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Electronic Distance Measurement

Discussion in 'General Electronics' started by Kevin C., Feb 19, 2004.

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  1. Kevin C.

    Kevin C. Guest

    I'm looking for some information on the precision/accuracy of
    infrared, laser, and ultrasonic sensors.

    In one application, I'm looking to measure a distance 50-70 inches
    to an accuracy of 1/16".

    In a second application I'm looking to measure a distance of 0-8"
    to within 0.005" This is very similar to what "digital calipers"
    are capable of, but I'm curious as to how they work.

    Any help/ideas/pointers are appreciated.

  2. Robert Baer

    Robert Baer Guest

    Start with the accuracy as defining the longest wavelength and i would
    think divide by four. Determine the lowest frequency needed based on the
    method (RF or sound).
    Next, take the shortest range as defining (half of the) the travel
    time based on the method (RF or sound). Again, i would think divide by
    With these number pairs, one method would most likely stand out as
    being the most practical with parts and expertise on hand.
  3. Pelin

    Pelin Guest

    Try searching for laser sound surveillance equipment, which picks up
    vibrations of the glass window and transforms it to sound. Basically it
    measures distance with such resolution that you require.
  4. Guest

    These devices don't measure absolute distance.
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