technical help to select a distance sensor for fast moving objects

Discussion in 'The Projects Forum' started by Captain_Mainwaring, Nov 27, 2013.

  1. Captain_Mainwaring

    Thread Starter New Member

    Sep 5, 2013
    5
    0
    Hi all,

    I am looking some technical help to select a distance sensor that can measure the distance of a soccer ball in a controlled indoor environment. I need a sensor that will be able to tell me what height a soccer ball passed over at when kicked from a few feet away. Soccer balls travel at up to 35mph, can anyone recommend an Infrared or ultrasonic sensor that could "see" the ball in this short time and measure its distance???

    Ta
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,101
    3,036
    Slo-mo replay of video, if you can wait for the analysis. Do you need real-time output?
     
    Captain_Mainwaring likes this.
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    Please clarify your intent..
    Do you only need the height from the ground at a set point?
    Or some distance from something?

    Then what sort of accuracy do you require?
     
    Captain_Mainwaring likes this.
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    As wayne mentioned the simplest is to just record it with a camera and have the ball go past a tape measure.

    Other solutions would require mounting on the floor or ceiling and then sensing distance from the ball as it passes over or under the sensor.. Now this also assumes you can kick the ball in the same vertical plane as the sensor is reading in...
     
    Captain_Mainwaring likes this.
  5. Captain_Mainwaring

    Thread Starter New Member

    Sep 5, 2013
    5
    0
    I would need the reading in real time. I wish to measure the height above the floor at which the ball passes, the height will typically be in the range of 0.5m - 2m, mostly at 1m if they are any good at kicking a ball. Accuracy is in the range of +- 0.1m. The kicker will always kick in the same direction (otherwise the kick is nulled) so I only need to find the height from the floor at a fixed distance (1.5m) from the kicking spot. I assume the biggest problem is finding a sensor that can detect and measure a ball whizzing past at such high speeds!
     
  6. sirch2

    Well-Known Member

    Jan 21, 2013
    1,008
    351
    I get 35 mph to be roughly 15.5m/s and at a guess I'd say a soccer ball is somewhere between 0.25 and 0.3m in diameter. This gives a transit time of 0.016s (16ms) over a point.

    Some kind of broken beam detector comes to mind
     
Loading...