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Has a Light Plane sensor been invented?

  1. Feb 10, 2004 #1
    Has a "Light Plane" sensor been invented?

    Hi,

    Does a "Light Plane" exist or has one been invented? What I need is a light beam sensor that acts on a plane, showing a difference in voltage if any part is blocked or interferred with.


    I'm a college student trying to come up with ways to accurately measure the speed of a ball before & after it has bounced, to calculate the change in kenetic energy. The problem is with a traditional light beam, the readings are only accurate if they go right through the very centre of the ball.

    Any thoughts?

    Nick.
     
  2. jcsd
  3. Feb 10, 2004 #2

    chroot

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    You could use several independent photodetectors in an array, with one conical light source illuminating all of them.

    You could use a photovoltaic cell, and measure the current it is producing.

    You could use a CCD chip.

    - Warren
     
  4. Feb 10, 2004 #3

    chroot

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    As far as measuring speed, have you considered using ultrasound or radar?

    - Warren
     
  5. Feb 10, 2004 #4

    Integral

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    Do a search on LIGHT CURTAIN. These are relatively common in industry, generally used as safety barriers. Break the "light curtain" shut the equipment down.

    I believe that they are simply an array of photo sensors and LEDs.

    Edit:

    I googled it for you this is Banner there are other manufactures as well.

    How much $$$ are you willing to spend.
     
    Last edited: Feb 10, 2004
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