinarily long clocking range. "

    So that 1% accuracy implies cos(a)>=0.99 or less than 8 degrees
    deviation from velocity angle.
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