On Thursday, September 29, 2016 at 7:01:38 PM UTC-4, Craig Funston wrote:
We're getting closer. A fist size LIDAR for $250...

Craig - There are lots of small low-cost Lidar units, but they are
for relatively short-range detection of a solid. I've played with
a hockey-puck size unit in an indoor-mapping application.
But, these are nNot long-range particle motion as already demonstrated
for remote thermal detection ;-)

See ya, Dave