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# Determining where a ball hits a target

#### thezaxis (UID: 1122601) writes | more than 6 years ago

4

thezaxis writes "I am looking for a technology or some ideas on how to go about determining (electronically) where a weighted tennis ball hits a 2 dimensional target (wall for arguments sake). The position would need to be determined within a diameter of about 50 to 100mm. This should ideally be via optical, laser or similar method rather than electromechanical sensors to eliminate wear or damage from continuous impact of the balls. The entire target area would typically be in the order of 5m x 5m."

### Time for pencil and paper (1)

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#### justacec (UID: 1107667) | more than 6 years ago

A lot goes into this. How big is the ball, is air resistance going to be a factor, is the ball spinning, how heavy is the ball, what velocity is it being projected at, how far must it go before it hits the wall? One thing you could do is just shoot the ball about 10 times and mark where the ball hit and then adjust the laser to point there. If you are looking at predictive power with a changing setup you will of course need to develop a physical model. Look into books on computational physics for this. Obviously gravity is your dominant force here, so the standard equations of one-dimensional motion might do just fine, but if these other effects are large then a more complex model will have to be devised.

### Re:Time for pencil and paper (0)

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#### Anonymous Coward | more than 6 years ago

Methinks you didn't read the post.

### Microphones? (1)

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#### mdsolar (UID: 1045926) | more than 6 years ago

Seems to me you should be able to use time delay of the sound of impact to locate where the balls hit. This would be similar to finding snipers using three or so microphones.
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