Tom Van Baak wrote: > A Measurement of the Period Stability of a Free Pendulum > http://www.leapsecond.com/history/1996-DeMarchi-Pendulum-Stability.pdf > > Clever solution. His optical gap is something like 5 microns. > > /tvb > > An additional issue is the pointing instability of the laser used.
A position sensitive detector (lateral-effect photodiode sensor) for which the output is independent of the beam flux could be used however the noise and drift (typically <=1um/C) may be an issue. Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
