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Of course, the big guns have already spoken:
http://www7440.nrlssc.navy.mil/littoral%20dynamics/piv.html

You might try looking at TSI & Dantec on the web.  Particle image velocimetry has been around a while in commercial form.

Reagan Cole
durham,nc

-----Original Message-----
>From: Eric Yuan <[log in to unmask]>
>Sent: Apr 13, 2007 9:04 AM
>To: [log in to unmask]
>Subject: Re: Radar guns
>
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>Stuart, great idea! 
>The sand could be set against a graphic that shows the paths of travel at
>different launch speeds.  Next to the sand, add a stream of water to compare
>the path of particles with that of a fluid.
> 
>As for measuring the speed of a steel ball, mount two light sensors a known
>distance apart.  Measure the time as the ball blocks one light sensor, then
>the other.  A common setup for high school physics experiments.  
>
>-Eric
> 
>
>*****************************************
>Eric Yuan
>Exhibit Developer
>Children's Museum of Portsmouth
>280 Marcy Street
>Portsmouth, NH 03801
>(603) 436-3853
>www.childrens-museum.org 
>*****************************************
>
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