Become a fan of Slashdot on Facebook

typodupeerror

## + - Determining where a ball hits a target4

Submitted by thezaxis
thezaxis (1122601) 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."
This discussion was created for logged-in users only, but now has been archived. No new comments can be posted.

## Determining where a ball hits a target

• #### Time for pencil and paper (Score:1)

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.
• #### You've obviously not been watching the cricket... (Score:2)

"Hot Spot" sounds exactly what you're looking for. Here's a Sky ad and a blog with a bit of info:

http://uk.cricinfo.com/db/NATIONAL/ENG/sky_sports. html [cricinfo.com]
http://www.miodestino.co.uk/blog/2007/05/17/sky-sp orts-with-spot-on-coverage/ [miodestino.co.uk]
• #### Microphones? (Score:2)

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.
--
Watch the Sun transit with you solar power array: http://mdsolar.blogspot.com/2007/01/slashdot-users -selling-solar.html [blogspot.com]

The IQ of the group is the lowest IQ of a member of the group divided by the number of people in the group.

Working...