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measuring ball spin

Discussion in 'Electronic Design' started by bob, Jan 10, 2006.

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  1. bob

    bob Guest

    Can anyone help me with this conundrum:

    I've built a wall that measures how hard a golfball hits it. This
    force measurement is converted into a distance measurement, so I can
    gauge how far my golfball would have traveled. It is useful to me as a
    golfer. However, it would be far more beneficial if I could measure
    the ball spin at impact. This would tell me if I have hit a slice,
    hook, block, etc.

    The ball impacts 3"memory foam. What can be used to measure the ball's
    spin? Some type of embedded wire grid? HELP, Thank you, Bob
  2. Tim Wescott

    Tim Wescott Guest

    1. Figure out what ball spin does to the foam.
    2. Measure it.
    3. Compute ball spin.
  3. cbm5

    cbm5 Guest

    Figure out what causes spin and measure that. In other words, measure at
    the tee. In fact you can do away with the wall if you can measure enough
    parameters at the tee. Besides needing something to catch the ball, that is.
  4. Does it have to be a regulation golfball or can you paint (or otherwise
    mark) the surface?
  5. Ross Herbert

    Ross Herbert Guest

    Tony Course
    has invented a device which appears that it might do what you want.
    While initially developed as a ball game simulator for Australian
    Football, it should be adaptable to other ball sports. Essentially,
    the device tracks the ball from impact point and at a certain distance
    the ball is stopped by a net. The virtual path of the ball is computed
    and a result is posted.

    You can see a demo video here
  6. Thats what I was thinking. Perhaps a CCD and some tricky math stuff
    done on a PC?
  7. Paul Mathews

    Paul Mathews Guest

    Provided that there is a good coefficient of friction between the ball
    and the foam, and provided that the foam is not too energy absorptive,
    some significant amount of the ball's angular momentum will be
    converted to axial acceleration of the foam. If the foam is mounted to
    some compliant suspension system, then accelerometers on the substrate
    behind the foam will provide signals proportional to spin.
    Paul Mathews
  8. Rich Grise

    Rich Grise Guest

    Make the surface harder, so that the ball rebounds, then take the speed
    of the ball and the rebound angle, (and the coefficient of friction)
    and you should be able to calculate the spin. You might want to wear
    goggles. ;-)

    Good Luck!
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