> I need to determine the position of a instrument with a 1mm accuracy or less. > The instrument is not connected to a mechanical device but is separate & > independent. > The surface which the instrument is positioned on is close to the size of a > 11"x11" square.
1 mm or better accuracy on a 300x300 mm surface can be obtained with a cheap webcam mounted above the surface and a little bit a creative software. > Obviously this is used to triangulate the position of the instrument. > Light travels 1 mm in ~3.3 picoseconds so I would suspect the differentiator > would have to have that or better resolution. Sound travels about a million times slower than light. 343 m/s is 1 mm in 2.9 microseconds. Perhaps this is the way to go? I remind visitors here that a WWV tick takes the same time to travel from Ft Collins to Seattle as it does to travel from the SW radio speaker to your ear. /tvb _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
