Re: motion sensors

[Scott Goelzer <sgoelzer@EARTHLINK.NET>]

on 1/11/02 9:28 AM, Carl E. Mungan at mungan@USNA.EDU wrote:

snip



> 3. Dan recommends adding a "sail" or "flag" reflector to the carts to
> improve return signals. I'm a bit worried about air drag - how large
> a flag is optimal?
snip
> There are probably other good questions about using the sensors. I'd
> be interested in hearing tricks and tips from others. Carl
> --
> Carl E. Mungan, Asst. Prof. of Physics  410-293-6680 (O) -3729 (F)
> U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5026
> mungan@usna.edu    http://physics.usna.edu/physics/faculty/mungan/


Instead of a sail or flag on the object,
cut the corner off a box
(three triangles joined to make right angles - I cut mine about 10 cm each
side) and make a cheap retroreflector. This always gives me _great_ low
noise results and maybe less air resistence.

Scott


*****************************
S.Goelzer
Physics Teacher
Coe - Brown Northwood Academy
Northwood NH 03261
603-942-5531 ext43
sgoelzer@coebrownacademy.com
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